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S-100 protein-positive cells in hidrocystomas
Journal of Cutaneous Pathology
|April 1, 1986
Summary
S-100 protein immunostaining helps classify hidrocystomas. Findings suggest solitary eccrine hidrocystomas originate from secretory cells, while multiple lesions arise from ducts, and some apocrine hidrocystomas may differentiate towards eccrine secretory cells.
Area of Science:
- Dermatopathology
- Histology
- Immunohistochemistry
Background:
- Hidrocystomas are benign cystic tumors of sweat glands.
- Understanding their histogenesis is crucial for accurate diagnosis and classification.
- S-100 protein is a marker found in various cell types, including some sweat gland components.
Observation:
- Immunostaining for S-100 protein was performed on normal sweat glands and eight hidrocystoma cases.
- In normal eccrine glands, S-100 protein was localized to secretory cells.
- Apocrine glands did not show S-100 protein expression.
Findings:
- One solitary eccrine hidrocystoma showed S-100 positivity, suggesting origin from secretory cells.
- Multiple eccrine hidrocystomas were S-100 negative, indicating origin from ductal cells.
- Some tumors diagnosed as apocrine hidrocystomas exhibited S-100 positivity, suggesting differentiation towards eccrine secretory cells.
- All hidrocystomas were positive for carcinoembryonic antigen (CEA), but S-100 protein was more informative for classification.
Implications:
- S-100 protein immunostaining is a valuable tool for differentiating the origins of hidrocystomas.
- This study refines the classification of eccrine and apocrine hidrocystomas based on cellular origin.
- Findings contribute to a better understanding of sweat gland tumor histogenesis and potential cellular differentiation pathways.