Test Details: Immunohistochemical testing helps to identify specific antigens (proteins) within tissue sections utilizing an antigen-specific antibody. PAX-8 is a transcriptional factor and a member of the paired box (PAX) family listed in detail with the markers of renal cell tumours. PAX-8 strongly labels all uterine, endocervical and ovarian tumours of Mullerian origin including serous, clear cell and endometrioid carcinomas.