At a median follow-up of 38 months after randomisation (IQR 24–50), 3-year progression-free survival was 80% (95% CI 70–87) in the lenalidomide group versus 64% (53–73) in the observation group (log-rank test p=0·012; hazard ratio 0·51, 95% CI 0·30–0·87)...lenalidomide after autologous HSCT improved progression-free survival in patients with mantle cell lymphoma, highlighting the role of maintenance in mantle cell lymphoma.