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The list of IHC for which" Dr Torres asks why" includes the following choices that I think are reasonable
- CD56 - generally considered the most sensitive neuroendocrine marker (and least specific), routinely we use CD56, synaptophysin, CrgA, and...
- Ki67 - useful for assessing mitotic activity in typical vs atypical carcinoids
- PanCK or AE1/AE3: Given the differential includes an adeno I think a cytokeratin would be reasonable