title: Role of primary miRNA polymorphic variants in metastatic colon cancer patients treated with 5-fluorouracil and irinotecan.
abstract: MicroRNAs are non-coding RNAs that can block mRNA translation and influence mRNA stability. Recent evidence indicates that miRNA variations can affect drug resistance, efficacy, and metabolism, opening new avenues of pharmacogenomics research. We investigated associations between polymorphisms in both miRNA-containing genomic regions (primary and precursor miRNA) and in genes related to miRNA biogenesis with clinical outcome in metastatic colorectal cancer (mCRC) patients treated with 5-fluorouracil and irinotecan (CPT-11). Eighteen single-nucleotide polymorphisms (SNPs) were analyzed in 61 patients. A significant association with tumor response and time to progression (TTP) was found for SNP rs7372209 in pri-miR26a-1 (P=0.041 and P=0.017, respectively). The genotypes CC and CT were favorable when compared with the TT variant genotype. In addition, SNP rs1834306, located in the pri-miR-100 gene, significantly correlated with a longer TTP (P=0.04). In the miRNA-biogenesis pathway, a trend was identified between SNP rs11077 in the exportin-5 gene and disease control rate (P=0.076). This study is the first to suggest a relationship between treatment outcome and SNPs in the miRNA-biogenesis machinery, in both primary and precursor miRNAs. Our results suggest that miRNA polymorphic variants might be useful predictors of clinical outcome in mCRC patients treated with 5-fluorouracil and CPT-11 combination.
authors.affiliation: Oncology Unit, Department of Oncology and Haematology, Casa Sollievo Sofferenza, S. Giovanni Rotondo, Italy.
authors.forename: V
authors.initials: V
authors.lastname: Boni
authors.forename: R
authors.initials: R
authors.lastname: Zarate
authors.forename: J C
authors.initials: JC
authors.lastname: Villa
authors.forename: E
authors.initials: E
authors.lastname: Bandrés
authors.forename: M A
authors.initials: MA
authors.lastname: Gomez
authors.forename: E
authors.initials: E
authors.lastname: Maiello
authors.forename: J
authors.initials: J
authors.lastname: Garcia-Foncillas
authors.forename: E
authors.initials: E
authors.lastname: Aranda
mesh_terms: D000368:Aged; D000971:Antineoplastic Combined Chemotherapy Protocols / Q000627:therapeutic use*; D002166:Camptothecin / Q000008:administration & dosage / Q000031:analogs & derivatives; D015179:Colorectal Neoplasms / Q000188:drug therapy / Q000235:genetics* / Q000473:pathology; D018450:Disease Progression; D005260:Female; D005472:Fluorouracil / Q000008:administration & dosage; D005838:Genotype; D006801:Humans; D000077146:Irinotecan; D008297:Male; D035683:MicroRNAs / Q000235:genetics*; D008875:Middle Aged; D009362:Neoplasm Metastasis; D020641:Polymorphism, Single Nucleotide; D012189:Retrospective Studies; D016896:Treatment Outcome
chemical_list: D035683:MicroRNAs; D000077146:Irinotecan; D005472:Fluorouracil; D002166:Camptothecin