A series of 3, 5-disubstituted-1, 2, 4-oxadiazoles were synthesized and evaluated for their in vitro anti-proliferative activities against various cancer cell lines. Formation of 1, 2, 4- oxadiazole ring was accomplished by the reaction of amidoxime with carboxylic acids. The in vitro cytotoxic effects of 3, 5-disubstituted-1, 2, 4-oxadiazoles have been demonstrated across a wide array of tumor cell types and a few compounds exhibited specificity towards ...