title: Effect of L-asparaginase therapy for acute lymphoblastic leukemia on plasma vitamin K-dependent coagulation factors and inhibitors.
abstract: Vitamin K-dependent proteins were measured sequentially by immunoassay in eight patients with acute lymphoblastic leukemia receiving L-asparaginase (1000 U/kg/day) for 10 days as induction therapy, in combination with vincristine or vindesine, daunorubicin, cyclophosphamide, and prednisone. The level of each protein was significantly decreased during L-asparaginase therapy, but both the time course of change and the severity of decrease differed among the proteins. The decrease in protein C, factor IX, and factor X was observed earlier than the decrease in protein S and factor II. In the first days of L-asparaginase therapy the protein C level was significantly lower than those of the other vitamin K-dependent proteins. The transient imbalance in the levels of plasma vitamin K-dependent proteins observed in the first days of treatment may contribute to the risk of thrombosis associated with L-asparaginase therapy.
mesh_terms: D000293:Adolescent; D001215:Asparaginase / Q000494:pharmacology / Q000627:therapeutic use*; D001777:Blood Coagulation / Q000187:drug effects*; D001779:Blood Coagulation Factors / Q000378:metabolism; D002648:Child; D002675:Child, Preschool; D004797:Enzyme-Linked Immunosorbent Assay; D006023:Glycoproteins / Q000378:metabolism; D006801:Humans; D007945:Leukemia, Lymphoid / Q000097:blood / Q000188:drug therapy*; D008297:Male; D011486:Protein C; D017293:Protein S; D014812:Vitamin K / Q000502:physiology
chemical_list: D001779:Blood Coagulation Factors; D006023:Glycoproteins; D011486:Protein C; D017293:Protein S; D014812:Vitamin K; D001215:Asparaginase