Effect of MRBE on cell growth (A) and apoptosis (B) in SW480 cells. SW480 cells were treated with MRBE at the indicated concentration for 24 h. Cell growth was measured sung MTT solution and expressed as absorbance (A570). *P < 0.05 compared to cell without MRBE treatment. Apoptosis by MRBE was evaluated with Western blot against cleaved PARP. Actin was used as an internal control. DMSO was used as a vehicle.