PFS and overall survival. Kaplan-Meier plots of progression-free survival (PFS; A) and overall survival (B) of older early-stage favorable HL patients treated with 2 cycles of AVD (HD13 trial; median observation time [MOT], 57 months), 2 cycles of ABVD (HD10 trial, MOT 84 months; HD13 trial, MOT 58 months) or 4 cycles of ABVD (HD10 trial, MOT 84 months). Pts, patients.