title: Prediction of clinical response to 5-fluorouracil-containing chemotherapy: preliminary results of in vitro assay in human breast cancer.
abstract: An in vitro assay system measuring the production of phosphorylated nucleotide products of 5-FU by human tumor cytosols is described. Samples from 11 patients with breast cancer treated with 5-FU-containing chemotherapy regimens were assayed. Significant differences were seen in quantitative and qualitative patterns of phosphorylation between samples from chemotherapy responding and nonresponding patients. The rate of 5-fluorodeoxyuridylate production and the amount of nucleotide triphosphate produced were significantly P < 0.05 increased in chemotherapy-responding patients. This in vitro assay system is a simple, reproducible procedure that requires further evaluation as a potential system for prospectively predicting clinical response to fluorinated pyrimidines.
mesh_terms: D001943:Breast Neoplasms / Q000188:drug therapy* / Q000648:ultrastructure; D003600:Cytosol / Q000378:metabolism; D005260:Female; D005468:Fluorodeoxyuridylate / Q000378:metabolism; D005472:Fluorouracil / Q000378:metabolism / Q000627:therapeutic use*; D006801:Humans; D066298:In Vitro Techniques
chemical_list: D005468:Fluorodeoxyuridylate; D005472:Fluorouracil