title: Randomized clinical trial of cystosine arabinoside and 6-thioguanine in remission induction and consolidation of adult nonlymphocytic acute leukemia.
abstract: One hundred and forty-seven adults with acute nonlymphocytic leukemia were randomized to one of two treatment regimens utilizing cytosine arabinoside and 6-thioguanine. In regimen A the drugs were administered every 12 hours until marrow cellularity was reduced by at least 50%. In regimen B the drugs were administered every 12 hours for 5 days with five to 7 days rest intervals between courses. Decisions to continue or reinstitute therapy were based solely on marrow cellularity and marrow ratings. The overall response in referee-verified cases in both groups was similar (41%); regimen B proved to be the easier protocol to administer but required greater support. Younger patients or those with an initial high hemoglobin count responded best to these drug regimens. Only 36% of our patients experienced severe marrow hypoplasia (i.e., a 75% or greater reduction in marrow cellularity) prior to complete remission, suggesting that cytosine arabinoside and 6-thioguanine in combination may selectively suppress leukemic cells while sparing normal hematopoietic elements.
mesh_terms: D000208:Acute Disease; D000293:Adolescent; D000328:Adult; D000368:Aged; D001853:Bone Marrow / Q000187:drug effects; D002986:Clinical Trials as Topic; D003561:Cytarabine / Q000008:administration & dosage / Q000009:adverse effects / Q000627:therapeutic use*; D004334:Drug Administration Schedule; D004359:Drug Therapy, Combination; D005260:Female; D006801:Humans; D007938:Leukemia / Q000188:drug therapy*; D008297:Male; D008875:Middle Aged; D012075:Remission, Spontaneous; D013866:Thioguanine / Q000008:administration & dosage / Q000009:adverse effects / Q000627:therapeutic use*
chemical_list: D003561:Cytarabine; D013866:Thioguanine