title: [Estimation of level of enzyme induction of thymidine phosphorylase, dihydropyrimidine dehydrogenase, and thymidylate synthase in primary and recurrent breast cancer].
abstract: Several enzymes are closely related with the mechanism of action of fluoropyrimidine (FP). Dihydropyrimidine dehydrogenase (DPD) which catalyzes 5-fluorouracil (5-FU), thymidine phosphorylase (TP), responsible for catalyzing doxifluridine to 5-FU, and thymidylate synthase (TS) were estimated for breast cancer. TP level determined by enzyme-linked immunoabsorbant assay (ELISA), DPD level by ELISA and catalytic assay and TS level by fluorodeoxyuridine monophosphate (FdUMP) binding assay were estimated for 210 specimens from 125 consenting patients with primary or metastatic breast cancer who gave consent. TS level of T1 was higher than that of T2-4 (p < 0.05). A high positive correlation was observed between TP and DPD in the same specimen. The ratio of simultaneously resected metastasis/primary and postoperative recurrent/primary never exceeded two. Enzyme level, generally decreased with or without interventing FP therapy. Enzyme level increase was frequently observed in a series of no-drug, non-FP, and FP therapy regimens. For selection of chemotherapy or estimation of chemosensitivity, TS can be used, with either TP or DPD at first surgery, and also with intervening chemotherapy after recurrence.
authors.affiliation: Second Dept. of Surgery, Osaka City University Medical School.
authors.forename: Ken
authors.initials: K
authors.lastname: Morimoto
authors.forename: Masae
authors.initials: M
authors.lastname: Koh
mesh_terms: D000328:Adult; D000368:Aged; D000971:Antineoplastic Combined Chemotherapy Protocols / Q000627:therapeutic use; D001943:Breast Neoplasms / Q000188:drug therapy / Q000201:enzymology* / Q000473:pathology; D003520:Cyclophosphamide / Q000008:administration & dosage; D042943:Dihydrouracil Dehydrogenase (NADP) / Q000378:metabolism*; D004317:Doxorubicin / Q000008:administration & dosage; D004797:Enzyme-Linked Immunosorbent Assay; D005260:Female; D005472:Fluorouracil / Q000008:administration & dosage; D006801:Humans; D008207:Lymphatic Metastasis; D008875:Middle Aged; D009364:Neoplasm Recurrence, Local / Q000201:enzymology* / Q000473:pathology; D013629:Tamoxifen / Q000008:administration & dosage; D013939:Thymidine Phosphorylase / Q000378:metabolism*; D013940:Thymidylate Synthase / Q000378:metabolism*
chemical_list: D013629:Tamoxifen; D004317:Doxorubicin; D003520:Cyclophosphamide; D042943:Dihydrouracil Dehydrogenase (NADP); D013940:Thymidylate Synthase; D013939:Thymidine Phosphorylase; D005472:Fluorouracil