All-trans-retinoic acid and arsenic trioxide as initial therapy for acute promyelocytic leukemia.

Acute promyelocytic leukemia (APL) is a rare subtype of acute myeloid leukemia (AML). Treatment of pediatric APL is based on the combination of all-trans-retinoic acid (ATRA), an anthracycline and cytosine arabinoside. Arsenic trioxide (ATO) has been studied in adults with newly diagnosed or relapsed APL with excellent response rates both when used as a single agent or in combination with ATRA or ATRA plus chemotherapy. There is little data on combination therapy with ATRA and ATO in pediatric APL. We present a case of an adolescent male with APL who was treated using ATRA and ATO without conventional chemotherapy agents.