CSF3 and acute myeloid leukemia: In this study, we performed a retrospective analysis using a nationwide Japanese database of a large cohort of adult AML patients treated with allogeneic bone marrow transplantation (BMT), peripheral blood stem cell transplantation (PBSCT), or single‐unit cord blood transplantation (CBT) to evaluate the impact of G‐CSF use and timing on posttransplant outcomes.