What are Common Histological Subtypes of Breast Cancer?

Breast cancer can be classified into various histological subtypes, each with distinct characteristics:

- Ductal Carcinoma In Situ (DCIS): A non-invasive cancer confined to the milk ducts.
- Invasive Ductal Carcinoma (IDC): The most common type, where cancer cells break through the duct walls into surrounding tissue.
- Invasive Lobular Carcinoma (ILC): Originates in the milk-producing lobules and invades nearby tissue.
- Triple-Negative Breast Cancer (TNBC): Lacks expression of estrogen receptor, progesterone receptor, and HER2; often more aggressive.
- HER2-Positive Breast Cancer: Overexpression of the HER2 protein, associated with more aggressive growth but responsive to targeted therapies.