Immunohistochemistry in ocular carcinomas.

Area of Science:

• Ophthalmology
• Dermatopathology
• Oncology

Background:

• Distinguishing between ocular sebaceous carcinoma, poorly differentiated ocular squamous cell carcinoma, and ocular basal cell carcinoma presents diagnostic challenges.
• Immunohistochemistry offers a potential solution for differentiating these complex ocular lesions.

Purpose of the Study:

• To evaluate the utility of an immunohistochemical panel in differentiating ocular sebaceous carcinoma, squamous cell carcinoma, and basal cell carcinoma.
• To determine the expression patterns of specific immunostains in these distinct tumor types.

Main Methods:

• Formalin-fixed, paraffin-embedded tissue samples of each tumor type were analyzed.
• Immunohistochemical techniques were employed to assess the distribution of various immunostains.

Main Results:

• Cytokeratin (CK)7 positivity was observed in 100% of sebaceous carcinomas.
• Epithelial membrane antigen (EMA) was positive in 100% of squamous cell carcinomas and 80% of sebaceous carcinomas, but negative in basal cell carcinomas.
• Ber-EP4 was positive in 100% of basal cell carcinomas and 80% of sebaceous carcinomas, while negative in all squamous cell carcinomas.

Conclusions:

• An EMA positive, Ber-EP4 positive immunophenotype supports sebaceous carcinoma.
• An EMA positive, Ber-EP4 negative result indicates squamous cell carcinoma.
• An EMA negative, Ber-EP4 positive result suggests basal cell carcinoma.