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Subgroup analysis of overall survival and progression-free survival (PFS) according to RET mutation status, RET M918T status, and RAS mutations status. Data cut-off was 28 August 2014 for overall survival and 6 April 2011 for PFS. aAnalyses for all patients were stratified by randomization stratification factors, and analyses of subgroups were unstratified. HR, hazard ratio; CI, confidence interval. Methods for determining RET and RAS mutation status are described elsewhere [16].
