What is the key histologic difference between invasive ductal carcinoma and DCIS?

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Study for the Histopathology and MTLE Test. Prepare with flashcards and multiple choice questions. Gain insights into the exam format, essential topics, and tips to excel your preparation!

Multiple Choice

What is the key histologic difference between invasive ductal carcinoma and DCIS?

Explanation:
The essential difference is whether tumor cells cross the basement membrane and invade the surrounding stroma. In DCIS, malignant cells are confined within the ducts or lobular units with an intact basement membrane and typically an intact myoepithelial layer. In invasive ductal carcinoma, those malignant cells breach the basement membrane and infiltrate the surrounding breast tissue, often triggering a desmoplastic stromal response. This breach of the basement membrane into stroma is what defines invasive disease and distinguishes it from DCIS.

The essential difference is whether tumor cells cross the basement membrane and invade the surrounding stroma. In DCIS, malignant cells are confined within the ducts or lobular units with an intact basement membrane and typically an intact myoepithelial layer. In invasive ductal carcinoma, those malignant cells breach the basement membrane and infiltrate the surrounding breast tissue, often triggering a desmoplastic stromal response. This breach of the basement membrane into stroma is what defines invasive disease and distinguishes it from DCIS.

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