[Comment] First head-to-head trial of colonoscopy versus faecal testing for colorectal cancer screening

Cancer screening tests can be divided into early detection and preventive tests.1 Early-detection tests (eg, mammography for breast cancer and prostate-specific antigen testing for prostate cancer) detect cancer early with the aim of reducing cancer mortality. These tests cannot reduce the risk of individuals developing cancer. Preventive screening tests (eg, colonoscopy for colorectal cancer and Papanicolaou-smear cytology for cervical cancer) aim to prevent cancer through the identification of benign cancer precursors for removal.