A synergistically effective combination of an anti-cancer agent and athiosemicarbazone therapeutic compound offormula (I), which is an mTOR-Rictor inhibitor, a Serine 473 phosphorylationinhibitor, an AKT2 inhibitor, or a combinationthereof, for use in the treatment of cancer, and methods and uses thereof.Also included are methods and uses of a thiosemicarbazonefor treating a cancer in a mammal in need thereof, characterized by over-expression of RAS, by an EGFR mutation, and/orby over-expression of AKT2.