CDK4 and neoplasm: Immunohistochemistry showed positivity for S100, whereas the tumor was negative for cluster of differentiation 34 (CD34), pleomorphic adenoma gene 1 (PLAG1), B-cell lymphoma 2 (BCL-2), mouse double minute 2 homolog (MDM2), cyclin-dependent kinase 4 (CDK4), and DNA damage-inducible transcript 3 (DDIT3).