True or False: PAX-8 is a specific IHC marker that indicates RCC.

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Multiple Choice

True or False: PAX-8 is a specific IHC marker that indicates RCC.

Explanation:
PAX8 is a useful marker for tumors of renal origin in immunohistochemistry because it is commonly expressed in renal tubular epithelium and in many renal cell carcinomas. However, it is not specific to RCC; PAX8 is also expressed in a variety of non-renal tumors, such as thyroid carcinomas and Müllerian-derived tumors (like some ovarian and endometrial cancers). Because of this, a tumor being PAX8-positive supports a renal origin when interpreted with the histology and a broader panel of markers, but it cannot by itself confirm RCC. So the statement that PAX8 is a specific marker that indicates RCC is false.

PAX8 is a useful marker for tumors of renal origin in immunohistochemistry because it is commonly expressed in renal tubular epithelium and in many renal cell carcinomas. However, it is not specific to RCC; PAX8 is also expressed in a variety of non-renal tumors, such as thyroid carcinomas and Müllerian-derived tumors (like some ovarian and endometrial cancers). Because of this, a tumor being PAX8-positive supports a renal origin when interpreted with the histology and a broader panel of markers, but it cannot by itself confirm RCC. So the statement that PAX8 is a specific marker that indicates RCC is false.

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