title: Quantitative double-fluorescence immunohistochemistry (qDFIHC), a novel technology to assess protein expression: a pilot study analyzing 5-FU sensitive markers thymidylate synthase, dihydropyrimidine dehydrogenase and orotate phosphoribosyl transferases in gastric cancer tissue specimens.
abstract: To evaluate the protein expression level in formalin-fixed cancer tissue specimens, the authors devised quantitative double-fluorescence immunohistochemistry (qDFIHC). Using this method, the 17 gastric cancer biopsy specimens, before undergoing S-1 based neoadjuvant chemotherapy, were assessed in order to determine the expression levels of the thymidylate synthase (TS), orotate phosphoribosyltransferase (OPRT) and dihydropyrimidine dehydrogenase (DPD) which determines S-1 efficacy. The ratios of OPRT/TS, OPRT/DPD and OPRT/(DPD+TS) which have been proposed to show a good correlation with S-1 efficacy, were calculated and compared with the clinical response. A significant difference was thus observed in OPRT/TS (P=0.0049), OPRT/DPD (P=0.0067) and OPRT/(DPD+TS) (P=0.0013) between the responder and the non-responder groups. Therefore, the ratios assessed by qDFIHC may be a potentially effective predictor of the S-1 efficacy. Furthermore, qDFIHC may also be a useful method for assessing various protein levels in cancer tissues.
authors: Department of Surgery, Saga University, Faculty of Medicine, 5-1-1, Nabeshima, Saga-City, Saga, Japan.
authors: Keita
authors: K
authors: Kai
authors: Yoshihiko
authors: Y
authors: Kitajima
authors: Masatsugu
authors: M
authors: Hiraki
authors: Seiji
authors: S
authors: Satoh
authors: Masayuki
authors: M
authors: Tanaka
authors: Yuji
authors: Y
authors: Nakafusa
authors: Osamu
authors: O
authors: Tokunaga
authors: Kohji
authors: K
authors: Miyazaki
mesh_terms: D000368:Aged; D000971:Antineoplastic Combined Chemotherapy Protocols / Q000627:therapeutic use*; D014408:Biomarkers, Tumor / Q000378:metabolism*; D002945:Cisplatin / Q000008:administration & dosage; D042943:Dihydrouracil Dehydrogenase (NADP) / Q000378:metabolism*; D005260:Female; D005453:Fluorescence; D005472:Fluorouracil / Q000008:administration & dosage; D006801:Humans; D007124:Immunoenzyme Techniques; D008297:Male; D008875:Middle Aged; D020360:Neoadjuvant Therapy; D009962:Orotate Phosphoribosyltransferase / Q000378:metabolism*; D017239:Paclitaxel / Q000008:administration & dosage; D010865:Pilot Projects; D011379:Prognosis; D013274:Stomach Neoplasms / Q000188:drug therapy / Q000201:enzymology* / Q000473:pathology; D013940:Thymidylate Synthase / Q000378:metabolism*
chemical_list: D014408:Biomarkers, Tumor; D042943:Dihydrouracil Dehydrogenase (NADP); D013940:Thymidylate Synthase; D009962:Orotate Phosphoribosyltransferase; D017239:Paclitaxel; D002945:Cisplatin; D005472:Fluorouracil