Pathologic Classification of Breast Cancer
| Variable | Classification |
|---|---|
| Tumor invasion and appearance | Noninvasive |
| DCIS | |
| LCIS | |
| Invasive | |
| Invasive ductal carcinoma | |
| Invasive lobular carcinoma | |
| Other less common variants | |
| Other histologic assessments | Histologic grade |
| Presence of lymphovascular invasion | |
| Presence of microcalcifications | |
| Commonly measured phenotypic features | Hormone receptor expression |
| Estrogen receptor (ER) | |
| Progesterone receptor (PR) | |
| HER2/Neu expression (also known as cerbB2) | |
| Proliferation assay (e.g., Ki-67 index) |
DCIS = ductal carcinoma in situ; LCIS = lobular carcinoma in situ.