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- W3030225867 abstract "4011 Background: The IDEA collaboration for high-risk stage 2 colorectal cancer patients (pts) demonstrated that for CAPOX, 3 months was non-inferior to 6 months treatment, while for FOLFOX, 6 months was superior to 3 months treatment. We investigated the impact of high risk features on disease-free survival (DFS). Methods: ACHIEVE-2, one of the 4 IDEA studies (SCOT, TOSCA, ACHIEVE-2, HORG), was an open-label, multicenter randomized trial for high-risk stage II colon cancer. High risk features are defined as one or more: T4, inadequate nodal harvest < 12, poorly differentiated, clinical sign of obstruction and perforation or vascular invasion. The association of high risk features with DFS were measured by Cox regression analyses. Results: Between 2014 and 2017, ACHIEVE-2 enrolled 525 pts, out of whom 514 pts were the modified ITT (mITT) population; 432 received CAPOX (84.0%) and 82 did mFOLFOX6 (16.0%). High-risk features included 35.8% of T4, 12.8% of inadequate nodal harvest, 11.5% of poorly differentiated, 19.3% of obstruction, 6.4% of perforation and 87.5% of vascular invasion; 47.3% had one features, 35.2% had two, 14.6% had three, and 2.9% had four or more. With a median follow-up of 36.1 months, 3-year DFS rates were 88% in both arms, with a hazard ratio (HR) of 1.12 (95% CI, 0.67-1.87, p=0.67). In multivariate analysis, T4 (HR 3.77 [2.18-6.53], p< 0.0001) and inadequate nodal harvest (HR 2.98 [1.59-5.59], p= 0.0006) remained independent significant negative prognostic factors. The 3-year DFS rates in T4 and Non-T4 diseases were 78% and 94% (p<0.0001), while 3-year DFS rate in pts with inadequate and adequate nodal harvest were 77% and 90% (p=0.0059). No interaction was observed between treatment duration and T4 or inadequate nodal harvest. Conclusions: Our findings indicated the relative impact of high risk features on DFS varies across factors; T4 and inadequate nodal harvest < 12 were more significant than the others. Our results must be interpreted within the combined analysis as well as within the reproducibility of results across the 4 trials. Clinical trial information: 000013036 ." @default.
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- W3030225867 date "2020-05-20" @default.
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- W3030225867 title "Impact of high-risk features on disease-free survival (DFS) in patients (pts) with high-risk stage II colon cancer (CC) in ACHIEVE-2 trial as part of the IDEA collaboration." @default.
- W3030225867 doi "https://doi.org/10.1200/jco.2020.38.15_suppl.4011" @default.
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