Treatment of leukemia.

A preferred embodiment of the invention encompasses a compounds having the property of anti-carcinogenic activity against human leukemia comprising the use of 4-(4-Ethoxy-phenyl)-2-(N′-fluoren-9-ylidene-hydrazino)-2-hydroxy-4-oxo-butyric acid methyl ester (OF-13), and/or 4-Chloro-4-(4-ethoxy-phenyl)-2-(fluoren-9-ylidene-hydrazono)-but-3-enoic acid methyl ester (3F-19) in humans as therapeutic means for the eradication of leukemia from the human's body.