Hereditary Non-Polyposis Colorectal Cancer (HNPCC) confers a high lifetime risk of developing cancer, especially colorectal and endometrial cancer. By characterising disease presentation in the patient cohort, HNPCC in an Australian context will be better defined. The aim of this proposal is to undertake a genetic investigation such that a more comprehensive personalised patient risk-assessment can be completed by identifying genes related to disease development.