TP53 and basal cell carcinoma: Immunohistochemistry studies have concluded that trichoblastoma and basal cell carcinoma express similar cytokeratins, and both strongly express B-cell lymphoma 2 (Bcl-2), tumor protein p53, and the follicular differentiation markers follistatin and B-lymphoma Mo-MLV insertion region 1 (Bmi-1) [9,36,41].