RER is Rapid Early Responder. This is defined as M1 marrow (less than 5% blasts) on day 8 (or 15) and negative MRD status on day 29 (this is less than 0.1% MRD in the bone marrow).

SER is Slow Early Responder. This is defined as M2 or M3 marrow (greater than 5% blasts) on day 15 or postive MRD on day 29 (this is greater than 0.1% in the bone marrow).