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Phase 2 trial

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Challenges SOC

TREASURE NCT04462276

ForES-SCLC, ≥stable disease after chemo-IO induction; unselected

Overall survival

6.7 vs 13.4 mo

HR 1.55 (95% CI 0.90-2.69), P=.34; TRT arm worse, ns

TL;DRmOS 6.7 vs 13.4mo (HR 1.55, ns) adding consolidative TRT to atezo maintenance; halted early for SAEs 61% vs 18%.

Why it mattersRadiation oncology

The harm, not the null OS, is the RT read: SAEs 61% vs 18%, fatal AEs 19% vs 3%, driven by post-TRT lymphocyte depletion and low baseline DLCO in the fatal cases. 30Gy/10fx consolidative TRT on atezo maintenance is net harmful in unselected ES-SCLC; any future use needs lung-function gating.

6 details 1 trial watching

Phase 2 open-label RCT (AIO-TRK-0320), 1:1, 20 sites in Germany/Austria. Planned 104 pts; halted early by the SMC after 68 randomized (34/arm) for excess fatal SAEs in the TRT arm. Recruited 2020-2022, last follow-up Sept 2024, post-hoc survival update April 2026.

ES-SCLC with at least stable disease after induction carboplatin-etoposide-atezolizumab. Baseline well balanced between arms and between pts with vs without SAEs. Unselected for lung function.

Consolidative TRT 30 Gy in 10 fractions added to atezolizumab maintenance (arm A) vs atezolizumab maintenance alone (arm B).

Primary: overall survival. Secondary included PFS and safety.

Primary OS not met: the TRT arm was numerically worse with no PFS difference and sharply higher serious and fatal toxicity (see table).

Endpoint+TRT (arm A)Atezo alone (arm B)Effect
mOS6.7 mo (5.1-9.0)13.4 mo (10.7-17.5)HR 1.55 (0.90-2.69), P=.34
mPFS2.4 mo (1.3-3.9)2.6 mo (1.2-3.9)HR 0.92 (0.54-1.55), P=.85
SAEs61.3%18.2%P<.001
Fatal AEs19.4%3.0%P=.04

SAEs dominated by infection and respiratory disorders, linked to radiation-induced lymphocyte depletion; fatal-AE pts in arm A had lower baseline DLCO. No other risk factors identified.

CREST (pre-immunotherapy) showed a modest OS benefit from thoracic RT after chemo; TREASURE tested that strategy on an IMpower133-style IO-maintenance backbone and found harm, not benefit.

unselected ES-SCLC pts with at least stable disease after chemo-immunotherapy induction
Does not represent lung-function-selected pts or those with poor baseline DLCO, in whom TRT was not separately tested.

Open-label; small N (68) and early termination leave OS underpowered with a wide CI. Phase 2; efficacy conclusions provisional, though the safety signal is robust.

Randomised harm signal (SAEs 61% vs 18%, fatal 19% vs 3%) argues against adding consolidative TRT to IO maintenance, contesting emerging RT enthusiasm; OS worse but underpowered by early stop.

In unselected ES-SCLC with at least stable disease after chemo-IO induction, this evidence argues against routinely adding consolidative thoracic RT to atezolizumab maintenance; it does not address the good-lung-function subset the authors flag as possibly selectable.

📚 Sources · 📄 1 paper
📄 PAPER Bozorgmehr, Farastuk; Chung, Inn; Behnisch, Rouven et al. · JAMA Oncology (2026-07)
Consolidative Thoracic Radiotherapy With Atezolizumab Maintenance in Extensive-Stage Small Cell Lung Cancer
Abstract
Importance Chemoimmunotherapy followed by immunotherapy maintenance is the standard first-line treatment for extensive-stage small cell lung cancer (ES-SCLC), yet data regarding efficacy and safety of consolidative thoracic radiotherapy (TRT) are lacking. Objective To determine whether combining consolidative TRT with immunotherapy maintenance in ES-SCLC is safe and improves patients’ overall survival (OS) and progression-free survival (PFS). Design, Settings, and Participants This was a multicenter open-label phase 2 randomized clinical trial recruiting patients from September 2020 to August 2022 in Germany and Austria, with the last follow-up visit in September 2024. Eligible patients had ES-SCLC with at least stable disease after induction chemoimmunotherapy (carboplatin−etoposide−atezolizumab). Although the database was locked in April 2025, a post hoc survival update was performed in April 2026. Data were analyzed from April 2025 to April 2026. Interventions Randomized (1:1) to either atezolizumab maintenance combined with consolidative TRT (30 Gy in 10 fractions) (arm A) or atezolizumab maintenance alone (arm B). Main Outcome and Measure OS (time from randomization to death due to any cause). Results Of 96 patients assessed for eligibility, 68 patients were randomized; recruitment was prematurely terminated due to safety concerns. Median OS in the combination arm was numerically shorter compared to atezolizumab only (6.7 months [95% CI, 5.1-9.0] vs 13.4 months [95% CI, 10.7-17.5]; HR, 1.55 [95% CI, 0.90-2.69]; P = .34), while median PFS was similar (2.4 months [95% CI, 1.3-3.9] vs 2.6 months [95% CI, 1.2-3.9]; HR, 0.92 [95% CI, 0.54-1.55]; P = .85). TRT plus atezolizumab was accompanied by higher frequency of severe adverse events (SAEs) (19 patients [61.3%] vs 6 patients [18.2%]; P &amp;amp;lt; .001) and fatal outcomes (6 patients [19.4%] vs 1 patient [3.0%]; P = .04). Safety analysis revealed predominance of infection and respiratory disorder−related SAEs, possibly facilitated by a depletion of lymphocytes observed specifically in patients after TRT, and by a lower single breath diffuse capacity of the lungs for carbon monoxide in patients with fatal AEs in arm A. No further risk factors were identified, given that baseline characteristics were well balanced between both arms and between patients with and without SAEs, including fatal SAEs. Conclusions and Relevance In this randomized clinical trial, TRT combined with immunotherapy increased toxic effects in unselected patients with ES-SCLC without survival benefit, presumably due to radiation-induced lymphocyte depletion facilitating infections. Cautious patient selection and further investigation to identify those who may benefit without undue risk are required. Trial Registration ClinicalTrials.gov Identifier: NCT04462276
Early signal

10-yr SBRT for Prostate Cancer (Meier Nonrandomized Trial)

ForLow- and intermediate-risk localized prostate, no ADT, Gleason ≤7, PSA ≤20

TL;DR10-yr OS 84%, RFS 90% (94% LR, 86% IR); late G3 GU/GI ≤1.5%, no G4-5; 40Gy/5fx SBRT, no ADT, 21 centers

Why it mattersRadiation oncology

The unfavorable-IR subgroup is the read: 10-yr RFS 77% vs 92% favorable-IR, so SBRT monotherapy without ADT looks adequate for LR/favorable-IR but leaves unfavorable-IR pts short. 40Gy/5fx transfers directly to practice. Late GU G2+ 14% (vs GI 2.1%) is the toxicity to counsel.

9 details 4 trials watching

Investigator-initiated phase 2 nonrandomized single-arm trial, N=310 evaluable across 21 community, regional and academic centers, treated 2008-2010. Median follow-up 9 yr; 10-yr Kaplan-Meier estimates.

172 low-risk (T1b-T2a, Gleason 6, PSA ≤10) and 138 intermediate-risk (Gleason 7 with PSA ≤10, or Gleason 6 with PSA 10-20), central path review. Median age 68; prostate volume up to 100 cc; ADT not allowed.

40 Gy in 5 fractions (8 Gy×5) on a noncoplanar robotic platform with real-time motion management, dose escalated to ~100 Gy EQD2 (α/β=2).

10-yr OS 84% and overall RFS 90%; risk-group and favorable/unfavorable IR breakdown in the results table. Relapse defined as biochemical failure (nadir+2), clinical failure, or salvage/systemic therapy.

Subgroup10-yr RFS
Overall90%
Low-risk94%
Intermediate-risk86%
Favorable IR92%
Unfavorable IR77%

Late G3 GI/GU 1.4% LR, 1.5% IR; no grade 4-5. G2+ GI 2.1% vs GU 14%, the dominant late burden. Physician-reported CTCAE v3.

PACE-B showed SBRT noninferior to conventional EBRT at 5 yr; this extends single-arm SBRT durability to 10 yr, consistent with the cohort's prior 5-yr low-toxicity report.

low- and intermediate-risk organ-confined prostate cancer treated with SBRT without ADT
Does not represent high-risk, node-positive, or ADT-combined disease.

Single-arm, no randomized comparator; toxicity is physician-reported (CTCAE v3), not patient-reported, so late GU burden may be understated; RFS folds salvage/systemic therapy into the relapse endpoint.

Single-arm nonrandomized phase 2; no comparator arm (PACE-B provides randomized evidence). Mature 10-yr data reassure but design caps the read below confirmatory.

In low- and favorable-intermediate-risk localized prostate (Gleason ≤7, no ADT indication), this supports ultrahypofractionated SBRT as durable at 10 yr; it does not extend to high-risk or node-positive disease, where ADT and nodal coverage remain in play.

📚 Sources · 📄 1 paper
📄 PAPER Meier, Robert M.; Aghdam, Nima; Beckman, Alan C. et al. · European Urology (2026-05)
10-yr Survival and Toxicity Outcomes of Stereotactic Body Radiotherapy for Prostate Cancer: A Nonrandomized Clinical Trial
Early signal

ARTO NCT03449719

ForOligomet CRPC, ≤3 mets, no prior systemic mCRPC therapy, on abiraterone

TL;DRmOS NR vs 50mo, HR 0.55 (0.33-0.92, p=0.021) adding SBRT to all mets to abi+ADT in oligomet CRPC (unplanned OS analysis).

Why it mattersRadiation oncology

Ablative dose is the transferable read: BED ≥100 Gy in 1-5 fractions to ALL oligomet sites, and MDT added no excess grade 3-4 toxicity (the only treatment-related death was in the control arm). Extends the oligomet-MDT OS signal from hormone-sensitive disease into CRPC on an abiraterone backbone, informing whether to irradiate all sites when starting an ARSI.

Also covered Jun 12

9 details 4 trials watching

Phase 2, open-label, randomised 1:1, N=157, 16 Italian academic/community centres; stratified by centre, ECOG PS, and number of metastases. Median follow-up 53 mo (IQR 43-60). This OS read is an unplanned long-term analysis.

Prostate adenocarcinoma with metastatic castrate-resistant disease, ≤3 metastatic sites, and no prior systemic therapy for mCRPC. Control n=82, experimental n=75.

Both arms received ADT plus oral abiraterone acetate 1000 mg daily. The experimental arm added SBRT.

SBRT to all sites of metastatic disease, 1-5 fractions, biologically effective dose ≥100 Gy (ablative).

Primary: 6-month biochemical response (PSA drop ≥50%), previously met and reported. This paper reports an unplanned overall survival analysis at long-term follow-up.

OS median NR (95% CI 55-NR) experimental vs 50 mo (36-NR) control, HR 0.55 (0.33-0.92), p=0.021.

G3-4 infectious complications 5 (control) vs 0 (experimental); cardiovascular disorders 3 vs 3. One treatment-related death (myocardial failure) in the control arm. No excess toxicity from MDT.

Prior oligomet-MDT RCTs (STOMP, ORIOLE) enrolled castration-sensitive disease; ARTO extends the metastasis-directed RT signal into the CRPC setting on an ARSI backbone.

oligometastatic CRPC (≤3 sites) starting abiraterone with no prior mCRPC systemic therapy
Does not represent higher-volume mCRPC or castration-sensitive oligometastatic disease.

Unplanned OS analysis with post-hoc power recalculation; the trial was powered for 6-month biochemical response, not survival. Open-label, small N (157), phase 2.

Unplanned OS analysis (trial powered for 6-mo biochemical response, not survival); phase 2, N=157, open-label. Positive but hypothesis-generating pending a survival-powered phase 3.

In oligometastatic CRPC (≤3 sites, no prior systemic mCRPC therapy) starting abiraterone, this supports adding metastasis-directed SBRT; the signal does not extend to higher-volume mCRPC or the castration-sensitive oligomet setting.

📚 Sources · 📄 1 paper
📄 PAPER Francolini; Di Cataldo; Caini et al. · The Lancet. Oncology (2026-07)
SBRT plus abiraterone acetate and ADT versus abiraterone acetate and ADT in oligometastatic castrate-resistant prostate cancer (ARTO): long-term, unplanned overall survival analysis of an open-label, randomised, phase 2 trial.
Abstract
BACKGROUND: The ARTO trial showed improved early clinical outcomes by adding metastasis-directed therapy (MDT), through stereotactic body radiotherapy (SBRT), to abiraterone acetate and ADT in oligometastatic castrate-resistant prostate cancer. The aim of this analysis is to explore the long-term impact of MDT on overall survival.<br/><br/>METHODS: ARTO was a multicentre, phase 2, randomised trial conducted in 16 academic and community centres across Italy. All patients included were aged 18 years or older and had a diagnosis of prostate adenocarcinoma with metastatic castrate-resistant prostate cancer, no more than three metastatic sites, and no previous systemic therapy for metastatic castrate-resistant prostate cancer status. Patients were randomly assigned (1:1, using random permuted blocks; stratified by treating centre, Eastern Cooperative Oncology Group performance status, and number of metastases) in an open-label design to androgen deprivation therapy plus oral abiraterone acetate 1000 mg daily with or without SBRT to all sites of metastatic disease (one to five fractions providing a biologically effective dose &#x2265;100 Gy). The primary endpoint was 6-month biochemical response (PSA decrease of &#x2265;50% compared with baseline) and has been reported previously. After meeting its primary endpoint, the power calculation was updated post-hoc to assess overall survival, finalised before data unmasking. We present an unplanned long-term follow-up focusing on overall survival. All analyses were performed on an intention-to-treat basis. The trial is registered on ClinicalTrials.gov (NCT03449719) and is now closed.<br/><br/>FINDINGS: Between Jan 2, 2019, and Sept 7, 2022, 157 patients were randomly assigned to the control (n=82) and experimental (n=75) groups. No data about race or ethnicity were collected. After a median follow up of 53 months (IQR 43-60), median overall survival was 50 months (95% CI 36-not reached [NR]) in the control group versus NR (55-NR) in the experimental group (HR 0&#xb7;55, 95% CI 0&#xb7;33-0&#xb7;92, p=0&#xb7;021). Most common grade 3-4 adverse events recorded were infectious complications (five in the control group vs zero in the experimental group) and cardiovascular disorders (three in the control group vs three in the experimental group). One treatment-related death occurred in the control group due to myocardial failure.<br/><br/>INTERPRETATION: The ARTO trial showed significant benefit in overall survival with the addition of MDT to systemic therapy versus systemic therapy alone.<br/><br/>FUNDING: Fondazione Radioterapia Oncologica.
Early signal

INDIBLADE

ForStage II/III MIBC, cT2-4aN0-2, bladder-preservation candidates

TL;DR2yr bladder-intact EFS 78% (67-90%) with induction ipi+nivo before chemoRT; 2yr OS 96% in cT2-4aN0-2 MIBC.

Why it mattersRadiation oncology

Cohort spans cT2-4a and clinically node-positive (N1-2), pushing bladder preservation into nodal disease that usually routes to cystectomy. The novel lever is induction ipi+nivo before chemoradiation, not the RT itself; 78% 2yr bladder-intact EFS tests whether induction dual-IO belongs in a trimodality pathway. RT dose and fractionation absent from source, so transferability stays unconfirmed.

7 details 4 trials watching

Single-arm bladder-preservation trial: induction dual checkpoint blockade followed by chemoradiation. N and site count not reported in source. Outcomes reported at 2 years.

Stage II/III MIBC, cT2-4aN0-2. Notably includes clinically node-positive (N1-2) disease, a group usually routed to radical cystectomy.

Induction ipilimumab + nivolumab (dual IO) before chemoradiation. Doses, cycles, and radiosensitizing chemotherapy not stated in source.

Chemoradiation is the definitive local component, but RT dose, fractionation, and target volume are not specified in source, gating whether the result transfers to a given practice.

Headline readout is 2yr bladder-intact event-free survival; overall survival reported alongside.

cT2-4aN0-2 MIBC pursuing bladder preservation, including node-positive disease
Does not represent cT4b/M1 disease or pts unfit for chemoradiation.

Single-arm, no comparator vs chemoRT alone or cystectomy; short 2yr follow-up; bladder-intact EFS is a composite surrogate; N and RT details absent from source.

Single-arm, no comparator vs chemoRT alone or cystectomy; 2yr follow-up; bladder-intact EFS a composite surrogate. Hypothesis-generating induction-IO-plus-CRT signal, not yet mature.

In cT2-4aN0-2 MIBC weighing bladder preservation against radical cystectomy, this signals induction ipi+nivo plus chemoradiation is feasible even with node-positive disease, but single-arm 2yr data do not yet displace cystectomy or chemoRT alone off-protocol.

📚 Sources · 🐦 1 tweet
Early signal

DOREMY NCT02106312

ForLocalized translocation-confirmed myxoid liposarcoma, trunk/extremity

TL;DR5yr local recurrence-free survival 97.4% after de-escalated 36Gy/18fx preop RT in myxoid liposarcoma; wound complications 21%.

Why it mattersRadiation oncology

The RT read is dose de-escalation: 36Gy/18fx (vs the standard 50Gy/25fx) held 5yr LRFS at 97.4% in translocation-confirmed MLS, with wound complications 21% and G3 late toxicity 3%. Exploiting MLS radiosensitivity trims ~14Gy without a local-control cost, moving the preop-dose decision for this histology specifically.

7 details 4 trials watching

Phase 2 single-group nonrandomized trial, N=90, 9 tertiary sarcoma centers (Europe + US), enrolled 2010-2020. Median follow-up 66.4 mo (IQR 48.8-87.5).

Adults with biopsy-proven, translocation-confirmed localized MLS of trunk or extremity. Mean age 47, 56% male.

36 Gy in once-daily 2-Gy fractions (18 fx) preoperatively, against the standard 50 Gy/25 fx for soft-tissue sarcoma. Delivered per protocol in all 90 pts, then resection.

5yr LRFS 97.4% (95% CI 93.9-100) is the standout; PFS 81.0%, DSS 89.5%, OS 88.5% (full set in table). 3 pts (3%) progressed to metastasis before surgery.

Endpoint (5yr)Rate95% CI
Local recurrence-free survival97.4%93.9-100
Progression-free survival81.0%72.6-89.4
Disease-specific survival89.5%82.6-96.4
Overall survival88.5%81.2-95.8

Wound complications in 18 pts (21%), 14 (16%) needing intervention. Late toxicity: G2 in 13 (15%), G3 in only 3 (3%).

Standard preoperative dose for soft-tissue sarcoma is 50 Gy/25 fx. MLS is highly radiosensitive, which motivates cutting ~14 Gy to 36 Gy while preserving local control.

localized, translocation-confirmed myxoid liposarcoma of trunk or extremity
Does not represent other soft-tissue sarcoma histologies or non-translocation-confirmed disease.

Single-arm, no randomized comparator vs 50 Gy; equivalence inferred, not proven. Rare cancer makes a phase 3 impractical (authors' argument).

Single-arm nonrandomized phase 2; no randomized comparator vs standard 50Gy. Long follow-up, but efficacy equivalence is inferred, not tested. Single-arm design caps the read.

In localized, translocation-confirmed myxoid liposarcoma of the trunk or extremity, this supports reduced-dose 36Gy preop RT as an option; it does not extend to other soft-tissue sarcoma histologies that lack this radiosensitivity.

📚 Sources · 📄 1 paper
📄 PAPER Lansu; Bov&#xe9;e; Braam et al. · JAMA oncology (2026-05)
Dose Reduction of Preoperative Radiotherapy in Myxoid Liposarcoma: The Phase 2 DOREMY Nonrandomized Clinical Trial.
Abstract
IMPORTANCE: Prospective data from 2 phase 2 trials showed favorable wound complication rates and promising local control after a reduced preoperative radiotherapy dose for myxoid liposarcoma (MLS). However, long-term follow-up data are currently lacking.<br/><br/>OBJECTIVE: To determine the efficacy and toxicity profile of a reduced preoperative radiotherapy dose in patients with MLS with long-term follow-up.<br/><br/>DESIGN, SETTING, AND PARTICIPANTS: The Dose Reduction of Preoperative Radiotherapy in Myxoid Liposarcoma (DOREMY) trial is a prospective, single-group, phase 2 nonrandomized clinical trial conducted in 9 tertiary sarcoma centers in Europe and the US. Eligible patients were adults with biopsy-proven and translocation-confirmed localized MLS of the trunk or extremity who were enrolled from November 24, 2010, to May 14, 2020. Data were analyzed from January to December 2025.<br/><br/>INTERVENTION: Preoperative radiotherapy to a reduced dose of 36 Gy in once-daily 2-Gy fractions followed by resection.<br/><br/>MAIN OUTCOMES AND MEASURES: Long-term local recurrence-free survival, progression-free survival, disease-specific survival, overall survival, and late toxic effects.<br/><br/>RESULTS: Ninety patients (mean [SD] age, 47 [13.1] years; 50 [56%] male) were included and followed up for a median (IQR) of 66.4 (48.8-87.5) months. Preoperative radiotherapy was delivered according to protocol in all patients. Surgery was not performed in 3 patients (3%) due to intercurrent metastatic disease. Local recurrence-free survival, progression-free survival, disease-specific survival, and overall survival rates at 5 years were 97.4% (95% CI, 93.9%-100%), 81.0% (95% CI, 72.6%-89.4%), 89.5% (95% CI, 82.6%-96.4%), and 88.5% (95% CI, 81.2%-95.8%), respectively. In total, 18 patients (21%) experienced a wound complication, and 14 (16%) required intervention. Any grade 2 or grade 3 late toxic effects were seen among 13 patients (15%) and 3 patients (3%), respectively.<br/><br/>CONCLUSIONS AND RELEVANCE: This long-term analysis of the DOREMY nonrandomized clinical trial demonstrated excellent local control and a favorable toxicity profile following dose reduction of preoperative radiotherapy in patients with MLS. These compelling phase 2 findings support adoption of this regimen as an appropriate treatment option through shared decision-making with the patient, given the impracticality of conducting a phase 3 trial for a rare cancer.<br/><br/>TRIAL REGISTRATION: ClinicalTrials.gov Identifier: NCT02106312.
📝 42141895
Early signal

REVELUTION

ForIntermediate/high-risk non-metastatic prostate on definitive RT + ADT

Total coronary plaque volume change safety

68.9 mm³ more plaque with leuprolide vs relugolix

Adjusted for age, statin, baseline plaque; crude 56 vs 25 mm³

TL;DR68.9 mm³ greater total coronary plaque progression with leuprolide vs relugolix at 12mo (adjusted), non-metastatic prostate on RT + ADT.

Reported via UroToday →

Why it mattersRadiation oncology

The signal is non-calcified plaque: leuprolide added 68.9 mm³ more total plaque than relugolix at 12mo (adjusted), and that gap tracked the non-calcified subtype, with no significant difference in calcified or low-attenuation plaque. For a radonc co-prescribing ADT with definitive RT, it strengthens the mechanistic case for relugolix in cardiovascular-risk pts.

8 details 3 trials watching

Single-institution, open-label, parallel-cohort randomized trial (4 Emory-affiliated centers, Jun 2020-2024). ADT-eligible pts randomized 1:1 relugolix vs leuprolide, stratified by ASCVD 10-yr risk; a lower-risk radiotherapy-alone cohort ran in parallel as a no-ADT control. N=94.

Non-metastatic intermediate/high-risk prostate cancer, all receiving pelvic RT (± pelvic nodes). ADT arms received ≥6 months hormone therapy; the control cohort was lower-risk, RT-alone, with no planned ADT.

Relugolix 360mg load then 120mg daily vs leuprolide 3-month depot. Serial coronary CTA at baseline and 12mo, blinded to arm, quantified by the HeartFlow automated tool.

Primary: 12-month change in total plaque volume. Secondary: non-calcified, calcified, and low-attenuation plaque subtypes.

Adjusted mean total-plaque difference 68.9 mm³ favoring relugolix; crude 12-mo change 56 vs 25 mm³ (leuprolide vs relugolix). Excess driven by non-calcified plaque; calcified and low-attenuation subtypes showed no significant difference.

Offers a coronary-atherosclerosis mechanism for HERO (2020), where relugolix showed lower MACE than leuprolide despite similar testosterone suppression and metabolic effects.

intermediate/high-risk non-metastatic prostate pts receiving definitive RT plus ADT
Does not represent metastatic disease or ADT-free lower-risk management.

Surrogate imaging endpoint (plaque volume), not clinical MACE; small single-institution N=94, 12-month follow-up. Open-label, with a non-randomized RT-alone control cohort.

Small single-institution randomized trial, surrogate coronary-plaque imaging endpoint (not clinical MACE), 12-mo f/u; mechanistically supports HERO but doesn't independently establish clinical benefit.

In an intermediate or high-risk non-metastatic prostate pt getting definitive RT plus ADT with elevated cardiovascular risk, this supports favoring relugolix over leuprolide on a coronary-plaque basis; it does not extend to ADT-free lower-risk pts or to hard cardiovascular-event rates.

📚 Sources · 📄 1 paper
📄 PAPER · UroToday
REVELUTION Trial: A Comparative Study of GnRH Agonist and Antagonist on Coronary Plaque in Prostate Cancer - Sagar Patel
Abstract
UroToday - GU OncToday brings coverage of the clinically relevant content needed to stay at the forefront of the dynamic field of GU oncology and urology.
📝 https://www.urotoday.com/video-lectures/prostate-cancer/video/5353-revelution-trial-a-comparative-study-of-gnrh-agonist-and-antagonist-on-coronary-plaque-in-prostate-cancer-sagar-patel.html?mtm_campaign=Patel_SocialVideo_ID5353
Early signal

ORIOLE NCT02680587

ForRecurrent HSPC, 1-3 conventional-imaging mets, off ADT ≥6mo

Progression at 6 months (composite) surrogate

19% vs 61%

P=.005; SABR vs observation

TL;DR6-mo progression 19% vs 61% favoring SABR (P=.005); mPFS NR vs 5.8mo, HR 0.30 (0.11-0.81) in oligomet HSPC.

Surfaced from a review's discussed trials

Why it mattersRadiation oncology

The RT read is completeness, not SABR alone: among SABR pts, leaving any PSMA-avid lesion untreated collapsed DMFS to 6.0 vs 29.0 mo (HR 0.19, 0.07-0.54). Conventional imaging under-stages, so PSMA-PET staging plus total consolidation, not partial MDT, is the decision this moves. SABR dose/fractionation not reported in source.

9 details 5 trials watching

Phase 2 randomized trial, 2:1 SABR vs observation, N=54 at 3 US radiation centers. Primary: composite progression at 6 mo. Median follow-up 18.8 mo.

Recurrent hormone-sensitive prostate cancer, 1-3 asymptomatic mets ≤5 cm on conventional imaging, prior definitive treatment of the primary. No ADT within 6 mo. Median age 68.

SABR to all conventional-imaging metastases; PSMA-PET obtained but blinded to planning. Dose/fractionation not reported in source. Local control 98.9% at 6 mo.

Because PET was blinded, 16/36 SABR pts had untreated PET-avid lesions; any untreated lesion collapsed DMFS to 6.0 vs 29.0 mo (HR 0.19). Total consolidation, not SABR per se, drove the benefit.

Concordant with STOMP (phase 2 MDT in oligomet PC): both show metastasis-directed therapy delays progression and defers ADT. The pooled ORIOLE+STOMP analysis reinforced the signal.

recurrent hormone-sensitive oligometastatic prostate cancer, 1-3 mets, off ADT
Does not represent higher-volume, castration-resistant, or ADT-dependent disease.

Phase 2, N=54; composite surrogate primary read at 6 mo, not OS-powered. Open-label observation control. Conventional-imaging staging misses PET-avid disease.

EndpointSABRObservationEffect
6-mo progression (composite)7/36 (19%)11/18 (61%)P=.005
6-mo PSA progression4/36 (11%)9/18 (50%)P=.005
Median PFSNot reached5.8 moHR 0.30 (0.11-0.81), P=.002
Median biochemical PFSNot reached6.4 moHR 0.31 (0.13-0.75), P=.002
EndpointNo untreatedAny untreatedEffect
6-mo progression1/19 (5%)6/16 (38%)P=.03
Median PFSNot reached11.8 moHR 0.26 (0.09-0.76), P=.006
New mets 180d3/19 (15.8%)10/16 (62.5%)P=.006
DMFS29.0 mo6.0 moHR 0.19 (0.07-0.54), P<.001

Phase 2, N=54; composite progression primary read at only 6mo. Randomised but small, short f/u. Concordant with STOMP MDT signal; awaits phase 3.

In recurrent HSPC with 1-3 conventional-imaging mets and off ADT ≥6mo, this supports metastasis-directed SABR to defer systemic therapy; it does not extend to higher-volume or castration-resistant disease.

📚 Sources · 📄 1 paper
📄 PAPER Phillips; Shi; Deek et al. · JAMA oncology (2020-05)
Outcomes of Observation vs Stereotactic Ablative Radiation for Oligometastatic Prostate Cancer: The ORIOLE Phase 2 Randomized Clinical Trial.
Abstract
IMPORTANCE: Complete metastatic ablation of oligometastatic prostate cancer may provide an alternative to early initiation of androgen deprivation therapy (ADT).<br/><br/>OBJECTIVE: To determine if stereotactic ablative radiotherapy (SABR) improves oncologic outcomes in men with oligometastatic prostate cancer.<br/><br/>DESIGN, SETTING, AND PARTICIPANTS: The Observation vs Stereotactic Ablative Radiation for Oligometastatic Prostate Cancer (ORIOLE) phase 2 randomized study accrued participants from 3 US radiation treatment facilities affiliated with a university hospital from May 2016 to March 2018 with a data cutoff date of May 20, 2019, for analysis. Of 80 men screened, 54 men with recurrent hormone-sensitive prostate cancer and 1 to 3 metastases detectable by conventional imaging who had not received ADT within 6 months of enrollment or 3 or more years total were randomized.<br/><br/>INTERVENTIONS: Patients were randomized in a 2:1 ratio to receive SABR or observation.<br/><br/>MAIN OUTCOMES AND MEASURES: The primary outcome was progression at 6 months by prostate-specific antigen level increase, progression detected by conventional imaging, symptomatic progression, ADT initiation for any reason, or death. Predefined secondary outcomes were toxic effects of SABR, local control at 6 months with SABR, progression-free survival, Brief Pain Inventory (Short Form)-measured quality of life, and concordance between conventional imaging and prostate-specific membrane antigen (PSMA)-targeted positron emission tomography in the identification of metastatic disease.<br/><br/>RESULTS: In the 54 men randomized, the median (range) age was 68 (61-70) years for patients allocated to SABR and 68 (64-76) years for those allocated to observation. Progression at 6 months occurred in 7 of 36 patients (19%)&#x2009;receiving SABR and 11 of 18 patients (61%) undergoing observation (P&#x2009;=&#x2009;.005). Treatment with SABR improved median progression-free survival (not reached vs 5.8 months; hazard ratio, 0.30; 95% CI, 0.11-0.81; P&#x2009;=&#x2009;.002). Total consolidation of PSMA radiotracer-avid disease decreased the risk of new lesions at 6 months (16% vs 63%; P&#x2009;=&#x2009;.006). No toxic effects of grade 3 or greater were observed. T-cell receptor sequencing identified significant increased clonotypic expansion following SABR and correlation between baseline clonality and progression with SABR only (0.082085 vs 0.026051; P&#x2009;=&#x2009;.03).<br/><br/>CONCLUSIONS AND RELEVANCE: Treatment with SABR for oligometastatic prostate cancer improved outcomes and was enhanced by total consolidation of disease identified by PSMA-targeted positron emission tomography. SABR induced a systemic immune response, and baseline immune phenotype and tumor mutation status may predict the benefit from SABR. These results underline the importance of prospective randomized investigation of the oligometastatic state with integrated imaging and biological correlates.<br/><br/>TRIAL REGISTRATION: ClinicalTrials.gov Identifier: NCT02680587.
📝 Auto-resolved from a review's discussed trials (ORIOLE).
Confirmatory

RADIOSA NCT03940235

ForMetachronous oligorecurrent HSPC, ≤3 lesions, post-radical local tx

TL;DRmcPFS 32.2 vs 15.1mo, HR 0.43 (0.26-0.72), p=0.001 adding 6mo ADT to metastasis-directed SBRT in oligorecurrent HSPC.

Surfaced from a review's discussed trials

Why it mattersRadiation oncology

Both arms get ablative SBRT (30 Gy/3fx, BED >100 Gy) to all sites, so the trial isolates the 6-mo ADT add-on, not SBRT's own contribution (no observation arm). The decision it moves: whether to layer short ADT onto metastasis-directed SBRT. SBRT alone still gave 15.1-mo cPFS in selected pts.

Also covered May 17

8 details 2 trials watching

Single-centre, randomised, open-label phase 2 (European Institute of Oncology, Milan). N=105 randomised 1:1 (52 SBRT alone, 53 SBRT+ADT); modified ITT, 51/arm analysed. Median follow-up 31 mo.

Metachronous oligorecurrent hormone-sensitive prostate cancer after radical local treatment; ≤3 lesions (pelvic/extra-regional nodal or bone) on PSMA-PET or MRI; ECOG 0-1; median age 70. Stratified by PSMA-DT (≤3 vs >3 mo), site (node vs bone), imaging.

SBRT 30 Gy in 3 fractions every other day (EQD2 98.6 Gy at α/β 1.5, BED >100 Gy), or equivalent by site. All oligometastatic sites treated in both arms.

The SBRT+ADT arm added 6 months of LHRH-analogue ADT starting within 1 week before SBRT.

Primary: clinical progression-free survival. OS and time-to-CRPC were not the primary read.

Adding short ADT roughly doubled median cPFS; effect sizes in the results table.

Near-absent RT toxicity: 1 G1 GI, 1 G3 GU (left ureter stenosis, SBRT+ADT), no late effects. ADT added 22 G1 AEs, all resolved. No treatment-related deaths.

First RCT of adding short ADT to MDT in metachronous oligorecurrent HSPC. STOMP/ORIOLE established MDT vs observation; RADIOSA instead isolates the ADT add-on onto an SBRT backbone.

metachronous oligorecurrent hormone-sensitive prostate cancer with ≤3 lesions after radical local treatment
Does not represent synchronous, polymetastatic (>3 lesions), or castration-resistant disease.

Single-centre, open-label, N=105. Primary endpoint is clinical PFS, a surrogate; ADT's own progression-delaying effect confounds the SBRT+ADT arm. Optimal ADT duration untested.

Single-centre open-label phase 2, N=105; 1° EP is clinical PFS (surrogate), not OS. Consistent with STOMP/ORIOLE MDT signals; not definitive enough to change practice.

In metachronous oligorecurrent hormone-sensitive prostate cancer with ≤3 lesions on PSMA-PET, this supports adding 6 mo ADT to metastasis-directed SBRT for longer cPFS; it does not address synchronous or polymetastatic disease, and SBRT alone remains reasonable in carefully selected pts.

📚 Sources · 📄 1 paper
📄 PAPER Marvaso; Corrao; Zaffaroni et al. · The Lancet. Oncology (2025-03)
ADT with SBRT versus SBRT alone for hormone-sensitive oligorecurrent prostate cancer (RADIOSA): a randomised, open-label, phase 2 clinical trial.
Abstract
BACKGROUND: Metastasis-directed therapy by stereotactic body radiotherapy (SBRT) has been shown to improve clinical outcomes in the oligometastatic prostate cancer setting. We aimed to investigate whether short-course androgen deprivation therapy (ADT) and SBRT at all oligometastatic sites versus SBRT alone improves clinical progression-free survival in men with metachronous oligorecurrent hormone-sensitive prostate cancer.<br/><br/>METHODS: The RADIOSA study was a single-centre, randomised, open-label, controlled phase 2 trial done in the European Institute of Oncology, IRCCS, Milan, Italy. Key eligibility criteria were histologically proven initial diagnosis of adenocarcinoma of the prostate, biochemical progression after radical local prostate treatment, nodal relapse in the pelvis, extra-regional nodal relapse, bone metastases at next-generation imaging with a maximum of three lesions, Eastern Cooperative Oncology Group (ECOG) performance status 0-1, and age 18 years or older. Participants were stratified according to prostate-specific membrane antigen doubling time (&#x2264;3 vs >3 months), metastases localisation (node vs bone), and diagnostic imaging (positron emission tomography vs MRI) and were randomly assigned (1:1) using a computer-generated random number to SBRT alone or SBRT in combination with 6 months of ADT. For SBRT treatment, a schedule of 30 Gy in three fractions every other day (with the equivalent dose in 2 Gy fractions being 98&#xb7;6 Gy, considering &#x3b1;/&#x3b2; ratio of 1&#xb7;5 Gy and biologically effective dose of >100 Gy), or equivalent regimens depending on disease site location, was administered. Patients in the SBRT with ADT group received 6 months of ADT with a luteinising hormone-releasing hormone analogue within 1 week before the start of SBRT. The allocated treatment was not masked. The primary outcome measure was clinical progression-free survival. All analyses followed a modified intention-to-treat principle, consisting of all patients assigned to a treatment group who had available data. The trial is registered at ClinicalTrials.gov, NCT02680587, and is complete.<br/><br/>FINDINGS: Between Aug 1, 2019, and April 30, 2023, 218 patients were assessed for eligibility, 113 were excluded, and 105 were enrolled and randomly assigned to an intervention (52 to SBRT only and 53 to SBRT with ADT). Three patients were lost to follow-up and 51 patients in each group were assessed for the primary outcome. The median age at study enrolment was 70 years (IQR 65-75); data on race and ethnicity were not collected. With a median follow-up of 31 months (IQR 16-36) for both groups, the median clinical progression-free survival was 15&#xb7;1 months (95% CI 12&#xb7;4-22&#xb7;8) for the SBRT group versus 32&#xb7;2 months (22&#xb7;4-not reached) for the SBRT with ADT group (hazard ratio 0&#xb7;43 [95% CI 0&#xb7;26-0&#xb7;72], p=0&#xb7;0010]). One gastrointestinal grade 1 adverse event (SBRT group) and one genitourinary grade 3 adverse event (left ureter stenosis, SBRT with ADT group) were reported, with no late toxicities observed. 22 grade 1 ADT-related adverse events were reported, all of which had resolved at the last follow-up. No treatment-related deaths were recorded.<br/><br/>INTERPRETATION: To our knowledge, the RADIOSA trial represents the first randomised trial in the metachronous oligometastatic hormone-sensitive prostate cancer setting to report improved clinical progression-free survival with the combination of SBRT and a short course of ADT, although carefully selected patients might still benefit from SBRT alone. By demonstrating improved clinical progression-free survival, the RADIOSA trial reinforces the role of metastasis-directed therapy in delaying systemic treatment escalation. Additionally, it underscores the need for further studies to determine the optimal duration of ADT and identify biomarkers predicting response to SBRT alone.<br/><br/>FUNDING: Italian Association of Cancer Research.
📝 Auto-resolved from a review's discussed trials (RADIOSA).
Confirmatory

ARTO NCT03449719

ForOligometastatic CRPC, ≤3 nonvisceral mets, first-line abiraterone

Biochemical response (PSA ≥50% drop at 6mo) surrogate

92% vs 68.3%

OR 5.34 (95% CI 2.05-13.88), P=.001

TL;DRAdding SBRT to abiraterone lifted 6-mo PSA response to 92% vs 68.3% (OR 5.34) and cut progression (PFS HR 0.35) in oligomet CRPC.

Surfaced from a review's discussed trials

Why it mattersRadiation oncology

The RT read is total metastatic consolidation: SBRT to all ≤3 CRPC sites concurrent with abiraterone more than doubled complete PSA response (56% vs 23.2%) and cut progression risk (HR 0.35). It pushes MDT beyond hormone-sensitive oligomet (ORIOLE/STOMP) into first-line CRPC, moving the decision to irradiate every lesion, not defer.

Also covered Jul 7

6 details 5 trials watching

Multicenter randomized phase II, 1:1, N=157, enrolled Jan 2019-Sep 2022. Primary: 6-month biochemical response.

Oligometastatic castration-resistant prostate cancer with ≤3 nonvisceral metastatic lesions, in the first-line abiraterone setting.

Both arms received abiraterone acetate + prednisone (AAP). The experimental arm added concomitant SBRT.

SBRT to all sites of disease, concomitant with AAP. Dose/fractionation not reported in source.

Primary: biochemical response (PSA drop ≥50% at 6mo). Secondary: complete BR (PSA <0.2 ng/mL), PFS.

Primary endpoint and PFS both met, favoring the SBRT arm (see results table).

Endpoint (6mo)AAP+SBRTAAP aloneEffect size
Biochemical response (PSA ≥50% drop)92%68.3%OR 5.34 (2.05-13.88), P=.001
Complete BR (PSA <0.2 ng/mL)56%23.2%OR 4.22 (2.12-8.38), P<.001

Extends the metastasis-directed SBRT benefit seen in ORIOLE/STOMP (hormone-sensitive oligomet) into first-line CRPC.

oligometastatic CRPC (≤3 nonvisceral mets) on first-line abiraterone
Does not represent visceral, polymetastatic, or hormone-sensitive disease.

Phase II, N=157. Primary endpoint is a PSA surrogate with no OS reported; dose/fractionation and long-term durability not in source.

Randomized phase II, primary hit, named comparator (AAP alone); primary is a PSA surrogate, so supportive of the emerging oligomet MDT paradigm rather than practice-setting.

In oligometastatic CRPC (≤3 nonvisceral mets) starting first-line abiraterone, this supports adding SBRT to all sites for deeper PSA response and longer PFS; it does not extend to visceral or polymetastatic disease.

📚 Sources · 📄 1 paper
📄 PAPER Francolini; Allegra; Detti et al. · Journal of clinical oncology : official journal of the American Society of Clinical Oncology (2023-12)
Stereotactic Body Radiation Therapy and Abiraterone Acetate for Patients Affected by Oligometastatic Castrate-Resistant Prostate Cancer: A Randomized Phase II Trial (ARTO).
Abstract
PURPOSE: ARTO (ClinicalTrials.gov identifier: NCT03449719) is a multicenter, phase II randomized clinical trial testing the benefit of adding stereotactic body radiation therapy (SBRT) to abiraterone acetate and prednisone (AAP) in patients with oligometastatic castrate-resistant prostate cancer (CRPC).<br/><br/>MATERIALS AND METHODS: All patients were affected by oligometastatic CRPC as defined as three or less nonvisceral metastatic lesions. Patients were randomly assigned 1:1 to receive either AAP alone (control arm) or AAP with concomitant SBRT to all the sites of disease (experimental arm). Primary end point was the rate of biochemical response (BR), defined as a prostate-specific antigen (PSA) decrease &#x2265;50% from baseline measured at 6 months from treatment start. Complete BR (CBR), defined as PSA < 0.2 ng/mL at 6 months from treatment, and progression-free survival (PFS) were secondary end points.<br/><br/>RESULTS: One hundred and fifty-seven patients were enrolled between January 2019 and September 2022. BR was detected in 79.6% of patients (92% v 68.3% in the experimental v control arm, respectively), with an odds ratio (OR) of 5.34 (95% CI, 2.05 to 13.88; P = .001) in favor of the experimental arm. CBR was detected in 38.8% of patients (56% v 23.2% in the experimental v control arm, respectively), with an OR of 4.22 (95% CI, 2.12 to 8.38; P < .001). SBRT yielded a significant PFS improvement, with a hazard ratio for progression of 0.35 (95% CI, 0.21 to 0.57; P < .001) in the experimental versus control arm.<br/><br/>CONCLUSION: The trial reached its primary end point of biochemical control and PFS, suggesting a clinical advantage for SBRT in addition to first-line AAP treatment in patients with metastatic castration-resistant prostate cancer.
📝 Auto-resolved from a review's discussed trials (ARTO).
Confirmatory

RTOG 0539 NCT00895622

ForWHO grade 1-3 meningioma, post-resection, newly diagnosed or recurrent

TL;DR10-yr PFS 72.2% intermediate-risk (54Gy) and 42.5% high-risk (60Gy) meningioma on adjuvant RT; low-risk observed 85.2%.

Why it mattersRadiation oncology

The RT read is patient selection: low-risk grade 1 (GTR/STR) observed carried only 8.9% 10-yr cumulative progression, backing omission, while intermediate-risk earns 54Gy/30fx adjuvant. High-risk 60Gy still leaves 39.3% 10-yr progression, marking the ceiling of adjuvant RT alone in grade 2/3 disease.

7 details 5 trials watching

Prospective phase 2, multi-institutional (NRG/RTOG), risk-adapted by WHO grade, extent of resection, and recurrence status. 244 consented, 165 protocol-treated. Central pathology review; data cutoff 8/15/2023.

Adults ≥18, Zubrod 0-1, histologically confirmed unifocal WHO grade 1-3 meningioma, any resection extent. Low-risk n=60, intermediate n=52, high-risk n=53.

Intermediate-risk 54 Gy and high-risk 60 Gy, both in 30 fractions, adjuvant. Low-risk received no RT (observation). No hypofractionation or SRS arm.

Primary (3-yr PFS) reported previously. This analysis reports long-term PFS, OS, and cumulative incidence of progression (competing-risk) at ~12-yr median follow-up.

Per-cohort 10-yr PFS, OS, and cumulative-incidence values are in the table above. Median PFS not reached for low- and intermediate-risk.

Cohort (management)10-yr PFS10-yr OS10-yr cum. incidence progression
Low-risk, observed85.2%94.1%8.9% (3.2-18.2)
Intermediate, 54Gy72.2%84.7%21.2% (10.8-33.9)
High-risk, 60Gy42.5%51.1%39.3% (25.8-52.5)

RT-attributable grade 3+ toxicity 9.6% (intermediate, 5/52) and 15.1% (high-risk, 8/53). The observed low-risk cohort carried no RT toxicity.

No randomised RT-vs-observation trial in grade 2 meningioma has reported. ROAM/EORTC-1308 and NRG-BN003 (GTR grade 2) remain open; RTOG 0539 is the prospective benchmark.

newly diagnosed or recurrent unifocal WHO grade 1-3 meningioma across resection extents, risk-stratified
Does not represent multifocal meningioma or patients treated with SRS or hypofractionation.

Each risk cohort is single-arm, no randomised RT-vs-observation comparison; modest per-cohort N (~50-60); grading predates molecular integration into WHO CNS grading.

Prospective multi-institutional risk-adapted phase 2, 12-yr mature f/u, sets RT patient-selection benchmark. Each cohort single-arm; no randomised RT-vs-observation comparison.

In newly diagnosed grade 1 meningioma after gross or subtotal resection, this supports observation over adjuvant RT; it does not soften the case for 54-60Gy in recurrent grade 1, grade 2, or grade 3 disease.

📚 Sources · 📄 1 paper
📄 PAPER Kotecha, Rupesh; Polley, Mei-Yin; Vogelbaum, Michael A. et al. · Journal of Clinical Oncology (2026-05)
Long-Term Analysis of NRG Oncology RTOG 0539: A Phase II Trial of Observation for Low-Risk Meningioma and Radiotherapy for Intermediate- and High-Risk Meningioma
Abstract
NRG Oncology RTOG 0539 was a prospective phase II trial of risk-adapted radiotherapy for patients with WHO grade 1-3 meningioma. Low-risk (group 1, n = 60) was defined as a grade 1 tumor after gross total resection or subtotal resection (GTR/STR) and prospectively monitored. Intermediate-risk (group 2, n = 52) was defined as recurrent grade 1 or newly diagnosed grade 2 tumor after GTR and treated with radiotherapy (54 Gy). High-risk (group 3, n = 53) included a newly diagnosed grade 2 tumor after STR, newly diagnosed grade 3 tumor, or recurrent grade 2 or 3 tumor and treated with radiotherapy (60 Gy). Progression-free survival (PFS) and overall survival (OS) were estimated using the Kaplan-Meier method. The median follow-up times for the low-, intermediate-, and high-risk cohorts were 12.1, 12.0, and 11.1 years, respectively. The 10-year PFS and OS rates for the low-, intermediate-, and high-risk cohorts were 85.2% and 94.1%, 72.2% and 84.7%, and 42.5% and 51.1%, respectively. Five patients (9.6%) and eight patients (15.1%) had a grade 3+ toxicity attributed to radiotherapy in the intermediate- and high-risk cohorts, respectively. The long-term outcomes using this risk-adapted approach support observation for low-risk patients, inform radiotherapy patient selection and practice standards for intermediate- and high-risk patients, and provide comparative benchmarks for future trials.
Early signal

RAD-IO

ForT2-T4a N0M0 muscle-invasive urothelial bladder cancer

TL;DR12-mo DFS 40/50 (80%, 95% CI 0.67-0.89) cleared the pre-set ≥75% GO bar for durvalumab added to 5FU/MMC chemoRT in MIBC.

Why it mattersRadiation oncology

RT is standard and transferable: 55Gy/20fx to bladder, plus 46Gy/20fx elective nodal coverage in the node-positive expansion, extending durvalumab-chemoRT preservation to N+ disease. 12-mo DFS 80% (40/50, 95% CI 0.67-0.89) cleared the pre-set ≥75% GO bar vs BC2001. Moves whether to layer IO onto a hypofractionated preservation backbone.

RAD-IO
+1 more figure
Durvalumab (N=54): completed planned treatment 33 (61%), discontinued early 21 (39%).
Durvalumab (N=54): completed planned treatment 33 (61%), discontinued early 21 (39%).
8 details 4 trials watching

Single-arm, multi-stage feasibility and safety trial testing durvalumab added to 5FU/MMC chemoradiation for bladder preservation. Benchmarked against BC2001 historical CRT data, not a randomised comparator.

T2-T4a N0M0 urothelial muscle-invasive bladder cancer, stratified by prior neoadjuvant chemotherapy (yes vs no). A stage-1 expansion added the first 6 node-positive pts.

Durvalumab 1500 mg given neoadjuvant, synchronous, and adjuvant to 12 months post-chemoRT. Concurrent 5-FU 500 mg/m²/24h ×5 days and mitomycin C 12 mg/m².

55 Gy in 20 fractions to bladder (hypofractionated). Node-positive expansion added 46 Gy/20 fx elective nodal RT.

Primary: 12-month disease-free survival post-chemoRT, read against a GO/NO-GO framework (GO ≥75%, contextual 60-75%, NO-GO <60%).

12-mo DFS 40/50 (80%), 95% CI 0.67-0.89, clearing the ≥75% GO bar. 33/54 (61%) completed planned durvalumab; investigators reported very high bladder-preservation and DFS vs prior trial data.

AEs reported in line with component therapies (chemoRT plus durvalumab). 21/54 (39%) discontinued durvalumab early.

Benchmarked against BC2001 (James, JCO 2016), where adding 5FU/MMC to RT gave DFS HR 0.78 (0.60-1.02), p=0.07. RAD-IO's 80% 12-mo DFS is claimed higher than prior data, but the comparison is non-randomised.

T2-T4a N0M0 muscle-invasive urothelial bladder cancer suitable for bladder-preservation chemoRT
Does not represent metastatic disease, radical-cystectomy-preferred pts, or node-positive disease beyond the 6-patient expansion.

Single-arm with a historical benchmark and no concurrent IO comparator; 12-mo DFS is an early surrogate; small N (~50 evaluable); node-positive experience limited to 6 pts.

Single-arm feasibility stage, no randomised IO comparator; benchmarked against historical BC2001. 12-mo DFS an early surrogate at small N; met pre-set GO bar for further evaluation only.

In T2-T4a N0M0 MIBC opting for bladder preservation, this supports durvalumab layered onto 5FU/MMC chemoRT as worth further evaluation; it does not yet establish that IO improves on chemoRT alone, and node-positive experience rests on only 6 expansion pts.

📚 Sources · 🐦 3 tweets
Early signal

A-DREAM

FormHSPC deep responder (PSA<0.2) after 18-24mo ADT + ≥12mo ARPI

TL;DR41% remained treatment-free with eugonadal testosterone recovery at 18mo after interrupting ADT+ARPI in deep-responding mHSPC (1° EP met, one-sided p=0.0249).

Monday clinic

In metastatic HSPC deep responders (PSA<0.2 after ≥18mo ADT and ≥12mo ARPI, predominantly low-volume), this supports discussing a monitored ADT+ARPI holiday with scheduled PSA/imaging; it does not extend to incomplete responders or high-volume disease.

Median time to eugonadal T 9.0mo. T recovery by 18mo 52 (66.7%); treatment-free 18mo 45 (57.7%); primary endpoint (treatment-free + T recovery) 32 (41.0%), 80% CI 33.1-48.9%, one-sided p 0.0249
Median time to eugonadal T 9.0mo. T recovery by 18mo 52 (66.7%); treatment-free 18mo 45 (57.7%); primary endpoint (treatment-free + T recovery) 32 (41.0%), 80% CI 33.1-48.9%, one-sided p 0.0249
+2 more figures
A-DREAM
A-DREAM
8 details 4 trials watching

Phase 2 single-arm Alliance trial. N=78 eligible metastatic HSPC deep responders interrupt ADT+ARPI. Enrolled 07/2022-03/2024; median follow-up 26.9mo.

Entry required PSA<0.2 (stable/falling) after 18-24mo ADT and 12mo ARPI. Median age 70 (49-90); 64.9% low-volume, 35.1% high-volume (CHAARTED); 51.3% had prior local radiation, 29.5% metastasis-directed radiation.

Primary: treatment-free with eugonadal testosterone (≥150 ng/dL) at 18 months. Exploratory: rPFS, TTNT, OS, cost.

Primary met: 32/78 (41.0%) treatment-free and eugonadal at 18mo (80% CI 33.1-48.9%, one-sided p=0.0249). 57.7% were treatment-free at 18mo and 66.7% recovered testosterone; median time to eugonadal T 9.0mo.

Disease control held through interruption: rPFS 15/78 events, OS 4/78 events, both medians not reached. The 41% primary is capped by slow testosterone recovery, not progression, so the endpoint understates short-term oncologic safety in this older cohort.

metastatic HSPC deep responders (PSA<0.2 after ≥18mo ADT + ≥12mo ARPI), low-volume-predominant
Does not represent incomplete responders, high-volume disease, or patients unwilling to accept delayed testosterone recovery.

Single-arm with no randomised comparator against continued therapy, so the survival cost of interruption is unquantified. Median follow-up 26.9mo is short for mHSPC; durability of treatment-free intervals is unproven.

Single-arm phase 2, N=78, no randomised comparator vs continued therapy; primary endpoint met but interruption safety needs longer follow-up and randomisation.

📚 Sources · 🐦 1 tweet
Confirmatory

ARACOG (AFT-47)

ForAdvanced prostate cancer (mHSPC/mCRPC/nmCRPC) starting an ARSI

TL;DRMCCD -36.1 (enza) vs -15.8 (daro), P=0.009 at 24 wk: enzalutamide worse for cognition; randomized open-label phase 2, N=111 advanced prostate.

Monday clinic

In advanced prostate cancer pts where cognitive tolerability drives ARSI selection, this randomized head-to-head supports darolutamide over enzalutamide for cognitive sparing; it does not address efficacy or compare against apalutamide or abiraterone.

ARACOG (AFT-47)
Arm (N)Max-changed domainMedian % changeP
Darolutamide (48)PALFAM (visual mem/exec)-15.80.009
Enzalutamide (47)SWM (working mem/exec)-36.1n/a
+1 more figure
ARACOG (AFT-47)
7 details 2 trials watching

Randomized open-label phase 2, N=111, darolutamide vs enzalutamide, stratified by age (<65, 65-80, >80). US academic centers only; enrolled 8/2021 to 3/2025, crossover permitted.

Advanced prostate cancer across mHSPC, mCRPC, and nmCRPC. Required acceptable enzalutamide co-pay; predominantly White, with most non-White pts randomized to enzalutamide.

Darolutamide provided by the study vs enzalutamide through standard of care, an asymmetry that could bias crossover and adherence.

Primary: between-arm % change from baseline to 24 wk in Maximally Changed Cognitive Domain (MCCD), from 5 remotely delivered CANTAB tests. Crossovers scored at crossover in their randomized arm.

MCCD median change -36.1 (enza, N=47) vs -15.8 (daro, N=48), P=0.009: greater cognitive decline on enzalutamide.

First randomized head-to-head of cognition for these two ARSIs; direction fits darolutamide's minimal blood-brain-barrier penetration vs enzalutamide's CNS exposure.

advanced prostate cancer pts (mHSPC, mCRPC, nmCRPC) choosing between darolutamide and enzalutamide
Does not represent apalutamide, abiraterone, or head-to-head efficacy comparisons.

Open-label with a functional endpoint; enzalutamide via standard of care may have altered crossover. CANTAB is a research tool, not a clinical diagnostic; small N and race-by-arm imbalance limit inference.

Randomized head-to-head met its prespecified cognitive endpoint; aligns with darolutamide's known low CNS penetration. Phase 2, open-label, small N keep it below practice-changing.

📚 Sources · 🐦 2 tweets
Early signal

ESAONA

ForTreatment-naive EGFR-mutant NSCLC with brain metastases

TL;DRiORR 95.5% vs 79.6% (p=0.0004) and icPFS HR 0.46 favoring asandeutertinib over osimertinib in 1L EGFR-mut NSCLC brain mets.

Why it mattersRadiation oncology

The RT-relevant read is upfront local therapy: iORR 95.5% vs 79.6% and intracranial PFS not reached (HR 0.46) strengthen deferring upfront SRS/WBRT in favor of TKI in EGFR-mut brain mets. No head-to-head vs radiosurgery, so it moves sequencing, not RT omission at progression.

7 details 5 trials watching

Randomised phase 2, N=224 (111 asandeutertinib vs 113 osimertinib), 1L EGFR-mutant NSCLC with brain metastases. All efficacy endpoints BICR-assessed. Blinding not specified in source.

Treatment-naive (1L) EGFR-mutant NSCLC with brain metastases. Mutation subtype, symptomatic status, and prior brain RT not reported in source.

Asandeutertinib (next-generation EGFR TKI) vs osimertinib. Dose and schedule not reported in source.

Intracranial endpoints (response, icPFS) drove the result and cleared significance more decisively than the borderline overall PFS benefit. Full arm comparison in the table above.

EndpointAsandeutertinibOsimertinibHR (p)
iORR95.5% (89.8-98.5)79.6% (71.0-86.6)p=0.0004
Intracranial PFSNR17.5 mo (15.18-NA)HR 0.46, p=0.0020
Overall PFSNR17.2 mo (15.18-19.55)HR 0.64, p=0.0473

Any TRAEs 99.1% vs 95.6%; serious TRAEs numerically higher with asandeutertinib (10.8% vs 7.1%). Fatal and discontinuation rates not reported in source.

Osimertinib is the established CNS-active 1L EGFR TKI (FLAURA). Asandeutertinib raises the intracranial bar in phase 2, but no OS or phase 3 head-to-head yet.

treatment-naive EGFR-mutant NSCLC with brain metastases
Does not represent EGFR-wildtype disease or brain metastases progressing on a prior EGFR TKI.

Phase 2 with immature time-to-event data (medians not reached); overall PFS benefit borderline (p=0.0473); no OS; blinding not specified.

Strong intracranial activity revives whether a CNS-active TKI can defer upfront brain-directed RT/SRS in EGFR-mutant NSCLC. Phase 3 confirmation vs osimertinib, plus OS and durability, is needed before displacing the standard.

Randomised phase 2; strong intracranial ORR but time-to-event immature (medians NR), overall PFS borderline (p=0.0473), no OS. Needs phase 3 before displacing osimertinib.

In treatment-naive EGFR-mutant NSCLC with brain metastases, this supports a TKI-first, SRS-deferred read; it does not extend to EGFR-wildtype disease or brain mets progressing on a prior EGFR TKI.

📚 Sources · 🐦 1 tweet
Caveats dominate

SPIN Score (Celiac Plexus SRS) NCT03323489

ForPancreatic cancer, intractable retroperitoneal pain, celiac SRS candidates

TL;DR89% pain response at SPIN 2 vs 32% at SPIN 0 for celiac SRS; post-hoc selection score, n=90.

Why it mattersRadiation oncology

Response is threshold-gated on baseline pain (>6 → 65.8%, rising to 85.7% at >8), and the strongest predictor was neurotoxic-chemo exposure (multivariate OR 5.1). The RT decision this moves is timing: refer for celiac SRS before neurotoxic agents. SRS dose/fractionation not reported in source (parent Lancet Oncol trial).

9 details

Post-hoc predictor analysis of the pivotal single-arm phase 2 celiac plexus SRS trial (NCT03323489, Lancet Oncol 2024). 90 evaluable pts; univariate/multivariate logistic regression with 500-iteration bootstrap internal validation.

Pancreatic-cancer pts with intractable retroperitoneal (celiac) cancer pain treated on the phase 2 SRS trial. Age and BMI were the prior-reported predictors; median baseline values not in source.

Celiac plexus radiosurgery, target D12-L2. Dose and fractionation not reported in source (specified in the parent Lancet Oncol trial), so transferability of the technique can't be judged here.

Pain response = ≥2-point reduction in average BPI-SF pain from baseline to 3 weeks. Score performance judged by optimism-corrected AUC.

Two independent predictors (severe baseline pain, no prior neurotoxic chemo) build a 0-2 score with a monotonic response gradient (see tables). Discrimination modest, AUC 0.714 corrected.

SPIN scorePain responsen
032%31
153%40
289%19
PredictorUnivariate ORMultivariate OR
Neurotoxic chemo exposure5.33 (2.13-13.4), p<0.0015.1, p=0.009
Baseline pain intensity1.73, p=0.0031.8, p=0.003
Age1.06, p=0.014dropped (collinearity)
Therapy line0.65, p=0.04dropped (collinearity)

Celiac plexus SRS is a novel non-invasive palliative option recently added to NCCN guidelines. This analysis converts the parent trial's flat response into an actionable selection score and argues for earlier use, before neurotoxic chemotherapy.

pancreatic-cancer pts with intractable retroperitoneal pain evaluated for celiac plexus SRS
Does not represent pts already exposed to neurotoxic chemotherapy (lower predicted response) or non-pancreatic retroperitoneal pain.

Post-hoc, single-arm data; predictors are associative. Internal bootstrap validation only (optimism-corrected AUC 0.714), external validation required. Subjective 3-week pain endpoint; score not prospectively tested.

Post-hoc predictor modeling of a single-arm phase 2; internal bootstrap validation only, external validation pending. Associations, not a prospectively validated selection tool.

In pancreatic-cancer pts with severe retroperitoneal pain and no prior neurotoxic chemo (SPIN 2), this supports earlier celiac plexus SRS, where 89% (n=19) achieved pain response; it does not extend to SPIN-0 pts, whose response was 32% (n=31).

  • External validation of the SPIN score in an independent cohort
  • Whether earlier SRS before neurotoxic chemo improves outcomes prospectively
  • Durability of pain response beyond 3 weeks
📚 Sources · 🐦 1 tweet
Challenges SOC

PEACE V-STORM NCT03569241

ForPelvic nodal oligorecurrent prostate (≤5 nodes), post radical local Rx, PS 0-1

Metastasis-free survival surrogate

76% vs 63% at 4y

HR 0·62 (80% CI 0·44-0·86), p=0·063

TL;DR4-yr MFS 76% vs 63% favoring ENRT over MDT for pelvic nodal oligorecurrence, HR 0·62 (80% CI 0·44-0·86, p=0·063).

Why it mattersRadiation oncology

The RT read: whole-pelvis ENRT (45 Gy/25fx + SIB 65 Gy) beat node-only MDT on 4-yr MFS (76% vs 63%, HR 0·62), consistent with occult pelvic nodal disease driving the failures MDT leaves untreated. Moves the elective-nodal-coverage decision in ≤5-node pelvic recurrence.

7 details 1 trial watching

Phase 2, open-label, randomised (1:1) screening trial, 21 hospitals in 6 countries. 196 randomised (MDT 99, ENRT 97), 190 evaluable, modified ITT. Median follow-up 50 mo (IQR 42-58).

Men with PET-detected pelvic nodal oligorecurrence (≤5 nodes) after radical local prostate treatment; WHO PS 0-1, histologically confirmed adenocarcinoma. All male.

ENRT: 45 Gy/25fx whole pelvis + SIB 65 Gy to PET-positive nodes (or salvage LND). MDT: SBRT 30 Gy/3fx every other day (or salvage LND). Both + 6 mo ADT. Stratified by tracer (choline vs PSMA) and MDT type.

Primary: metastasis-free survival (any M1 on PET or death), modified ITT. Reported with 80% CIs, a phase 2 screening threshold, not the conventional 95%.

Grade 3 events low in both arms and numerically higher with ENRT (urinary incontinence, diarrhoea). No treatment-related deaths.

First randomised ENRT-vs-MDT comparison for nodal oligorecurrence. Prior oligomet RCTs (STOMP, ORIOLE) tested MDT vs observation, not elective nodal RT, so this adds the missing head-to-head.

PET-detected pelvic nodal-only oligorecurrent prostate cancer (≤5 nodes) after radical local treatment
Does not represent extrapelvic M1, bone, or visceral oligometastatic recurrence.

Open-label; primary endpoint p=0·063 did not clear conventional significance and rests on a phase 2 screening design. Authors position ENRT as a potential standard awaiting phase 3.

EndpointENRT (80% CI)MDT (80% CI)HR (80% CI)
4-yr MFS76% (69-81)63% (56-69)0·62 (0·44-0·86), p=0·063
Grade 3 AEENRTMDT
Urinary incontinence10%6%
Diarrhoea2%1%

First randomised ENRT-vs-MDT comparison; ENRT's MFS edge diverges from MDT-favouring practice. Phase 2 screening design, p=0·063, awaits phase 3.

In men with PET-detected pelvic nodal-only oligorecurrence (≤5 nodes) after radical local treatment, this favors whole-pelvis ENRT over node-only MDT; it does not extend to extrapelvic M1, bone, or visceral oligometastatic recurrence.

📚 Sources · 📄 1 paper
📄 PAPER Piet Ost; Shankar Siva; Sigmund Brabrand et al. · The Lancet Oncology (2025-05)
Salvage metastasis-directed therapy versus elective nodal radiotherapy for oligorecurrent nodal prostate cancer metastases (PEACE V–STORM): a phase 2, open-label, randomised controlled trial
Confirmatory

EXTEND Trial

ForOligometastatic solid tumors, 1-5 mets, on standard systemic therapy

Progression-free survival surrogate

HR 0.54

95% CI 0.41-0.72, p<0.001 (per-protocol, all baskets)

TL;DRMDT+SOC improved PFS across all baskets, HR 0.54 (0.41-0.72), p<0.001; RT delivered 98% of MDT.

Why it mattersRadiation oncology

The RT-relevant read is that this is essentially an SBRT trial (98% of MDT was radiotherapy) layered on top of continued systemic therapy, so the PFS gain is attributable to local ablation, not a systemic switch. The prostate-excluded HR 0.60 (0.40-0.89) is what matters for referrals outside prostate. Dose and fractionation are not in the source abstract, which gates transfer to practice.

Also covered May 17

9 details 5 trials watching

Multicenter randomized phase II basket trial, accrual 2018 to 2023. Six baskets (breast, pancreas, kidney, two prostate, "Other") each with basket-specific stratification and powering. Median follow-up 53 months.

Patients with 1-5 metastases from solid tumors, randomized to MDT+SOC vs SOC systemic therapy alone. Screened 521, randomized 350, 334 analyzed per protocol (MDT+SOC n=166; SOC n=168).

Radiotherapy was the MDT for 98% of metastases (370/379), so this reads as an ablative RT trial in all but name. Dose, fractionation, and technique are not reported in the source abstract.

Primary: PFS, pre-specified in the per-protocol set within each basket, across all baskets, and across all baskets excluding prostate. Exploratory: ctDNA and immune profiling.

Overall PFS HR 0.54 (0.41-0.72), p<0.001; excluding prostate baskets HR 0.60 (0.40-0.89). Basket-level superiority in pancreas, prostate, and "Other"; breast and kidney inconclusive. Per-basket effect sizes not reported in source.

Detectable ctDNA at enrollment tracked with shorter PFS and survival; 3-month ctDNA clearance tracked with improved survival, raising the option of a ctDNA-refined oligometastatic definition. Systemic immune activation after MDT was most pronounced in the baskets that showed PFS superiority, offered as a candidate mechanism.

patients with 1-5 metastases on standard systemic therapy, with pancreas, prostate, and "Other" histologies carrying the signal
Does not represent breast or kidney oligometastatic disease, where the baskets were inconclusive.

Per-protocol, not ITT, primary analysis with 16 of 350 randomized patients excluded. Phase II with six baskets tested, so histology-specific claims are hypothesis-generating; no OS result reported in source.

Randomized phase II, primary PFS endpoint hit with 53mo f/u, but per-protocol analysis and basket design; histology signals explicitly framed as hypothesis-generating for phase III.

In pts with 1-5 metastases from pancreas or prostate primaries already on standard systemic therapy, this supports adding ablative MDT rather than systemic therapy alone; the breast and kidney baskets were inconclusive and do not carry the same read.

📚 Sources · 📄 1 paper
📄 PAPER Sherry; Haymaker; Wang et al. · Journal of clinical oncology : official journal of the American Society of Clinical Oncology (2026-05)
Addition of Metastasis-Directed Therapy to Standard of Care for Oligometastatic Solid Tumors: Primary Analysis of All Tumor-Histology Baskets of the Phase II Randomized EXTEND Trial.
Abstract
PURPOSE: We tested the hypothesis that adding metastasis-directed therapy (MDT) to standard of care (SOC) systemic therapy improves progression-free survival (PFS) among patients with oligometastatic disease.<br/><br/>METHODS: EXTEND was a multicenter randomized phase II trial. Patients with 1-5 metastases were randomized to MDT+SOC vs SOC in 1 of 6 baskets (breast, pancreas, kidney, two prostate baskets, and an "Other" basket) with basket-specific stratification and powering. PFS, the primary endpoint, was pre-specified in the per-protocol set within each basket, across all baskets, and across all baskets excluding the prostate baskets. Exploratory endpoints included circulating tumor DNA (ctDNA) and immune profiling.<br/><br/>RESULTS: From 2018 through 2023, 521 patients were screened, 350 were randomized, and 334 were analyzed per protocol (MDT+SOC, n=166; SOC, n=168). Radiotherapy was used as MDT for 98% of metastases (370/379). Overall, after median follow-up of 53 months, PFS was improved with MDT+SOC (HR 0.54, 95% CI 0.41 to 0.72, p < 0.001). Similarly, PFS was improved when excluding the prostate baskets (HR, 0.60; 95% CI: 0.40 to 0.89). Within each basket, PFS superiority was identified for the pancreas, prostate, and "Other" baskets, whereas the breast and kidney baskets were inconclusive. At enrollment, detectable ctDNA correlated with shorter PFS and survival; by contrast, ctDNA clearance 3-months post-enrollment correlated with improved survival. MDT+SOC-induced systemic immune activation was most pronounced among baskets demonstrating PFS superiority.<br/><br/>CONCLUSION: The phase II EXTEND trial supports the addition of MDT to SOC for oligometastatic disease. Histology-specific efficacy signals were identified for phase III testing. Translational insights suggest the potential for optimizing the definition of oligometastasis using ctDNA, and point to systemic immune responses as a possible mechanism of benefit from MDT.
📝 Sherry AD, Haymaker C, Wang S, Liu S, Bathala TK, Medina-Rosales MN, Seo A, Hara K, Reddy J, Chun SG, Mayo LL, Walker G, Pant S, Zhao D, Kovitz CA, Ramirez D, Ha CS, Smith BD, Gomez D, Cohen L, Koong AC, Reuben A, Tannir N, Corn PG, Tran PT, Siddiqui BA, Subudhi SK, Msaouel P, Ludmir EB, Tang C. Addition of Metastasis-Directed Therapy to Standard of Care for Oligometastatic Solid Tumors: Primary Analysis of All Tumor-Histology Baskets of the Phase II Randomized EXTEND Trial. J Clin Oncol. 2026 May 16:101200JCO2502856.
Early signal

FASTRACK II NCT02613819

ForPrimary RCC ≤10 cm, medically inoperable or declined surgery, N0-N1

Freedom from local progression local control

100% at 36, 60, and 84 mo

RECIST, intention-to-treat population; median f/u 62 mo

TL;DR100% freedom from local progression at 36, 60, and 84 months after single-fraction 26 Gy or 42 Gy/3fx SABR in inoperable primary RCC.

Why it mattersRadiation oncology

The size-adapted prescription is what transfers: 26 Gy × 1 for ≤4 cm, 42 Gy/3fx at 48 h intervals above that, in a cohort that was 65% T1b or higher (median 46 mm), not a small-tumour-enriched series. Two colonic obstructions place bowel as the constraint for central lesions.

10 details

Non-randomised phase 2, eight hospitals in Australia and the Netherlands (TROG 15.03, with ANZUP). Accrual July 28 2016 to Feb 27 2020: 71 enrolled, one withdrew consent before treatment, 70 treated. This report is the pre-planned final long-term follow-up, median 62 months (IQR 60-72).

Histologically confirmed primary RCC in pts who were medically inoperable, high risk, or declined surgery; ECOG ≤2; tumour ≤10 cm; N0-N1. Median age 77 (70-82), 70% male. Median tumour size 46 mm (37-55): T1a 34%, T1b 56%, T2a 9%, T3a 1%, with one N1 pt.

Size-adapted prescription: 26 Gy in a single fraction for tumours ≤4 cm, and 42 Gy in 3 fractions delivered 48 h apart for tumours >4 cm. No systemic therapy component.

Primary: freedom from local progression by RECIST, assessed in the intention-to-treat population, with safety co-assessed in ITT.

100% local control at 36, 60, and 84 months, with no local recurrences and no cancer-related deaths reported over median 62-month follow-up.

Seven pts (10%) had at least one treatment-related grade 3 event within 9 months: pain (abdominal/flank/tumour) 4 (6%), nausea and vomiting 3 (4%), colonic obstruction 2 (3%), diarrhoea 1 (1%). No grade 4 events, no treatment-related deaths, and no new long-term safety signals.

non-surgical primary RCC ≤10 cm, predominantly T1b or higher, in a median-age-77 cohort
Does not represent surgically fit pts for whom partial nephrectomy is standard, or tumours >10 cm.

Single-arm and non-randomised: no head-to-head against partial nephrectomy, cryoablation, or radiofrequency ablation, which is the live comparison in the surgery-declining subset. N=70 with one N1 pt leaves nodal disease essentially untested. Industry co-funding (Varian) alongside Cancer Australia.

The value here is durability rather than magnitude: a flat 100% at 84 months in a cohort with median 46 mm tumours argues the ablative dose is adequate for lesions well beyond the small-renal-mass range where thermal ablation is usually deployed. The bowel events, not renal function, define the practical constraint for central tumours on the 3-fraction schedule.

Single-arm phase 2; no randomised comparator vs nephrectomy or thermal ablation. Long f/u and 100% local control do not lift a non-randomised design.

For a medically inoperable or surgery-declining pt with a T1b-T2a primary RCC ≤10 cm, this supports SABR as a definitive local option with durable 84-month local control; it does not address the surgically fit pt in whom partial nephrectomy remains untested against SABR.

  • SABR vs partial nephrectomy in surgically fit pts
  • SABR vs thermal ablation for T1b tumours
  • Long-term renal function after single-fraction 26 Gy
📚 Sources · 📄 1 paper
📄 PAPER Siva; Pryor; Martin et al. · The Lancet. Oncology (2026-05)
Long-term outcomes of stereotactic ablative body radiotherapy for primary kidney cancer (TROG 15.03 FASTRACK II): a multicentre, non-randomised, phase 2 study.
Abstract
BACKGROUND: Stereotactic ablative body radiotherapy (SABR) is an emerging, non-invasive alternative for primary renal cell carcinoma. We aimed to provide the final long-term trial outcomes of TransTasman Radiation Oncology Group (TROG) 15.03 FASTRACK II, the first phase 2 trial investigating SABR for primary renal cell carcinoma to our knowledge.<br/><br/>METHODS: FASTRACK II was a non-randomised, phase 2 study conducted in eight hospitals in Australia and the Netherlands by TROG and the Australian and New Zealand Urogenital and Prostate (ANZUP) Cancer Trials Group. Here, we report the final pre-planned follow-up results. Adult patients (aged &#x2265;18 years) with histologically confirmed primary renal cell carcinoma, who were medically inoperable, high risk, or declined surgery, had an Eastern Cooperative Oncology Group performance status of 2 or less, had tumours 10 cm or less in size, and had N0-N1 disease were included. Patients underwent either a single fraction SABR of 26 Gy for tumours 4 cm or less in maximum diameter, or 42 Gy in three fractions delivered 48 h apart for tumours more than 4 cm in maximum diameter. The primary outcome was freedom from local progression to assess local control after SABR evaluated with the Response Evaluation Criteria in Solid Tumours. The primary endpoint and safety were evaluated in the intention-to-treat population. A patient representative was involved in the study design and conduct. The trial was registered with ClinicalTrials.gov (NCT02613819) and is closed to enrolment.<br/><br/>FINDINGS: Between July 28, 2016, and Feb 27, 2020, 71 patients were enrolled and one withdrew consent before treatment. Median follow-up was 62 months (IQR 60-72), median age was 77 years (70-82). 49 (70%) of 70 patients were male and 21 (30%) were female. Race and ethnicity data were not collected. The median tumour size was 46 mm (37-55), with 24 (34%) patients with T1a disease, 39 (56%) with T1b disease, six (9%) with T2a disease, and one (1%) with T3a disease. One patient (1%) had nodal involvement (N1). SABR resulted in 100% local control at 36 months, 60 months, and 84 months. Seven (10%) patients had at least one grade 3 adverse event within 9 months of SABR that was designated possibly, probably, or definitely related to treatment: nausea and vomiting (three [4%] events); abdominal, flank, or tumour pain (four [6%]); colonic obstruction (two [3%]); and diarrhoea (one [1%]). No new long-term safety signals, grade 4 events, or treatment-related deaths were noted.<br/><br/>INTERPRETATION: Long-term follow-up supports the safety and local control of SABR for non-surgical patients with renal cell carcinoma, with no observed local recurrences or cancer-related deaths in this cohort, which had predominantly T1b disease or higher.<br/><br/>FUNDING: The Cancer Australia Priority-driven Collaborative Cancer Research Scheme and Varian.
📝 Siva S, Pryor D, Martin J, Hardcastle N, Moon D, Kron T, Higgs B, Foroudi F, Ruben J, Sridharan S, Montgomery R, Davey R, Lin C, Shaw M, Lawrentschuk N, Appu S, Vanneste BGL, Hofman MS, Murphy DG, De Abreu Lourenco R, Mancuso P, Brook NR, Raman A, Wong LM, Sidhom M, Wood S, Ali M, Bressel M. Long-term outcomes of stereotactic ablative body radiotherapy for primary kidney cancer (TROG 15.03 FASTRACK II): a multicentre, non-randomised, phase 2 study. Lancet Oncol. 2026 May 17:S1470-2045(26)00091-4.
Caveats dominate

RADIOSA (MFS post-hoc)

ForOligorecurrent prostate cancer eligible for metastasis-directed SBRT

TL;DRPost-hoc MFS 16.6mo vs not reached, HR 0.39 favoring SBRT + 6mo ADT over SBRT alone in oligorecurrent prostate.

Why it mattersRadiation oncology

The additive read is the eugonadal MFS: benefit persisted after testosterone recovery (p<0.05), so the ADT effect is not just on-treatment suppression of imaging progression. That argues against reading RADIOSA's MFS split as a testosterone artifact, and moves the SBRT-alone vs SBRT + short-course ADT decision in oligorecurrence.

Also covered Jun 12

RADIOSA (MFS post-hoc)
EndpointArm A (SBRT)Arm B (SBRT + ADT)Effect size
Metastatic progression32/51 (62.7%)19/51 (37.3%)log-rank p=0.00079
Median MFS16.6 mo (95% CI 12.83-NA)not reachedHR 0.3894 (0.2201-0.6888), p=0.00119
+1 more figure
Methods: N=102 randomized 1:1; median follow-up 49.23 months (95% CI 42.47-54.8).
Methods: N=102 randomized 1:1; median follow-up 49.23 months (95% CI 42.47-54.8).
8 details 5 trials watching

Phase II randomized trial, 1:1, N=102, Arm A SBRT alone vs Arm B SBRT + 6-month ADT. Median follow-up (reverse KM) 49.23 months (95% CI 42.47-54.8). This report is a post-hoc analysis of MFS and eugonadal MFS.

Oligorecurrent prostate cancer. Detailed eligibility (number of lesions, imaging modality, prior local therapy, PSA thresholds) not reported in source.

SBRT to the oligorecurrent sites in both arms. Dose, fractionation, and target volume are not reported in source, which limits transfer to a specific practice.

MFS defined as randomisation to any M1 metastatic recurrence on imaging. Eugonadal MFS measured from testosterone recovery to new metastasis or last follow-up. KM curves compared by log-rank; HRs from Cox models.

Effect sizes are in the figure caption table. All Arm B pts except two reached testosterone recovery within follow-up.

oligorecurrent prostate cancer treated with metastasis-directed SBRT with or without 6-month ADT
Does not represent de novo metastatic, castration-resistant, or polymetastatic disease.

Post-hoc analysis; MFS was not the prespecified primary endpoint. No OS reported in source, so the surrogate carries the read. Toxicity and SBRT technique parameters absent from source.

The eugonadal analysis is the substantive contribution: separating the benefit from on-treatment castration addresses the standing objection that ADT simply delays imaging-detected progression. Whether that reflects durable synergy between ablation and transient androgen suppression, as the authors argue, is hypothesis-generating at N=102.

Post-hoc endpoint analysis of a phase II trial; MFS was not the prespecified primary. Design dominates the read despite the clean randomisation and mature follow-up.

In oligorecurrent prostate cancer being considered for metastasis-directed SBRT, this supports the discussion of adding 6-month ADT over SBRT alone; it does not address de novo metastatic or castration-resistant disease, and the SBRT dose and target volume are not stated in the source.

📚 Sources · 🐦 1 tweet
Early signal

OLIGOMA NCT04495309

ForOligometastatic breast, ≤5 lesions, any line, mostly ER+/HER2- first line

Progression-free survival (co-primary with QoL) surrogate

35.8 vs 20.4 mo, HR 0.48

95% CI 0.25-0.91, p=0.021

TL;DRmPFS 35.8 vs 20.4mo, HR 0.48 (0.25-0.91), p=0.021 for MDT to all lesions in oligometastatic breast, QoL non-inferior.

Why it mattersRadiation oncology

The RT read is who was actually irradiated: 2/3 of lesions were bone and >80% of pts had 1-3 mets, so this is largely bone-directed ablative RT in first-line ER+ disease, not a visceral-oligomet population. Dose and fractionation are not reported in source, which gates transfer to practice. QoL non-inferiority at 12wk (-2.1, margin -10) removes the main argument against adding local therapy to a working systemic backbone.

OLIGOMA
+3 more figures
OLIGOMA
ArmQLQ-C30 mean at 12wk (95% CI)Between-group change (ANCOVA)
Experimental72.2 (67.2-77.2)-2.1 (-9.2-5.1)
Control74.3 (69.3-79.3)n/a
OLIGOMA
OLIGOMA
9 details 5 trials watching

Randomised trial (ARO-2021-09, NCT04495309) of systemic therapy alone vs systemic therapy plus local ablative radiotherapy to all metastatic lesions. Randomisation stratified by type of systemic therapy and treatment line. N=87 (43 experimental, 44 control).

Metastatic breast cancer, any treatment line, maximum 5 metastatic lesions, with the systemic regimen determined by multidisciplinary tumour board. Pts requiring palliative RT to all metastases were not eligible, though palliative RT to symptomatic sites was allowed. Median age 58 / 59; ECOG 0 in 76.7% of the experimental arm.

The intervention is local ablative radiotherapy to all metastatic lesions on top of the systemic backbone. Dose, fractionation, modality, and target-volume definition are not reported in the source slides, and 2/3 of treated lesions were bone metastases.

Co-primary: progression-free survival and quality of life (EORTC QLQ-C30) at 12 weeks post-randomisation. Secondary: overall survival, toxicity, compliance, QLQ-C30 and QLQ-BR23, and patient satisfaction with cancer care (EORTC PATSAT C33).

Both co-primaries read out in favour of adding MDT: PFS separated at HR 0.48 and the QoL summary score met non-inferiority against a -10 point margin. See the figure captions for the arm-level values.

oligometastatic breast cancer with ≤5 lesions, predominantly ER+/HER2- disease in the first-line setting with 1-3 mostly bony metastases
Does not represent pts with >5 lesions, HER2+ or triple-negative disease in meaningful numbers, or pts whose entire metastatic burden requires palliative rather than ablative RT.

Recruitment stopped early at <20% of the initial and <40% of the amended target, leaving N=87 and a wide HR CI (0.25-0.91). Open-label design with a patient-reported co-primary. No OS data reported in source, and the toxicity secondary endpoint is likewise absent from the presented slides.

The presenter frames this as the first RCT showing a PFS benefit from MDT in oligometastatic breast cancer, extending the STOMP / SABR-COMET line of evidence into a histology where systemic control is comparatively good. Eight further randomised trials are accruing, so the magnitude here should be read as provisional.

Randomised but stopped early at <20% of initial accrual target; N=87 with wide HR CI (0.25-0.91). Underpowered for a durable PFS estimate.

In ER+/HER2- breast cancer with 1-3 mostly bony metastases on first-line systemic therapy, this supports discussing ablative RT to all lesions as a PFS-directed addition; it does not extend to >5 lesions, heavily visceral disease, or pts needing palliative RT to every site.

📚 Sources · 🐦 3 tweets
Early signal

EXTEND

ForOligometastatic solid tumors, mixed histology, on standard-of-care systemic…

TL;DRPrimary aggregated analysis across all tumor-histology baskets now published in JCO; no effect sizes reported in source tweet.

Why it mattersRadiation oncology

The aggregated all-basket read is the gate for whether MDT generalizes beyond the single histologies that carry their own randomized data, so it moves the offer-MDT-or-not decision in mixed-histology oligomet. No effect sizes, RT dose, fractionation, or target volume appear in the source text.

Also covered May 18

7 details

Phase II randomized trial of metastasis-directed therapy added to standard of care vs standard of care alone in oligometastatic solid tumors. This report is the primary analysis of all tumor-histology baskets pooled.

No effect sizes are reported in the source, which is a tweet plus a JCO title-page image. Primary endpoint, medians, HRs, and follow-up all require the full text.

Pooling across histology baskets can obscure heterogeneity between them. MDT technique, dose, fractionation, and target volume are not stated in source, so transferability to a specific RT practice cannot be judged here.

Phase II randomized basket design caps the read at hypothesis-generating; source gives no primary endpoint, effect size, or follow-up to classify further.

  • Which histology baskets drive the pooled estimate
  • Whether ctDNA selects pts who benefit from MDT
  • Confirmatory phase 3 in mixed-histology oligomet
📚 Sources · 🐦 1 tweet