GALARUBICIN (DA-125) is an anthracycline derivative with anticancer activity, containing fluorine. The mechanism of action of this drug lies in inhibition of nucleic acid synthesis through intercalation with DNA. Because the structure and DNA-intercalating properties of DA-125 are similar to adriamycin, the cytotoxic effects of the two anthracyclines probably have similar biochemical mechanisms. Preclinical studies suggest that it may have greater activity and less cardiac toxicity than adriamycin. In a rodent study, administration of D-125 in higher dose levels (25 to 50 mg/kg) has been shown to result in testicular damage.