A Pilot Study of Arsenic Trioxide-Based Consolidation Therapy for the Primary Treatment of Acute Promyelocytic Leukemia

OBJECTIVES:

• Determine, preliminarily, the safety of incorporating arsenic trioxide (ATO) into cytarabine and daunorubicin hydrochloride-based consolidation therapy followed by tretinoin maintenance therapy in patients receiving induction tretinoin and daunorubicin hydrochloride with acute promyelocytic leukemia (APL) induced into remission with tretinoin and daunorubicin hydrochloride.
• Determine, preliminarily, the efficacy of this strategy in inducing and maintaining molecular remissions in patients treated with this regimen.

OUTLINE: This is a pilot, multicenter study.

• Induction therapy: Patients receive oral tretinoin twice daily on days 1-60 and daunorubicin hydrochloride IV on days 4, 6, and 8. Patients are evaluated between days 60-67 and proceed to consolidation therapy.
• Consolidation therapy: Patients receive cytarabine IV continuously on days 1-3, daunorubicin hydrochloride IV on days 1-3, and arsenic trioxide IV over 1-2 hours once daily, 5 days a week, beginning on day 8 and continuing for 6 weeks. Patients with clinical and/or cytogenic, but not molecular, remission receive additional arsenic trioxide once daily, 5 days a week, for 30 doses (6 weeks). Patients achieving clinical and molecular remission after completion of 6 or 12 weeks of arsenic trioxide proceed to maintenance therapy.
• Maintenance therapy: Patients receive oral tretinoin once daily on days 1-15. Treatment repeats every 3 months for 8 courses (2 years).

After completion of study treatment, patients are followed periodically for up to 5 years.