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Merkel cell carcinoma: evaluation of KIT (CD117) expression and failure to demonstrate activating mutations in the C‐KIT proto‐oncogene – implications for treatment with imatinib mesylate

Background:  Merkel cell carcinomas (MCCs) express the tyrosine kinase receptor KIT. However, it is not known if MCCs have activating mutations in KIT that would make them responsive to treatment with imatinib mesylate. The purpose of this article is to describe the KIT immunohistological staining pattern (CD117) of MCCs and analyze those MCCs for mutations in areas of KIT where mutations are found in gastrointestinal stromal cell tumors.