Hosted by China Anti-Cancer Association Breast Cancer Society, Fudan University Shanghai Cancer Center, and Shanghai Anticancer Association, the 12th Shanghai International Breast Cancer Symposium was successfully held in Shanghai during October 19 to October 21, 2017. As the most diversified annual event rich in content, this symposium almost covers all progresses in basic researches, clinical treatments, and preventions as well as reconstructions related to breast cancer. Altogether, more than 3,000 experts from home and abroad attended the grand meeting this year.