Oncogene and suppressor gene expression (cyclin D, p21WAF1, nm23-H1, Rb1, p16INK4A, and p53) was evaluated in 23 follicular thyroid carcinomas diagnosed in 20 women and 3 men operated or reoperated in Institute of Oncology in Gliwice in years 1992-1999. Positive reaction with p16INK4A, Rb1 and cyclin D1 antibodies was observed in all tumors, with nm23-H1 in 22 cases. The presence of p21WAF1 was stated in 8 cases (34.8%) and p53 in 7 cases (30.4%). A simultaneous presence of expression of p53 and lack of expression of p21WAF1 was stated three times and in two cases were accompanied by distant metastases. This pattern of expression was only rarely observed in minimally invasive follicular cancer. The prognostic significance of simultaneous immunohistochemical analysis of p53 and p21WAF1 in follicular thyroid carcinoma is suggested and has to be proved in further studies.