Queen Elizabeth Hospital, situated in the capital of Sabah, Kota Kinabalu, is the main public tertiary referral centre in the state. We conducted a prospective epidemiological study in our hospital on breast cancer to provide unreported data on breast cancer in Sabah and, with statistical analysis, to recognise which particular groups of patients who are more likely to present with advanced disease. We hope that a clearer epidemiological picture of breast cancer in Sabah will lead to appropriate measures to improve the outcome of management of the disease in Sabah and Malaysia as a whole.