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Immunohistochemistry of Merkel cell carcinoma (according to Schrama et al. 2011, Becker et al. 2008; [17, 18]). CK20: cytokeratin 20; CK7: cytokeratin 7; NSE: neuron-specific enolase; TTF1: thyorid transcriptor factor 1; LCA: leucocyte common antigen.
| CK20 | CK7 | NSE | TTF1 | S100 | LCA | |
|---|---|---|---|---|---|---|
| Merkel cell carcinoma (MCC) | + | − | + | − | − | − |
| Small cell carcinoma of the lung (SCLC) | − | + | + | + | − | − |
| Melanoma | − | − | − | − | + | − |
| Lymphoma | − | − | − | − | − | + |
