Alpha interferon, a natural disease fighter already used to treat leukemia, can now be used to battle Kaposi's sarcoma, a cancer that primarily attacks AIDS patients.

The Food and Drug Administration announced Monday that alpha interferon was shown in tests to be effective against Kaposi's and now is approved for treatment of the cancer that has become common among AIDS victims.Alpha interferon is a disease-fighter that is present in the body naturally in small amounts but has been artificially produced in large quantities in recent years.