Merkel cell carcinoma

Table 1 Immunohistochemical markers in the differential diagnosis of MCC.

	CK-20	TTF-1	NSE	S-100	GrA	SYP	NFP	CD56	MAP-2	LCA
MCC	+	-	+	-	+/-	+/-	+	+	+	-
SCLC	-	+	+/-	-	-/+	+	-/+	+	+	-
MM	-	-	-	+	-		-		+	-
LGNEC	+		+		+	+	-/+
Malignant lymphoma	-	-	-	-	-		-/+			+

+ positive, +/- mostly positive, -/+ mostly negative, - negative. CK-20 cytokeratin 20, TTF-1 thyroid transcription factor 1, NSE neuron-spesific enolase, GrA gromogranin A, NFP neurofilament proteins, CD56 neural adhesion molecule, MAP-2 microtubule associated protein 2, LCA leukocyte common antigen SCLC small cell lung carcinoma, MM malignant melanoma, LGNEC low grade neuroendocrine carcinomas

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