[Correlation of MDR1 and ABCG2 genetic polymorphisms with the efficacy and adverse events of irinotecan chemotherapy in patients with colorectal cancer]
التفاصيل البيبلوغرافية
العنوان:
[Correlation of MDR1 and ABCG2 genetic polymorphisms with the efficacy and adverse events of irinotecan chemotherapy in patients with colorectal cancer]
To investigate the correlation of MDR1 and ABCG2 genetic polymorphisms with the efficacy and adverse events of irinotecan chemotherapy in patients with colorectal cancer (CRC).Clinical data of CRC patients treated with irinotecan-based chemotherapy in the Peking University Cancer Hospital between January 1996 and December 2011 were collected, and their blood samples were collected accordingly. Genomic DNA was extracted from blood samples. The following SNP detection of MDR1 and ABCG2 genes was conducted by direct sequencing method. The correlation of genetic SNPs with efficacy and toxicity of irinotecan treatment was further analyzed.Allele frequencies of MDR1 2677 GT/A, ABCG2 421 CA, 34 GA, 376 CT were comparable with previous studies. Genetic SNPs results from peripheral blood samples and tumor tissues were highly consistent. Patients carrying MDR1 2677 wild type had higher clinical benefit than those carrying mutant genotype, while the differences were not significant. The progression-free survival (PFS) was longer in wild-type patients as compared to mutant-type patients in second-line chemotherapy (P=0.012). There were no significant correlations between ABCG2 421 CA, 34 GA, 376 CT and chemotherapy efficacy. No significant correlations were observed between MDR1 2677 GT/A, ABCG2 421 CA, ABCG2 34 GA, ABCG2 376 CT and irinotecan-related grade 3 and 4 neutropenia or diarrhea.MDR1 2677 GT/A may be served as a biomarker in predicting the efficacy of irinotecan chemotherapy in patients with colorectal cancer.
