Invasive ductal carcinoma, also called infiltrating ductal carcinoma or ductal adenocarcinoma, is the most common type of invasive breast cancer. It accounts for up to 80% of all invasive breast cancers.
Invasive ductal carcinoma starts in the breast ducts but grows through the duct wall and spreads into nearby breast tissue. The cells can continue to grow and cause a lump or thickening in the breast. The breast cancer cells can also spread (metastasize) to the lymph nodes and other parts of the body.
Invasive ductal carcinomas frequently have some ductal carcinoma in situ (DCIS) cells in areas of the tumour. The presence of these DCIS cells suggests that DCIS may develop into an invasive tumour.
Invasive ductal carcinoma may be further classified as:
The treatment for all types of ductal carcinoma is the same. Surgery is the most common treatment.