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Abstract
Colorectal cancer is one of the most common types of cancer in both men and women. Multiple chemotherapy combinations exist; however, there is currently no strategy for individualised therapy selection prior to treatment. Genetic polymorphisms in genes involved in the metabolism, transport or targets for the commonly used chemotherapy drugs (5-fluorouracil, irinotecan and oxaliplatin) have been described. Many require validation in large prospective trials before they can be used as markers for outcome and/or toxicity. This review describes the data available on polymorphisms in key genes that are associated with chemotherapy toxicity and response in colorectal cancer.