A method of treating BCR-ABL positive leukemia in a warm-blooded animal comprising administering the combination of N-{5-[4-(4-methyl-piperazino-methyl)-benzoylamido]-2-methylphenyl}-4-(3-pyridyl)-2-pyrimidine-amine, or a pharmaceutically acceptable salt thereof, and telomestatin is disclosed. The combination may optionally have a pharmaceutically acceptable carrier, and the compounds may be administered for simultaneous, separate or sequential use.