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Frequent TLE1 Expression in Cutaneous Neoplasms.

Yiqin Xiong1, Karen Dresser2, Kristine M Cornejo3,4

  • 1Pathology Resident, Department of Pathology, University of Massachusetts Medical School, UMass Memorial Medical Center, Worcester, MA.

The American Journal of Dermatopathology
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TLE1 immunohistochemistry is frequently detected in sebaceous neoplasms, basal cell carcinoma, and squamous cell carcinoma. This suggests TLE1 is not a specific biomarker for synovial sarcoma and has limited diagnostic utility in cutaneous tumors.

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Area of Science:

  • Dermatopathology
  • Oncology
  • Immunohistochemistry

Background:

  • TLE1 immunohistochemistry is a recognized biomarker for synovial sarcoma.
  • Recent findings indicate TLE1 expression in melanomas, sebaceous glands, and follicular epithelium.
  • Limited research exists on TLE1 expression in various cutaneous tumors.

Purpose of the Study:

  • To investigate TLE1 expression in sebaceous neoplasms, basal cell carcinoma (BCC), and squamous cell carcinoma (SCC).
  • To determine if TLE1 staining patterns can aid in the diagnosis or classification of these cutaneous neoplasms.

Main Methods:

  • TLE1 immunohistochemistry was performed on tissue samples of sebaceous adenoma (n=26), sebaceoma (n=10), sebaceous carcinoma (n=19), BCC (n=20), and SCC (n=19).
  • Nuclear staining was graded (0-3+), with 2-3+ considered positive.
  • Sensitivity was calculated based on the percentage of positive cases for each tumor type.

Main Results:

  • High TLE1 positivity was observed in sebaceous adenomas (96%), sebaceomas (80%), and sebaceous carcinomas (90%).
  • TLE1 also showed frequent expression in BCC (95%) and SCC (63%).
  • Overall sensitivity ranged from 63% to 96% across the evaluated cutaneous tumors.

Conclusions:

  • TLE1 immunohistochemistry frequently stains sebaceous neoplasms, BCC, and SCC, indicating it is not a specific marker for synovial sarcoma.
  • Caution is advised when interpreting TLE1 staining in cutaneous tumors, especially when considering differential diagnoses.
  • TLE1 expression does not appear to be useful for the diagnosis or classification of these specific cutaneous neoplasms.