Kaplan-Meier survival curves for each cohort. (A) PFS and (B) OS of the entire cohort (red), CCD cohort (blue), and prospective cohort (green). The prospective cohort had superior PFS compared with the entire cohort (P = .02). There were no other significant differences in PFS or OS. Living patients were censored at time of last follow-up (filled circles). The number of patients at risk for each time point and cohort is shown.