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Prognostic impact of orotate phosphoribosyl transferase among 5‐fluorouracil metabolic enzymes in resectable colorectal cancers treated by oral 5‐fluorouracil‐based adjuvant chemotherapy
Author(s) -
Ochiai Takumi,
Nishimura Kazuhiko,
Noguchi Hajime,
Kitajima Masayuki,
Tsukada Akira,
Watanabe Emiko,
Nagaoka Isao,
Futagawa Shunji
Publication year - 2006
Publication title -
international journal of cancer
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.475
H-Index - 234
eISSN - 1097-0215
pISSN - 0020-7136
DOI - 10.1002/ijc.21779
Subject(s) - thymidylate synthase , dihydropyrimidine dehydrogenase , colorectal cancer , fluorouracil , medicine , oncology , chemotherapy , cancer , cancer research , endocrinology
Orotate phosphoribosyl transferase (OPRT) is the main enzyme that involves in phosphoribosylation of 5‐fluorouracil (5‐FU), an essential step that leads to tumor growth inhibition. In our study, the prognostic relevance of OPRT, thymidylate synthase (TS) and dihydropyrimidine dehydrogenase (DPD) in resectable colorectal cancer (CRC) patients treated by oral 5‐FU were compared to further clarify the prognostic value of OPRT. Tumor tissue was collected from 90 CRC patients and the patients were followed for 5.2 years (Median). TS, DPD and OPRT activities in the extract of tumor tissue were determined enzymatically. The cut‐off value of OPRT (0.147 nmol/(min mg), TS (0.044 pmol/mg) and DPD (72.10 pmol/(min mg) were determined by maximal χ 2 method. Among these 5‐FU metabolic enzymes, only high OPRT group demonstrated significantly better disease‐free survival (DFS) ( p = 0.0152) and better overall survival ( p = 0.0078). In Cox regression analysis, node status ( p < 0.0005) and OPRT ( p = 0.044) were significant factors for DFS. OPRT activity in tumor tissue was a predictor of prognosis in resectable CRC patients treated by oral 5‐FU‐based adjuvant chemotherapy, and was useful to pick‐up high risk patients independent from known prognosis factors. © 2006 Wiley‐Liss, Inc.