title: [Prediction of response to neoadjuvant chemotherapy in Barrett's carcinoma by quantitative gene expression analysis].
abstract: The potential of gene expression profiles to predict the response to neoadjuvant chemotherapy in patients with advanced adenocarcinoma of the esophagus was analyzed. Paraffin-embedded endoscopic esophageal tumor biopsies of 38 patients with advanced esophageal adenocarcinoma (Barrett's adenocarcinoma) were included. All patients underwent two cycles of cisplatin and fluorouracil (5-FU) therapy with or without additional paclitaxel (taxol) followed by abdominothoracal esophagectomy. RNA expression levels of 5-FU-metabolism associated genes thymidylate synthase (TS), thymidine phosphorylase (TP), dihydropyrimidine dehydrogenase (DPD), methylenetetrahydrofolate reductase (MTHFR), MAP7, ELF3, as well as of platinum and taxane associated related genes caldesmon, excision cross-complementing genes (ERCC1 and ERCC4) HER2-neu, DNA damage-inducible gene 45 (GADD45) and multidrug resistance genes (MDR1, MRP1) were determined using real-time RT-PCR. Expression levels were correlated with the histopathological response to chemotherapy assessed in surgically resected specimens. Responding patients showed significantly higher pretherapeutic expression levels of MTHFR (p = 0.012), Caldesmon (p = 0.016), MRP1 (p = 0.007) and MDR1 (p = 0.025). In addition, patients with high pretherapeutic MTHFR and MRP1 levels had a survival benefit after surgery (p = 0.013 and p = 0.015, respectively). Additionally, intratumoral heterogeneity of gene expression of selected genes (TP, DPD, MTHFR, HER2-neu, Caldesmon, ERCC4, MRP1) was additionally verified in 9 untreated Barrett's adenocarcinoma by examination of 5 distinct tumor areas and was observed in 12.7% (5.6%-23.5%, CI 95%) of all cases analyzed. Our results indicate that determination of mRNA levels of a few genes may be useful for the prediction of the success of neoadjuvant chemotherapy in individual cancer patients with advanced adenocarcinoma of the esophagus.
authors.affiliation: Institut für Pathologie der TU München.
authors.forename: R
authors.initials: R
authors.lastname: Langer
authors.forename: K
authors.initials: K
authors.lastname: Specht
authors.forename: K
authors.initials: K
authors.lastname: Becker
authors.forename: P
authors.initials: P
authors.lastname: Ewald
authors.forename: M
authors.initials: M
authors.lastname: Sarbia
authors.forename: R
authors.initials: R
authors.lastname: Busch
authors.forename: M
authors.initials: M
authors.lastname: Feith
authors.forename: H J
authors.initials: HJ
authors.lastname: Stein
authors.forename: J R
authors.initials: JR
authors.lastname: Siewert
authors.forename: H
authors.initials: H
authors.lastname: Höfler
mesh_terms: D000230:Adenocarcinoma / Q000188:drug therapy / Q000235:genetics / Q000473:pathology / Q000601:surgery; D000971:Antineoplastic Combined Chemotherapy Protocols / Q000627:therapeutic use; D001471:Barrett Esophagus / Q000188:drug therapy* / Q000235:genetics* / Q000473:pathology / Q000601:surgery; D002945:Cisplatin / Q000008:administration & dosage; D017931:DNA Primers; D004938:Esophageal Neoplasms / Q000188:drug therapy* / Q000235:genetics* / Q000473:pathology / Q000601:surgery; D005472:Fluorouracil / Q000008:administration & dosage; D015972:Gene Expression Regulation, Neoplastic; D006801:Humans; D042965:Methylenetetrahydrofolate Reductase (NADPH2) / Q000235:genetics; D020360:Neoadjuvant Therapy; D017239:Paclitaxel / Q000008:administration & dosage; D020133:Reverse Transcriptase Polymerase Chain Reaction
chemical_list: D017931:DNA Primers; D042965:Methylenetetrahydrofolate Reductase (NADPH2); D017239:Paclitaxel; D002945:Cisplatin; D005472:Fluorouracil