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Prognostic Value of Tumoral Thymidylate Synthase and p53 in Metastatic Colorectal Cancer Patients Receiving Fluorouracil-Based Chemotherapy: Phenotypic and Genotypic Analyses

From the Centre Antoine Lacassagne and Centre Hospitalier Universitaire, Nice; L’Institut National de la Santé et de la Recherche Médicale U490, Paris; Institut Paoli Calmette, Marseille; Centre Hospitalier Universitaire, Grenoble; Centre Hospitalier Universitaire, Clermont-Ferrand, France.

Address reprint requests to Gerard Milano, PhD, Laboratoire d’Oncopharmacologie, Centre Antoine Lacassagne, 33 Av de Valombrose, 06189 Nice Cedex 2, France; email: gerard.milano{at}nice.fnclcc.fr

PURPOSE: The aim of this multicenter prospective study was to evaluate the role of intratumoral parameters related to fluorouracil (FU) sensitivity in 103 metastatic colorectal cancer patients receiving FU–folinic acid.

PATIENTS AND METHODS: Liver metastatic biopsy specimens were obtained for all patients and primary tumor biopsy specimens for 54 patients. Thymidylate synthase (TS), folylpolyglutamate synthetase, and dihydropyrimidine dehydrogenase were measured by radioenzymatic assays; TS promoter polymorphism (2R/2R v 2R/3R v 3R/3R) was determined by polymerase chain reaction; and p53 protein and mutations were analyzed by immunoluminometric assay and denaturing gradient gel electrophoresis, respectively.

RESULTS: p53 mutations were observed in 56.7% of metastases. TS activity was significantly higher in 2R/3R tumors as compared with 2R/2R or 3R/3R. TS activity in metastasis was the only parameter linked to clinical responsiveness (responders exhibited the lower TS, P = .047). Univariate Cox analyses demonstrated that TS activity in primary tumor (the greater the TS, the poorer the survival; P = .040), TS promoter polymorphism in primary tumor (risk of death of 2R/3R v 2R/2R, 2.68; P = .035), and p53 stop mutation in metastasis (risk of death of stop mutations v wild type, 3.14; P = .018) were the only significant biologic predictors of specific survival. Stepwise analysis did not discriminate between TS activity and TS polymorphism.

CONCLUSION: Present results confirm the value of tumoral TS activity for predicting FU responsiveness, point out the importance of detailed p53 mutation analysis for predicting survival, and suggest that TS genotype in primary tumor carries a prognostic value similar to that of TS activity.

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