Single Nucleotide Polymorphisms: Impact on Susceptibility to Chemotherapy in Patients with Colorectal Cancer
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Background: Single-nucleotide polymorphisms (SNPs) in enzyme-coding genes play a role in susceptibility to anti-cancer therapy.
Materials & Methods: A prospective study was performed of the relationship between enzyme activity and treatment response, drug toxicity and hypersensitivity reactions in 51 patients with colorectal cancer treated with fluoropyrimidine-based chemotherapy. SNP analysis was performed in 22 enzyme-coding genes with a previously described role in treatment efficacy.
Results: SLC6 and MTHR enzyme activity was related with rates of progressive disease, GSTP1 activity with anti-EGFR antibodies-related skin toxicity, CYP3A5 and MTHR with chemotherapy dose reduction, CYP2B6, IL10, MTHR and TYMS activity with the risk of drug hypersensitivity reactions.
Conclusion: Pharmacogenetics is a valuable predictive marker in oncology, related to chemotherapy treatment response, toxicity and hypersensitivity.