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Histologic Features Associated with Deep Invasion in Dermatofibrosarcoma Protuberans
C Serra-Guillén1, B Llombart1, E Nagore1
1Servicio de Dermatología, Instituto Valenciano de Oncología, Valencia, España.
Background:
Dermatofibrosarcoma protuberans (DFSP) is a rare, slow-growing cutaneous tumor that can invade the subcutaneous tissue, muscle tissue, and even bone.
Objective:
To identify histologic features associated with greater depth of invasion, i.e., local aggressiveness, in DFSP.
Material And Methods:
We analyzed associations between histologic features of DFSP (e.g., type of subcutaneous invasion, histologic pattern, cell type, areas of fibrosarcoma) and the presence and absence of muscle fascia involvement.
Results:
We studied 155 cases of DFSP. The following histologic characteristics were significantly associated with involvement of the muscle fascia: the presence of a sheetlike pattern, a high degree of cellular pleomorphism, and more than 1 mitotic figure. The tumor did not extend beyond the subcutaneous tissue in the majority of cases (62.6%), but there was involvement of the fascia or galea aponeurotica in 17 cases (11%) and of the muscle tissue in 36 cases (23.2%).
Conclusions:
Histologic patterns, degree of pleomorphism, and number of mitotic figures are important predictors of deep invasion (fascia or muscle) in DFSP; these layers can be involved in up to 30% of cases.
Insights
Histologic features like sheetlike patterns, cellular pleomorphism, and mitotic figures predict deep invasion in dermatofibrosarcoma protuberans (DFSP). Understanding these can help assess local aggressiveness in DFSP.
Area of Science:
- Dermatopathology
- Surgical Oncology
- Oncologic Histology
Background:
- Dermatofibrosarcoma protuberans (DFSP) is a rare, slow-growing skin tumor.
- DFSP can exhibit aggressive local invasion into deeper tissues.
Purpose of the Study:
- To identify specific histologic features of DFSP associated with increased invasion depth.
- To correlate histological findings with local aggressiveness in DFSP.
Main Methods:
- Analysis of 155 DFSP cases.
- Evaluation of histologic features including pattern, cellularity, and mitotic activity.
- Assessment of association between histology and muscle fascia involvement.
Main Results:
- Sheetlike pattern, high cellular pleomorphism, and increased mitotic figures (>1) were linked to muscle fascia involvement.
- 62.6% of DFSP remained superficial; 11% involved fascia, and 23.2% invaded muscle.
- Histologic features significantly predicted deep tissue invasion.
Conclusions:
- Histologic patterns, pleomorphism, and mitotic rate are key predictors of deep DFSP invasion.
- Fascia or muscle involvement occurs in up to 30% of DFSP cases.
- These histological markers aid in assessing DFSP local aggressiveness.
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