Outcome of ALCL patients according to quantitative PCR results for NPM-ALK in bone marrow. (A) Cumulative incidence of relapse and Kaplan-Meier estimates of (B) event-free survival and (C) overall survival of the 74 patients with either a negative qualitative BM PCR or a positive qualitative BM PCR using quantitative PCR results and a NPM-ALK cutoff copy number of 10/10⁴ copies ABL (NCN).