1. Topoisomerase 1 Promoter Variants and Benefit from Irinotecan in Metastatic Colorectal Cancer Patients
- Author
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Elisa Paolicchi, Vincenzo Ricci, Fotios Loupakis, Caterina Vivaldi, Lorenzo Fornaro, Monica Ronzoni, Francesco Graziano, Romano Danesi, Gianluca Masi, Francesco Crea, Alfredo Falcone, and Veronica De Gregorio
- Subjects
Oncology ,Cancer Research ,medicine.medical_specialty ,biology ,Colorectal cancer ,business.industry ,Topoisomerase ,Single-nucleotide polymorphism ,General Medicine ,medicine.disease ,digestive system diseases ,Irinotecan ,03 medical and health sciences ,0302 clinical medicine ,030220 oncology & carcinogenesis ,Internal medicine ,medicine ,FOLFIRI ,Cancer research ,biology.protein ,030211 gastroenterology & hepatology ,business ,medicine.drug - Abstract
Objective:Topoisomerase 1 (topo-1) is an important target for the treatment of metastatic colorectal cancer (CRC). The aim of the present study was to evaluate the correlation between topo-1 single-nucleotide polymorphisms (SNPs) and clinical outcome in metastatic CRC (mCRC) patients. Methods: With the use of specific software (PROMO 3.0), we performed an in silico analysis of topo-1 promoter SNPs; the rs6072249 and rs34282819 SNPs were included in the study. DNA was extracted from 105 mCRC patients treated with FOLFIRI ± bevacizumab in the first line. SNP genotyping was performed by real-time PCR. Genotypes were correlated with clinical parameters (objective response rate, progression-free survival, and overall survival). Results: No single genotype was significantly associated with clinical variables. The G allelic variant of rs6072249 topo-1 SNP is responsible for GC factor and X-box-binding protein transcription factor binding. The same allelic variant showed a nonsignificant trend toward a shorter progression-free survival (GG, 7.5 months; other genotypes, 9.3 months; HR 1.823, 95% CI 0.8904-3.734; p = 0.1). Conclusion: Further analyses are needed to confirm that the topo-1 SNP rs6072249 and transcription factor interaction could be a part of tools to predict clinical outcome in mCRC patients treated with irinotecan-based regimens.
- Published
- 2016