Stilbene analogs and pharmaceutical compositions that are useful for the treatment of various cancers, including without limitation, colorectal cancer (CRC) and breast cancer are disclosed. Such stilbene analogs include, for example, compounds of the following formula: wherein Ra, Rb, R4, R6, R7, R9 and R10 are all H; R2 and R3 are independently H, halo, amino, alkylamino, dialkylamino, N-oxides of dialkylamino, arylalkylamino, trialkylammonium, mercapto, alkylthio, alkanoyl, nitro, nitrosyl, cyano, alkoxy, alkenyloxy, aryl, heteroaryl, sulfonyl, sulfonamide, CONR11R12, NR11CO(R13), NR11COO(R13) or NR11CONR12R13; R11, R12 and R13, are independently, H, alkyl, aryl, heteroaryl or a fluorine; R8 is NRCRdZ wherein Rc is H, alkyl, alkoxy, aryl or heteroaryl, Rd is an alkyl group, Z is a an unshared pair of electrons, H, alkyl or oxygen; and R1 and R5 are halogen.