Combinatorial therapy for cancer: A therapeutic mix encompassing Metformin and Navitoclax/ABT-263 (MAN) increases the expression of mitochondrial protein LACTB, decreases levels of mitochondrial phosphatidylserine decarboxylase, alters mitochondrial lipid metabolism, and promotes differentiation of breast cancer cells via up-regulation of its target gene, 12/February/2018, 10.31 pm