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Immunohistochemistry staining results for CK20-positive MCC tumor microarray with CM2B4 or pan-HPyV
| Controls and cases | No. of cases | Positive cases |
|---|---|---|
| Neuroendocrine small cell carcinoma | 4 | 0 |
| MCC with no metastasis | 12 | 11 |
| MCC with metastatic disease | 13 | 9 |
CK20, cytokeratin 20; MCC, Merkel cell carcinoma; HPyV, human polyomavirus.
