title: The value of XPD and XRCC1 genotype polymorphisms to predict clinical outcome in metastatic colorectal carcinoma patients with irinotecan-based regimens.
abstract: BACKGROUND
  Previous studies have suggested that DNA repair enzyme polymorphisms may bear prognostic value in metastatic colorectal carcinoma (MCRC).
  
  
  METHODS
  We prospectively treated 43 MCRC patients with irinotecan-based regimens (XELIRI or IFL). Allelic variants of the XRCC1 gene at codon 399 and XPD gene at codon 751 were analyzed in lymphocyte DNA by PCR-RFLP. Clinical outcome variables: overall survival (OAS), progression-free survival (PFS) and the occurrence of grade 3 or 4 hematological and gastrointestinal (GIS) toxicities were evaluated.
  
  
  RESULTS
  In the univariate analysis for OAS (n = 43) only XPD and XRCC1 polymorphisms were significant (P = 0.05 and P = 0.04, respectively). After adjustment for performance status (ECOG = 0, 1 vs. 2) and disease extent (single vs. multiple metastatic site), XRCC1 genotype and performance status retained significance (HR = 2.85, P = 0.04, and HR = 3.19, P = 0.02, respectively). Gln/Gln genotype was associated with the greatest risk of death. Type of presentation (metastatic vs. local disease at first presentation) was the only significant predictor of PFS in the univariate analysis (n = 40, P = 0.003). After adjustment for performance status and disease extent, type of presentation retained its significance (HR = 4.35, P = 0.003). None of the toxicities was associated with these genotypes.
  
  
  CONCLUSIONS
  XRCC1 genotype independently predicted overall survival in metastatic colorectal carcinoma patients treated with irinotecan-based chemotherapy.
authors.affiliation: Department of Medical Oncology, Meram Medical Faculty, Selcuk University, Meram, 42080 Konya, Turkey. martac@selcuk.edu.tr
authors.forename: Mehmet
authors.initials: M
authors.lastname: Artac
authors.forename: Hakan
authors.initials: H
authors.lastname: Bozcuk
authors.forename: Sacide
authors.initials: S
authors.lastname: Pehlivan
authors.forename: Songül
authors.initials: S
authors.lastname: Akcan
authors.forename: Mustafa
authors.initials: M
authors.lastname: Pehlivan
authors.forename: Tugce
authors.initials: T
authors.lastname: Sever
authors.forename: Mustafa
authors.initials: M
authors.lastname: Ozdogan
authors.forename: Burhan
authors.initials: B
authors.lastname: Savas
mesh_terms: D000230:Adenocarcinoma / Q000097:blood / Q000188:drug therapy / Q000235:genetics* / Q000473:pathology; D000328:Adult; D000368:Aged; D000704:Analysis of Variance; D000971:Antineoplastic Combined Chemotherapy Protocols / Q000627:therapeutic use*; D014408:Biomarkers, Tumor / Q000097:blood; D002166:Camptothecin / Q000008:administration & dosage / Q000031:analogs & derivatives*; D015179:Colorectal Neoplasms / Q000097:blood / Q000188:drug therapy / Q000235:genetics* / Q000473:pathology; D004260:DNA Repair / Q000187:drug effects / Q000235:genetics; D004268:DNA-Binding Proteins / Q000235:genetics*; D005260:Female; D005500:Follow-Up Studies; D020022:Genetic Predisposition to Disease; D005838:Genotype; D006801:Humans; D000077146:Irinotecan; D008297:Male; D008875:Middle Aged; D009367:Neoplasm Staging; D020641:Polymorphism, Single Nucleotide; D011237:Predictive Value of Tests; D011446:Prospective Studies; D016019:Survival Analysis; D016896:Treatment Outcome; D000076105:X-ray Repair Cross Complementing Protein 1; D051759:Xeroderma Pigmentosum Group D Protein / Q000235:genetics*
chemical_list: D014408:Biomarkers, Tumor; D004268:DNA-Binding Proteins; D000076105:X-ray Repair Cross Complementing Protein 1; C000619371:XRCC1 protein, human; D000077146:Irinotecan; D051759:Xeroderma Pigmentosum Group D Protein; C497292:ERCC2 protein, human; D002166:Camptothecin