Immunohistochemical and clinicopathological study of thymidylate synthase, dihydropyrimidine dehydrogenase, and orotate phosphoribosyl transferase expression in oral cancer patients responding to UFT

Department of Oral and Maxillofacial Surgery, Unit of Translational Medicine, Course of Medical and Dental Sciences, Nagasaki University Graduate School of Biomedical Sciences.
Gan to kagaku ryoho. Cancer & chemotherapy 06/2010; 37(6):1035-9.
Source: PubMed


Thymidylate synthase(TS), dihydropyrimidine dehydrogenase(DPD), and orotate phosphoribosyl transferase(OPRT)are initial key enzymes in the 5-fluorouracil(5-FU)metabolic pathway. In this study, we investigated clinicopathological and immunohistochemical expressions of TS, DPD, and OPRT in oral cancer patients who showed a complete response(CR)to UFT. We also evaluated patients showing a partial response(PR)and stable disease(SD)following UFT. The numbers of CR, PR, and SD cases were 3, 5, and 10, respectively. Pathologically, all CR and PR cases were the well-differentiated type, and 5 out of 10 SD cases were of the moderately or poorly-differentiated type. Three out of the 5 cases of moderately or poorlydifferentiated type were DPD-negative. Most cases of CR and PR were DPD-positive. OPRT expression showed no difference with the UFT response. We suggest that UFT affects high DPD patients with the well-differentiated type, but may not influence low DPD patients with the moderately or poorly-differentiated type.

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