พยาธิสภาพ
1. non-invasive breast cancer: 
1.1 lobular carcinoma in situ (LCIS) is non-invasive lesion arising from the lobules and terminal duct s of breast
1.2 ductal carcinoma in situ (DCIS) is intraductal carcinoma
1.3 microinvasive carcinoma is a poorly defined pathologic entity, one of the most important goals in histological examination of DCIS lesions is identification of foci of stromal invasion
2. invasive breast cancer 
2.1 ductal carcinoma (70%) (infiltrating ductal carcinoma)
2.2  lobular carcinoma (10%) higher frequency of bilaterality and multicentricity
2.3 medullary carcinoma (9%)
2.4 mucinous carcinoma (2%) (colloid carcinoma)
2.5 other : phyllodes tumors (cystosarcoma phyllodes) etc.