Survival curve. (A) Progression-free survival (PFS). The median PFS of half-dose R-CHOP therapy was not reached, and the estimated 2-year PFS was 72% and 3-year PFS was 64%. The estimated 3-year second PFS by a bendamustine-containing regimen was 89%. (B) Overall survival (OS). The estimated 3-year OS was 96%.