The European Code Against Cancer contains 12 recommendations to reduce the risk of cancer. It is estimated that about half of all cancers could be prevented if all recommendations are followed. The aim of this study was to evaluate the effectiveness of the Program of Health Behaviour Against Cancer (PHeBAC) applied to mothers of children with intellectual disabilities in increasing the participation of mothers and their children with intellectual disabilities in cancer screenings and their health behaviors against cancer. The goal is to improve the preventive health behaviors of children with intellectual disabilities and their mothers against cancer and to increase the rate of participation in cancer screenings. Specific targets are; not smoking and not being exposed to smoking, increasing physical activity, healthy nutrition, limiting alcohol consumption, protection from sunlight, HPV vaccination and increasing participation in breast, cervical and colorectal cancer screenings.