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PRAME Expression and Melanoma In Situ Margin Assessment
Thomas N Helm1, Charlene Lam1, Bohdan Zoshchuk2
1Departments of Dermatology, and.
Abstract:
Melanoma in situ on chronically sun-damaged skin may extend significantly beyond clinically visible borders. Immunohistochemistry, particularly PRAME (PReferentially expressed Antigen in MElanoma), has emerged as a useful adjunct in delineating subclinical spread of lentigo maligna-type melanoma in situ. We report a case illustrating the diagnostic challenge of determining margins for melanoma in situ of lentigo maligna type even with the benefit of PRAME immunohistochemistry.
Insights
Determining melanoma in situ margins on sun-damaged skin is challenging. PRAME immunohistochemistry aids in identifying subclinical spread but doesn't fully resolve diagnostic difficulties for lentigo maligna melanoma in situ.
Area of Science:
- Dermatopathology
- Oncology
- Immunohistochemistry
Background:
- Melanoma in situ on chronically sun-damaged skin can have subclinical extensions.
- Accurate margin assessment is crucial for effective treatment of lentigo maligna.
- Clinical visualization often underestimates the true extent of melanoma in situ.
Purpose of the Study:
- To highlight the diagnostic challenges in determining margins for melanoma in situ.
- To evaluate the utility of PRAME immunohistochemistry in assessing subclinical spread.
- To present a case study of lentigo maligna-type melanoma in situ with margin difficulties.
Main Methods:
- Utilized immunohistochemistry, specifically PRAME staining.
- Analyzed a case of melanoma in situ of the lentigo maligna type.
- Correlated clinical findings with histopathological assessment.
Main Results:
- PRAME immunohistochemistry provided additional information regarding subclinical spread.
- Despite PRAME use, determining definitive margins remained a diagnostic challenge.
- The case illustrated limitations in current diagnostic tools for complex melanoma in situ cases.
Conclusions:
- Accurate margin delineation for lentigo maligna-type melanoma in situ remains difficult.
- PRAME immunohistochemistry is a valuable adjunct but not a definitive solution.
- Further advancements are needed for precise margin assessment in challenging melanoma in situ cases.
