This study was aimed to investigate the immunoexpression of mdm2 oncoprotein, p27Kip1 tumor suppressor protein as well as bcl-2 anti-apoptotic protein in Warthin's tumor as a trial to clarify the possible role of these families in the pathogenesis of this unique tumor of salivary glands. The gene discussed is TCHP; the disease is tumor of salivary gland.