differentiation
The degree to which cancer cells resemble normal cells in appearance and function, with well-differentiated tumors appearing more like normal tissue.
Full Definition
Cellular differentiation in cancer pathology describes how closely cancer cells resemble the normal cells from which they originated in terms of morphology, function, and organization. Well-differentiated tumors maintain many characteristics of normal tissue and typically grow more slowly, while poorly differentiated tumors show significant deviation from normal cellular architecture and tend to be more aggressive. Differentiation status is a key component of tumor grading systems and influences prognosis and treatment decisions. Undifferentiated tumors represent the most aggressive form, showing little resemblance to normal tissue.
Usage
Usage note: Use specific descriptors (well-differentiated, moderately differentiated, poorly differentiated, undifferentiated) when available.
In Context
- "The tumor showed poor differentiation with significant nuclear pleomorphism and high mitotic activity." — Pathology report
- "Well-differentiated adenocarcinoma typically has a more favorable prognosis than poorly differentiated tumors." — Medical literature