Breast cancer metastasis generally follows the following sites due to its anatomical structure and specific characteristics. The most common sites are the axilla, the contralateral breast, the contralateral axilla, and the areas above and below the clavicle, which is also known as the pipa bone, referring to the areas above and below the pipa bone. As for distant organs, based on the frequency or likelihood of occurrence, the most common are the lungs, bones, liver, and the brain, specifically within the head. These are referred to as the lungs, bones, liver, and head, which are the places most prone to distant organ metastasis.