ScreenIng of Genetic Susceptibility Genes for Breast Cancer Patients in CHinese communiTies

This large study is screening breast cancer patients in Chinese communities for genetic mutations (including BRCA1, BRCA2, and other hereditary cancer genes) to understand how common these mutations are and how they affect cancer risk and treatment outcomes. **You may be eligible if:** - You have been diagnosed with breast cancer (any stage, any age) - You are male or female - You are willing to sign consent and provide a blood or saliva sample **You may NOT be eligible if:** - You are a healthy person without breast cancer, or you have a different type of cancer but not breast cancer - You are unable to meet with investigators or sign informed consent for any reason - You cannot provide a blood or saliva sample Talk to your doctor to see if this trial is right for you.