title: Genetic variants in DNA repair predicts the survival of patients with esophageal cancer.
abstract: OBJECTIVE
  To investigate the association of the genetic variants in excision repair cross-complementation group 2 (ERCC2) R156R and ERCC4 rs3136038 with survival duration for patients with esophageal cancer.
  
  
  BACKGROUND
  ERCC2 and ERCC4 are important molecules participating nucleotide excision repair system. The clinical relevance of the genetic variants of these genes is largely unknown currently.
  
  
  METHODS
  A total of 400 patients with a diagnosis of esophageal cancer were included. The genetic variants in the promoter regions of ERCC2 on R156R and ERCC4 on rs3136038 were analyzed with the TaqMan assay from leukocyte DNA collected before treatment and correlated to survival of the patients.
  
  
  RESULTS
  Presence with ERCC2 R156R C/C or ERCC4 rs3136038 C/T genotype of the patients could additively increase risk of death and disease progression. Under multivariate analysis, T, N staging and simultaneous presentation of these unfavorable genotypes were found significant for prognosis (P < 0.05). Accumulation of each unfavorable genotype would associate with adjusted HRs [95% CI] of 1.35 [1.10-1.65] and 1.37 [1.12-1.68] (P ≤ 0.05) for death and disease progression respectively. The prognostic impact of these genotypes were more evident in the subgroup of patients with early disease status including T staging (II or less), free from lymph node metastasis or being able to undergo surgical resection (P < 0.05 for both overall and disease progression-free survival duration, respectively).
  
  
  CONCLUSIONS
  Genetic variants in ERCC2 and ERCC4 may provide further survival prediction in addition to TNM staging system of esophageal cancer, which is more evident in the patients with early disease status.
authors.affiliation: Department of Surgery, National Taiwan University Hospital, Taipei, Taiwan, R.O.C. jmlee@ntu.edu.tw
authors.forename: Jang-Ming
authors.initials: JM
authors.lastname: Lee
authors.forename: Pei-Wen
authors.initials: PW
authors.lastname: Yang
authors.forename: Shi-Yi
authors.initials: SY
authors.lastname: Yang
authors.forename: Tzu-Hsuen
authors.initials: TH
authors.lastname: Chuang
authors.forename: En-Chi
authors.initials: EC
authors.lastname: Tung
authors.forename: Jin-Shing
authors.initials: JS
authors.lastname: Chen
authors.forename: Pei-Ming
authors.initials: PM
authors.lastname: Huang
authors.forename: Yung-Chie
authors.initials: YC
authors.lastname: Lee
mesh_terms: D000328:Adult; D000368:Aged; D002681:China; D015331:Cohort Studies; D016001:Confidence Intervals; D004260:DNA Repair / Q000235:genetics*; D004268:DNA-Binding Proteins / Q000235:genetics*; D018450:Disease Progression; D004938:Esophageal Neoplasms / Q000235:genetics* / Q000401:mortality* / Q000628:therapy; D005260:Female; D020022:Genetic Predisposition to Disease; D014644:Genetic Variation; D006801:Humans; D008297:Male; D008875:Middle Aged; D011110:Polymorphism, Genetic; D011237:Predictive Value of Tests; D011379:Prognosis; D012189:Retrospective Studies; D018570:Risk Assessment; D012680:Sensitivity and Specificity; D016019:Survival Analysis; D051759:Xeroderma Pigmentosum Group D Protein / Q000235:genetics*
chemical_list: D004268:DNA-Binding Proteins; C095888:xeroderma pigmentosum group F protein; D051759:Xeroderma Pigmentosum Group D Protein