"Methadone kills sensitive leukemia cells and also breaks treatment resistance, but without any toxic effects on non-leukemic blood cells," study senior author Claudia Friesen, of the Institute of Legal Medicine at the University Ulm in Germany, said in a news release issued by the American Association for Cancer Research. "We find this very exciting, because once conventional treatments have failed a patient, which occurs in old and also in young patients, they have no other options."

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