Eccrine porocarcinoma: epidemiologic and histopathologic characteristics

Area of Science:

• Oncology
• Dermatology
• Pathology

Background:

• Eccrine porocarcinoma is an exceptionally rare malignant epithelial neoplasm, accounting for 0.005% of all such tumors.
• Existing literature predominantly consists of isolated case reports, highlighting a need for broader epidemiological and histopathological data.
• This study aimed to characterize patients diagnosed with eccrine porocarcinoma.

Purpose of the Study:

• To describe the epidemiological features of eccrine porocarcinoma.
• To detail the histopathological characteristics of eccrine porocarcinoma.
• To compare findings with existing literature on this rare tumor.

Main Methods:

• A retrospective analysis of cases diagnosed with eccrine porocarcinoma between January 1994 and December 2010.
• Inclusion criteria required histopathological confirmation of eccrine porocarcinoma.
• Data collected included frequency, demographics, tumor location, morphology, clinical diagnosis, and histopathology patterns, analyzed using descriptive statistics.

Main Results:

• Thirty-three cases of eccrine porocarcinoma were identified over the 17-year study period.
• The female gender predominated (64%), with an average age of 74 ± 12 years.
• The head was the most frequent location (37%), nodular morphology was common (46%), and squamous cell carcinoma was the frequent referral diagnosis (67%). Histopathological findings included necrosis (64%), comedonecrosis (45%), squamous differentiation (42%), and melanocyte colonization (21%).

Conclusions:

• This study identified distinct clinical and histopathological features compared to prior reports.
• The head emerged as the most common site for eccrine porocarcinoma in this cohort.
• The presence of melanocyte colonization was a notable histopathological finding in this series.