RTOG 1112 NCT01730937
ForLocally advanced HCC unsuitable for local-regional therapy, 74% macrovascular invasion
15.8 vs 12.3 mo
HR 0.77, 90% CI 0.59-1.01, 1-sided P=.06 (did not meet)
TL;DRmOS 15.8 vs 12.3mo, HR 0.77 (90% CI 0.59-1.01), 1-sided P=.06; adjusted HR 0.72, P=.04; PFS HR 0.55.
The PFS signal is where SBRT earns its place: 9.2 vs 5.5 mo, HR 0.55 (95% CI 0.40-0.75), in a cohort 74% macrovascular-invasion positive, at 27.5 to 50 Gy in 5 fx with no excess G3+ toxicity (47% vs 42%, P=.52). That moves the add-SBRT-to-systemic decision in vascular-invasion HCC, even with sorafenib as the backbone.
In locally advanced HCC with macrovascular invasion who are unsuitable for or refractory to local-regional therapy, this supports adding 5-fraction SBRT to first-line systemic therapy; it does not address SBRT layered onto current IO-based regimens.
Personalized SBRT at 27.5 to 50 Gy in 5 fractions produced mPFS 9.2 vs 5.5 mo, HR 0.55 (95% CI 0.40-0.75), in a cohort 74% macrovascular-invasion positive, with G3+ toxicity indistinguishable from systemic therapy alone (47% vs 42%, P=.52). That is the case for offering liver SBRT alongside systemic therapy in vascular-invasion HCC.
The systemic backbone was fixed at sorafenib in both arms, so the OS and PFS deltas reflect the addition of RT, not drug choice. The open question for a med onc is sequencing: whether the HR 0.55 PFS gain persists on an IO-based first-line backbone, which is untested here.
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Multicenter phase 3 RCT, 1:1, stratified by performance status, liver function, degree of metastases and macrovascular invasion. 193 randomized, 177 eligible; accrual April 2013 to March 2021, stopped early once standard-of-care systemic therapy changed.
HCC unsuitable for or refractory to standard local-regional therapies and candidates for first-line systemic therapy. 150 of 177 (84.7%) male, median age 66 (IQR 60-72), macrovascular invasion in 131 (74.0%).
Personalized SBRT, 27.5 to 50 Gy in 5 fractions, delivered before sorafenib. The dose range is individualized rather than fixed, so the prescription reflects liver reserve and target geometry, not a single protocol dose.
Sorafenib in both arms; the experimental arm added SBRT first. The systemic backbone is identical, so the difference is attributable to radiation.
Primary: overall survival. Secondary: progression-free survival, adverse events, quality of life. The primary OS comparison was tested 1-sided with 90% CIs.
OS 15.8 vs 12.3 mo, HR 0.77 (90% CI 0.59-1.01), 1-sided P=.06; adjusted for stratification factors HR 0.72 (95% CI 0.52-0.99), 2-sided P=.04. PFS 9.2 vs 5.5 mo, HR 0.55 (95% CI 0.40-0.75), P<.001.
| Measure | Sorafenib | SBRT + sorafenib | P |
|---|---|---|---|
| Tx-related G3+ AE | 37 of 88 (42%) | 39 of 83 (47%) | P=.52 |
| Tx-related deaths | 2 | 1 | n/a |
| Improved QoL at 6 mo | 2 of 20 (10%) | 6 of 17 (35%) | n/a |
Treatment-related G3+ AEs 47% (39 of 83) with SBRT vs 42% (37 of 88) with sorafenib alone, P=.52. Treatment-related deaths: 2 sorafenib (unspecified, liver failure), 1 SBRT arm (lung infection).
The sorafenib comparator is the SHARP-era standard, and 1L HCC has since moved to IO-based combinations, which is why accrual closed. No randomised trial has yet tested SBRT against, or added to, those current regimens.
Early closure leaves the OS test underpowered, and the 2-sided P=.04 comes from the stratification-adjusted model rather than the primary unadjusted analysis. QoL was assessed in only 20 and 17 evaluable pts at 6 months, too few to weigh against the toxicity comparison.
The consistency between an OS HR of 0.77 and a PFS HR of 0.55 in a 74% macrovascular-invasion cohort argues the local effect is real and that OS dilution reflects competing liver and systemic events, not absence of benefit. What it does not settle is whether that local effect survives on top of a systemic backbone that already controls disease better than sorafenib did.
CONSORT flow
Randomised phase 3, prespecified OS primary, but 1-sided P=.06 misses and accrual closed early; comparator arm is sorafenib, now superseded.
- Does SBRT benefit persist on IO-based first-line systemic therapy recruiting Testing Immunotherapy With or Without Stereotactic Body Radiation Therapy in Patients With Advanced Liver Cancer, HELIO-RT Trial Phase 3n=226 · primary completion 2029-03 · phase 3 IO +/- SBRT in advanced HCC
- Optimal sequencing of SBRT relative to systemic therapy start not yet Second-line Systemic Therapy Combined with SBRT for HCC with Oligoprogression After Standard First-line Systemic Treatment Phase 2n=70 · primary completion 2026-10 · SBRT added at oligoprogression on 2nd-linerecruiting SBRT Plus Systemic Therapy vs Systemic Therapy Alone in BCLC C Hepatocellular Carcinoma Phase 2n=184 · primary completion 2027-11 · SBRT + systemic vs systemic alone, BCLC C, OS 1°
- Which macrovascular-invasion subgroups gain most from SBRT recruiting Atezolizumab Plus Bevacizumab Alone or Combined with External Beam Radiotherapy for HCC with Macrovascular Invasion Phase 2n=138 · primary completion 2026-03 · atezo/bev +/- EBRT to the invaded vesselrecruiting Using Radiotherapy and Immunotherapy to Treat Advanced Liver Cancer Before Transplant Phase 1/2n=48 · primary completion 2031-06 · Vp1-3 only, SBRT + atezo/bev to transplant
📚 Sources · 📄 1 paper
Abstract
The longer read
The result that matters here is not the primary endpoint but the distance between the two effect sizes. Progression-free survival moved with an HR of 0.55 and a 95% CI of 0.40 to 0.75, an unambiguous separation; overall survival moved with an HR of 0.77 and a 90% CI whose upper bound touches 1.01. That pattern is what one expects when a local intervention does exactly what it is supposed to do in a population whose competing risks are large. Three quarters of these pts had macrovascular invasion, and in that setting death arrives by several routes, only one of which SBRT can obstruct. Reading the missed 1-sided P=.06 as evidence that SBRT does not help inverts the logic of the trial.
Still, the adjusted analysis deserves scepticism rather than relief. Adjusting for stratification factors produced an HR of 0.72 with a 2-sided P of .04, and it is tempting to treat that as the true answer that the primary test failed to reach. It is not. The stratified model was not the primary test, and a trial that closes accrual early is exactly the setting where a secondary analytic framing crossing the conventional threshold should move confidence less than it appears to. What should move confidence is the internal coherence: a large PFS effect, a directionally concordant OS effect, and a toxicity profile that does not pay for either. Treatment-related grade 3 or higher events were 47 percent with SBRT versus 42 percent without, a difference that does not distinguish the arms, and there was one treatment-related death in the SBRT arm against two in the control. A local therapy that buys nearly four months of median PFS without a toxicity penalty in a cirrhotic population is a favourable trade on its face.
The harder problem is the comparator. Accrual stopped because first-line systemic therapy for HCC changed underneath the trial, and sorafenib is no longer the backbone anyone builds on. This does not make the RT question obsolete, but it changes what the trial can answer. Sorafenib exerted weak disease control, which maximises the room a local therapy has to contribute; a backbone with better systemic control compresses that room, and the PFS advantage could shrink accordingly. It could also grow, if better systemic control means pts live long enough for in-liver progression to become the dominant event. Both readings are consistent with these data, and nothing in this trial adjudicates between them.
For practice, the prescription itself is unusually transferable. Personalized SBRT at 27.5 to 50 Gy in 5 fractions is a range, not a dose, which reflects the reality that liver reserve and target geometry rather than tumour biology set the ceiling in HCC. A department already delivering liver SBRT can reproduce this without protocol-specific technique. The decision this trial informs is whether to offer SBRT to a patient with macrovascular invasion who has exhausted or never qualified for local-regional therapy and is starting systemic treatment, and the answer it supports is yes, with the caveat that the evidence for the combination is anchored to a systemic agent no longer in first-line use. What would have to be true for this to be wrong is that the PFS benefit is driven by radiographic in-field change rather than clinically meaningful disease control, or that the same intervention layered on modern systemic therapy adds toxicity in a liver already stressed by an immune-based regimen. Neither is addressed by these data.