Expert: Lack of exercise is the leading cause of breast cancer in Chinese women. October is Breast Cancer Prevention Month, also known as "Pink Ribbon Month" Professor Liao Ning believes that women should exercise at least 30 to 50 minutes a day from a young age. She wants women to have their first child and breastfeed before the age of 35. She believes that when women receive assisted reproduction, they should first check the breast glands to confirm their health. The most effective way to reduce tumor mortality is early detection and early diagnosis.