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RMST — SCE Medical Oncology MCQ

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HardClinical Trials & StatisticsRMSTSCE Medical Oncology

A researcher is reviewing a cancer trial that reports its primary analysis using restricted mean survival time (RMST) instead of the hazard ratio. What advantage does RMST offer over the traditional Cox model/log-rank approach?

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Correct answer: C — RMST provides an absolute measure of survival benefit (difference in mean survival time) without requiring the proportional hazards assumption — making it more appropriate for immunotherapy trials with delayed curve separation

RMST (restricted mean survival time) calculates the area under the Kaplan-Meier curve up to a specified time point, providing an absolute measure of survival time difference. Unlike HR (which assumes proportional hazards), RMST does not require the PH assumption and provides a clinically interpretable difference in mean survival time. This is particularly relevant for immunotherapy trials where delayed separation of curves and crossing hazards violate the PH assumption. RMST is increasingly requested by regulatory agencies and used alongside HR.

Reference: JRCPTB Medical Oncology Curriculum; Trinquart et al JCO 2016; Royston et al BMC Medical Research Methodology 2013