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- W3000612013 abstract "ABSTRACT Background The potential benefit of adding CTX to the current standard treatment for stage III CC, was assessed. Subgroup analyses of demographic, oncologic and molecular data may improve our understanding of this patient population. Methods CC pts were randomized 28-56 days following resection. They received 12 biweekly cycles of oxaliplatin 85 mg/m2 day (d) 1, with leucovorin 200 mg/m2, 5-FU 400 mg/m2 bolus IV, followed by 5-FU 600 mg/m2 22-hr IV on d1-2 (FOLFOX4), without (arm A) or with weekly CTX (arm B) 250 mg/m2 (initial dose 400 mg/m2, cycle 1). Primary endpoint was disease free survival time (DFS). Secondary endpoints included overall survival (OS), treatment compliance and safety. Planned accrual of 1,407 KRAS wild-type (wt) pts provided 90% power to detect a hazard ratio (HR) of 0.75 with 2-sided a = 0.05, with interim analyses after 65% of planned events. Preplanned subgroup analyses were performed. Results 1,602 KRAS wt pts (811 arm A, 791 arm B), were randomized. BRAF status was determined in 1134 (71%) KRAS wt pts; median follow-up ∼40 months. This interim analysis showed no difference between arms for DFS (HR 1.047, 95% CI 0.85, 1.29; p = 0.66) or OS (HR 1.09, 95% CI 0.81, 1.46; p = 0.55) in KRAS wt pts or for DFS (HR 0.985, 95% CI 0.75, 1.28; p = 0.91) or OS (HR 0.98, 95% CI 0.67, 1.44; p = 0.92) in KRAS/BRAF wt pts (n = 984). Worse outcomes were seen with CTX in pts >70 years (n = 149, DFS: HR 1.97, 95% CI 0.99, 3.93; p = 0.051), in females (n = 666, HR 1.45, 95% CI 1.03, 2.02; p = 0.03) and pts with right-sided CC (n = 570, HR 1.40, 95% CI 1.01, 1.94; p = 0.04). Conversely, a trend towards a better outcome was seen in pts with poor prognosis tumors (high grade, T4, N2, perforation/obstruction, VELI+) and was significant in pts with pT4N2 at diagnosis (n = 146, HR 0.55, 95% CI 0.35-0.88; p = 0.01). Conclusions In this trial adding CTX to FOLFOX4 offered no benefit to pts with resected stage III KRAS wt and KRAS/BRAF wt CC. Subgroup analyses in this large population suggest that pts with pT4N2 tumors may receive some benefit from CTX in this setting. MSI status determination is ongoing to explore its interaction with poor outcome in female pts and those with right-sided tumors. Supported by Merck-Serono, Sanofi-Aventis. Disclosure J. Tabernero: Participated at a Merck KGaA board G. Folprecht: -Honoraries, for lectures and advisory boards from Merck KGaA and Bristol Mayers Squibb. -Study grant from Merck KGaA -Involved in clinical trials with Imclone and Merck KGaA E.J.D. Van Cutsem: Eric Van Cutsem received research funding from Merckserono. P. Rougier: Consultancy/advisory role and honoraria Merck KGaA. O. Bouche: Membership on an advisory board P. Laurent-Puig: Membership on an advisory board of Merck Serono and Amgen. All other authors have declared no conflicts of interest." @default.
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- W3000612013 date "2012-09-01" @default.
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- W3000612013 title "Adjuvant Folfox4 with or without Cetuximab (CTX) in Patients (PTS) with Resected Stage III Colon Cancer (CC): Dfs and OS Results and Subgroup Analyses of the PETACC8 Intergroup Phase III Trial" @default.
- W3000612013 doi "https://doi.org/10.1016/s0923-7534(20)34317-9" @default.
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