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[Comment] ICON-6: the danger of changing study design midstream

Jonathan Ledermann and colleagues1,2 report the ICON-6 randomised trial findings for the tyrosine kinase inhibitor cediranib in relapsed platinum-sensitive ovarian cancer. Cediranib offered the prospect of improved efficacy with tolerable side-effects, and ICON-6 was a pragmatic trial to provide real-world evidence of the effectiveness, safety, and acceptability of cediranib plus chemotherapy (either concurrent or concurrent plus maintenance as long as patients were deriving benefit), compared with chemotherapy plus placebo.