Test Details: Immunohistochemical testing is carried out on biopsy/resected tissue specimen. This testing helps to identify specific antigens (proteins) within tissue sections utilizing an antigen-specific antibody .p63 (also called KET or p73L) is a member of the p53 gene family. p63 plays an important role in the differentiation of stratified epithelia and regulation of cell cycle progression. It is expressed in Squamous cell carcinoma, basal (myoepithelial) cell marker in prostatic and mammary glands.