BCL2 and glioma: The growth inhibition of human grade IV glioma cells mediated by MtRV extract appears to be associated with apoptosis and G2/M phase cell cycle arrest, and altered expression of the pro- and anti-apoptotic genes (Bax, Bcl-2, Cas-3 and TP53) and proteins (Bax, Bcl-2, Cas-3 and p53), as well as decreased mitochondrial membrane potential.