Interferon adjuvant to radical nephrectomy in Robson stages II and III renal cell carcinoma: a multicentric randomized study. - Pizzocaro,G.; Piva,L.; Colavita,M.; Ferri,S.; Artusi,R.; Boracchi,P.; Parmiani,G.; Marubini,E. (J Clin Oncol, 2001)