title: Excision Repair Cross-complementation Group 1 is a Prognostic Biomarker in Patients with Colorectal Cancer Receiving Chemotherapy.
abstract: BACKGROUND
  Conflicting results about the association between expression level of excision repair cross-complementation group 1 (ERCC1) and clinical outcome in patients with colorectal cancer (CRC) receiving chemotherapy have been reported. Thus, we searched the available articles and performed the meta-analysis to elucidate the prognostic role of ERCC1 expression in patients with CRC.
  
  
  METHODS
  A thorough literature search using PubMed (Medline), Embase, Cochrane Library, Web of Science databases, and Chinese Science Citation Database was conducted to obtain the relevant studies. Pooled hazard ratios (HR s) or odds ratios (OR s) with 95% confidence intervals (CI s) were calculated to estimate the results.
  
  
  RESULTS
  A total of 11 studies were finally enrolled in this meta-analysis. Compared with patients with lower ERCC1 expression, patients with higher ERCC1 expression tended to have unfavorable overall survival (OS) (HR = 2.325, 95% CI: 1.720-3.143, P < 0.001), progression-free survival (PFS) (HR = 1.917, 95% CI: 1.366-2.691, P < 0.001) and poor response to chemotherapy (OR = 0.491, 95% CI: 0.243-0.990, P = 0.047). Subgroup analyses by treatment setting, ethnicity, HR extraction, detection methods, survival analysis, and study design demonstrated that our results were robust.
  
  
  CONCLUSIONS
  ERCC1 expression may be taken as an effective prognostic factor predicting the response to chemotherapy, OS, and PFS. Further studies with better study design and longer follow-up are warranted in order to gain a deeper understanding of ERCC1's prognostic value.
authors.forename: Mu-Xing
authors.initials: MX
authors.lastname: Li
authors.forename: Xin-Yu
authors.initials: XY
authors.lastname: Bi
authors.forename: Hong
authors.initials: H
authors.lastname: Zhao
authors.forename: Zhen
authors.initials: Z
authors.lastname: Huang
authors.forename: Yue
authors.initials: Y
authors.lastname: Han
authors.forename: Dong-Bin
authors.initials: DB
authors.lastname: Zhao
authors.forename: Jian-Jun
authors.initials: JJ
authors.lastname: Zhao
authors.affiliation: Department of Abdominal Surgical Oncology, Cancer Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100021, China.
authors.forename: Jian-Qiang
authors.initials: JQ
authors.lastname: Cai
mesh_terms: D015179:Colorectal Neoplasms / Q000188:drug therapy* / Q000401:mortality; D004268:DNA-Binding Proteins / Q000032:analysis*; D004720:Endonucleases / Q000032:analysis*; D006801:Humans; D007150:Immunohistochemistry; D011379:Prognosis
chemical_list: D004268:DNA-Binding Proteins; C071447:ERCC1 protein, human; D004720:Endonucleases