Statistical analysis
death
EVENT, SECOND MALIGNANCY
Event‐free survival (EFS) and overall survival (OS) were defined as the time from diagnosis to the occurrence of the qualifying event (relapse, second malignancy, or death for EFS and all‐cause mortality for OS). EFS and OS were also assessed from time of first relapse to occurrence of qualifying event since first relapse. Survival was evaluated using the Kaplan–Meier method,