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 .CD5 (lymphocyte antigen T1, Leu-1) is a glycoprotein receptor expressed in the majority of T-lymphocytes and subset of B-lymphocytes including mantle zone lymphocytes. CD5 labels different T-cell neoplasms such as T-ALL, adult and peripheral T-cell lymphoma, mycosis fungoides, and T-cell large granular lymphocytic leukaemia.