The possibility of predicting the efficacy of cancer chemotherapy in the prolongation of survival.
D001943:Breast Neoplasms; D002648:Child; D002675:Child, Preschool; D005500:Follow-Up Studies; D006801:Humans; D007945:Leukemia, Lymphoid / Q000188:drug therapy* / Q000401:mortality*; D015122:Mercaptopurine / Q000627:therapeutic use*; D011379:Prognosis
D015122:Mercaptopurine