title: Predictive value of GADD153, p21 and c-Jun for chemotherapy response in gastric cancer.
abstract: We sought to determine whether changes in the expression of early response genes (GADD153, p21 and c-Jun) are indicators of chemotherapy response in gastric cancer. Three human gastric cancer cell lines were exposed to 5-fluorouracil or cisplatin in vitro. Xenografts of TMK-1 cells in nude mice were also treated with 5-fluorouracil or cisplatin in vivo. For each of these treatments, we tested for a correlation between early gene expression levels and inhibition ratios derived at a later time. A 5-fluorouracil derivative, S-1, and cisplatin were administered to 12 patients with advanced gastric cancer for 3 weeks. Gene expression levels were measured using biopsy specimens obtained by endoscopy soon after initiation of chemotherapy. There was a significant correlation between expression levels of these genes at 24 h and inhibition ratios at 72 h in vitro. Cut-off values determined from receiver-operating characteristic curves were 1.3 for GADD153, 1.8 for p21 and 2.1 for c-Jun There was also a significant correlation between gene expression levels at 2 days and inhibition ratios at 21 days in vivo. Cut-off values were 1.8 for GADD153, 1.9 for p21 and 2.2 for c-Jun. Levels of early response gene expression in patients showing progressive disease were significantly lower than those in patients with partial response. Changes in the expression of the three early response genes soon after drug administration could improve predictions of the final outcome of chemotherapy in gastric cancer.
authors.affiliation: Department of Surgery, Keio University, School of Medicine, 35 Shinanomachi Shinjuku Tokyo, 160-8582 Japan.
authors.forename: Yukako
authors.initials: Y
authors.lastname: Akatsu
authors.forename: Yoshiro
authors.initials: Y
authors.lastname: Saikawa
authors.forename: Tetsuro
authors.initials: T
authors.lastname: Kubota
authors.forename: Tomotaka
authors.initials: T
authors.lastname: Akatsu
authors.forename: Masashi
authors.initials: M
authors.lastname: Yoshida
authors.forename: Yuko
authors.initials: Y
authors.lastname: Kitagawa
authors.forename: Yoshihide
authors.initials: Y
authors.lastname: Otani
authors.forename: Koichiro
authors.initials: K
authors.lastname: Kumai
authors.forename: Masaki
authors.initials: M
authors.lastname: Kitajima
mesh_terms: D000818:Animals; D000970:Antineoplastic Agents / Q000494:pharmacology*; D045744:Cell Line, Tumor; D002470:Cell Survival / Q000187:drug effects; D002945:Cisplatin / Q000494:pharmacology; D050759:Cyclin-Dependent Kinase Inhibitor p21 / Q000235:genetics*; D004305:Dose-Response Relationship, Drug; D005260:Female; D005472:Fluorouracil / Q000494:pharmacology; D015972:Gene Expression Regulation, Neoplastic / Q000187:drug effects; D006801:Humans; D048031:JNK Mitogen-Activated Protein Kinases / Q000235:genetics*; D051379:Mice; D008807:Mice, Inbred BALB C; D008819:Mice, Nude; D011237:Predictive Value of Tests; D013274:Stomach Neoplasms / Q000188:drug therapy* / Q000235:genetics / Q000473:pathology; D013997:Time Factors; D051742:Transcription Factor CHOP / Q000235:genetics*; D023041:Xenograft Model Antitumor Assays
chemical_list: D000970:Antineoplastic Agents; C493956:CDKN1A protein, human; D050759:Cyclin-Dependent Kinase Inhibitor p21; C497249:DDIT3 protein, human; D051742:Transcription Factor CHOP; D048031:JNK Mitogen-Activated Protein Kinases; D002945:Cisplatin; D005472:Fluorouracil