Minimal residual disease (MRD) is defined that there are residual leukemia cells in the range of 10~6-10~8 in the patients who are in complete remission (CR).

• 患者经治疗后,达到临床和血液学的完全缓解,体内仍有106-108个残留白血病细胞,称为微小残留病(minimal residual disease, MRD)。