BCL2 and cancer: So as to improve the stability, the addition of PEG on the outer of nanocarriers became fashionable for system construction, such as mPEG45-b-PCL80-b-PPEEA10 for paclitaxel and siPlk1 71, PEG-PLL-PLLeu co-delivering docetaxel and Bcl-2 siRNA 72 or cSLN for co-delivering of paclitaxel and siMCL1 73 for better anti-cancer treatment.