In IDC, cancer cells start in the milk duct then break through the duct wall into the surrounding breast tissue. From there, they can reach the lymph nodes and, over time, other organs.
About IDC
- Accounts for about 80% of invasive breast cancers
- Often feels like a hard, irregular lump
- Sometimes found only on imaging
- Treatment follows the tumour’s receptor profile
IDC is a well-understood cancer with many effective treatments. The specific plan — surgery, radiation, hormone therapy or targeted therapy — is built from the tumour’s biology and stage.