<qa>  What is the leading cancer among women in Saudi Arabia?Breast cancer is the leading cancer among women in Saudi Arabia representing almost the third of cancer diagnosed in Saudi women. Breast cancer in Saudi women is more frequently observed at young age. The data on this observation is either lacking or scares. Furthermore, the pathological and molecular features of breast cancer in young women are not clear. The study will provide important information to the national health care planner about this disease in young women including shedding light on possible genetic risk factors 