Trial reportBJS open2025
Neoadjuvant FOLFOXIRI plus bevacizumab without radiotherapy for high-risk rectal cancer: multicentre phase II trial.
Trial report in BJS open, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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12 authors.
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Abstract
backgroundThe optimal neoadjuvant strategy for high-risk locally advanced rectal cancer (LARC) remains a matter of debate. This study evaluated the efficacy and safety of neoadjuvant FOLFOXIRI (fluorouracil, leucovorin, oxaliplatin, irinotecan) plus bevacizumab without radiotherapy in patients with magnetic resonance imaging-defined high-risk LARC.
methodsA prospective, multicentre, single arm phase II trial was conducted in four Japanese Institutions between 2018 and 2024, enrolling patients with rectal adenocarcinoma and at least one high-risk criterion: clinical T4, lateral pelvic lymph node metastasis, mesorectal fascia involvement, or positive extramural vascular invasion. Patients received four cycles of FOLFOXIRI plus bevacizumab, followed by two cycles of FOLFOXIRI alone, before total mesorectal excision. The primary endpoint was pathological complete response (pCR); secondary endpoints included the R0 resection rate, local recurrence (LR), recurrence-free survival (RFS), overall survival (OS), and safety.
resultsOF 50 eligible patients, 31 were enrolled before early trial closure due to a slow accrual (accrual rate 62%). All patients underwent surgery. The pCR rate was 10% (3 of 31) and R0 resection was achieved in 97% (30 of 31) of patients. The median follow-up was 36.7 months. The 3-year cumulative LR rate was 3%, with 3-year RFS and OS rates of 73 and 81%, respectively. Grade ≥ 3 neutropenia occurred in 29% of patients, with acceptable toxicity overall. No cases of gastrointestinal perforation were observed. Grade ≥ III postoperative complications occurred in seven patients (23%), with the most frequent events being anastomotic leakage in two patients (7%).
conclusionsIn this phase II trial, although recruitment was suboptimal, neoadjuvant FOLFOXIRI plus bevacizumab achieved good local control without radiotherapy in patients with high-risk LARC. Although the pCR rate was modest compared with radiotherapy-based regimens, this chemotherapy-only approach may represent a reasonable option for select patients who are not suitable candidates for pelvic radiotherapy. Registration number: UMIN000037367 (https://www.umin.ac.jp/english/).
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