Which marker is NOT part of the IHC panel for primary spindle cell sarcomas?

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Multiple Choice

Which marker is NOT part of the IHC panel for primary spindle cell sarcomas?

Explanation:
In immunohistochemistry for spindle cell sarcomas, you look for markers that reveal mesenchymal origin and specific differentiation pathways, helping to classify the tumor rather than rule it in as a glial or neural tumor. Desmin is a muscle marker; its positivity supports muscle-lineage tumors such as leiomyosarcoma or rhabdomyosarcoma. Glial Fibrillary Acidic Protein, on the other hand, marks glial cells in the central nervous system and is used to identify CNS tumors like astrocytomas, not spindle cell sarcomas. Therefore, GFAP would not be part of the typical IHC panel used to characterize primary spindle cell sarcomas.

In immunohistochemistry for spindle cell sarcomas, you look for markers that reveal mesenchymal origin and specific differentiation pathways, helping to classify the tumor rather than rule it in as a glial or neural tumor. Desmin is a muscle marker; its positivity supports muscle-lineage tumors such as leiomyosarcoma or rhabdomyosarcoma. Glial Fibrillary Acidic Protein, on the other hand, marks glial cells in the central nervous system and is used to identify CNS tumors like astrocytomas, not spindle cell sarcomas. Therefore, GFAP would not be part of the typical IHC panel used to characterize primary spindle cell sarcomas.

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