Background: The incidence of breast cancer in younger women, that is, aged 50 years or younger, in Hong Kong is increasing. The Internet-based Younger Women's Wellness After Cancer Program (YWWACP) is a whole-lifestyle intervention that can help young women to manage their health and risks of chronic diseases.
Objectives: The study aimed to test the acceptability and feasibility of the culturally adapted YWWACP in Hong Kong (YWWACPHK) and to evaluate its preliminary effects in improving health-related quality of life, distress, sexual function, menopausal symptoms, dietary intake, physical activity, and sleep among younger Chinese women with breast cancer.