BCL2 and renal cell carcinoma: Although Bcl-2 expression has also been intensively investigated in other studies, its role in RCC progression and RCC patients prognosis remains controversial (Lipponen et al, 1995; Vasavada et al, 1998; Huang et al, 1999; Sejima and Miyagawa, 1999; Zhang and Takenaka, 2000; Uchida et al, 2002).