If a stain is positive for CK7 and CDX2, which staining result is described?

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Multiple Choice

If a stain is positive for CK7 and CDX2, which staining result is described?

Explanation:
In immunohistochemistry, the result is described by listing the markers that show positivity. If a sample is positive for CK7 and CDX2, the description matches exactly the two markers involved: CK7, CDX2. CK7 is a cytokeratin commonly expressed in many epithelial tumors, while CDX2 is a marker of intestinal differentiation. The other options describe different marker profiles (for example, TTF-1 with PAX8 suggests a different lineage, Melan-A points to melanoma, and PAX8 alone indicates another lineage), none of which match both CK7 and CDX2 positivity.

In immunohistochemistry, the result is described by listing the markers that show positivity. If a sample is positive for CK7 and CDX2, the description matches exactly the two markers involved: CK7, CDX2. CK7 is a cytokeratin commonly expressed in many epithelial tumors, while CDX2 is a marker of intestinal differentiation. The other options describe different marker profiles (for example, TTF-1 with PAX8 suggests a different lineage, Melan-A points to melanoma, and PAX8 alone indicates another lineage), none of which match both CK7 and CDX2 positivity.

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