title: SLCO1B1 and SLC19A1 gene variants and irinotecan-induced rapid response and survival: a prospective multicenter pharmacogenetics study of metastatic colorectal cancer.
abstract: BACKGROUND
  Rapid response to chemotherapy in metastatic colorectal cancer (mCRC) patients (response within 12 weeks of chemotherapy) may increase the chance of complete resection and improved survival. Few molecular markers predict irinotecan-induced rapid response and survival. Single-nucleotide polymorphisms (SNPs) in solute carrier genes are reported to correlate with the variable pharmacokinetics of irinotecan and folate in cancer patients. This study aims to evaluate the predictive role of 3 SNPs in mCRC patients treated with irinotecan and fluoropyrimidine-containing regimens.
  
  
  METHODS
  Three SNPs were selected and genotyped in 137 mCRC patients from a Chinese prospective multicenter trial (NCT01282658). The chi-squared test, univariate and multivariable logistic regression model, and receiver operating characteristic analysis were used to evaluate correlations between the genotypes and rapid response. Kaplan-Meier survival analysis and Cox proportional hazard models were used to evaluate the associations between genotypes and survival outcomes. Benjamini and Hochberg False Discovery Rate correction was used in multiple testing.
  
  
  RESULTS
  Genotype GA/AA of SNP rs2306283 of the gene SLCO1B1 and genotype GG of SNP rs1051266 of the gene SLC19A1 were associated with a higher rapid response rate (odds ratio [OR] =3.583 and 3.521, 95%CI =1.301-9.871 and 1.271-9.804, p=0.011 and p=0.013, respectively). The response rate was 70% in patients with both genotypes, compared with only 19.7% in the remaining patients (OR = 9.489, 95%CI = 2.191-41.093, Fisher's exact test p=0.002). Their significances were all maintained even after multiple testing (all p c < 0.05). The rs2306283 GA/AA genotype was also an independent prognostic factor of longer progression-free survival (PFS) (hazard ratio = 0.402, 95%CI = 0.171-0.945, p=0.037). None of the SNPs predicted overall survival.
  
  
  CONCLUSIONS
  Polymorphisms of solute carriers' may be useful to predict rapid response to irinotecan plus fluoropyrimidine and PFS in mCRC patients.
authors.affiliation: Department of Oncology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, P. R. China.
authors.forename: Liu
authors.initials: L
authors.lastname: Huang
authors.forename: Tao
authors.initials: T
authors.lastname: Zhang
authors.forename: Conghua
authors.initials: C
authors.lastname: Xie
authors.forename: Xin
authors.initials: X
authors.lastname: Liao
authors.forename: Qianqian
authors.initials: Q
authors.lastname: Yu
authors.forename: Jueping
authors.initials: J
authors.lastname: Feng
authors.forename: Hong
authors.initials: H
authors.lastname: Ma
authors.forename: Jing
authors.initials: J
authors.lastname: Dai
authors.forename: Min
authors.initials: M
authors.lastname: Li
authors.forename: Jigui
authors.initials: J
authors.lastname: Chen
authors.forename: Aihua
authors.initials: A
authors.lastname: Zang
authors.forename: Qian
authors.initials: Q
authors.lastname: Wang
authors.forename: Shuwang
authors.initials: S
authors.lastname: Ge
authors.forename: Kai
authors.initials: K
authors.lastname: Qin
authors.forename: Juan
authors.initials: J
authors.lastname: Cai
authors.forename: Xianglin
authors.initials: X
authors.lastname: Yuan
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000970:Antineoplastic Agents / Q000494:pharmacology* / Q000627:therapeutic use; D000971:Antineoplastic Combined Chemotherapy Protocols; D002166:Camptothecin / Q000031:analogs & derivatives* / Q000494:pharmacology / Q000627:therapeutic use; D015179:Colorectal Neoplasms / Q000188:drug therapy* / Q000235:genetics / Q000473:pathology*; D005260:Female; D006239:Haplotypes; D006801:Humans; D000077146:Irinotecan; D015810:Linkage Disequilibrium; D027381:Liver-Specific Organic Anion Transporter 1; D008297:Male; D008875:Middle Aged; D009362:Neoplasm Metastasis; D027361:Organic Anion Transporters / Q000235:genetics*; D010597:Pharmacogenetics; D020641:Polymorphism, Single Nucleotide; D011446:Prospective Studies; D011743:Pyrimidines / Q000737:chemistry / Q000494:pharmacology / Q000627:therapeutic use; D058978:Reduced Folate Carrier Protein / Q000235:genetics*; D016019:Survival Analysis; D013997:Time Factors; D016896:Treatment Outcome; D055815:Young Adult
chemical_list: D000970:Antineoplastic Agents; D027381:Liver-Specific Organic Anion Transporter 1; D027361:Organic Anion Transporters; D011743:Pyrimidines; D058978:Reduced Folate Carrier Protein; C548699:SLC19A1 protein, human; C503999:SLCO1B1 protein, human; D000077146:Irinotecan; C030986:pyrimidine; D002166:Camptothecin