Risk of post-HCT relapse and leukemia-specific mortality based on MRD_pre and MRD_post levels. HRs for (A) post-HCT relapse and (B) post-HCT leukemia-specific mortality from a cause-specific Cox proportional hazards model, with MRD_pre as a fixed covariate and MRD_post as a time-varying covariate.