Oral arsenic trioxide in the treatment of relapsed acute promyelocytic leukemia

Abstract
Treated with oral As2O3 were 12 consecutive unselected patients with relapsed APL (Table 1). The relapse was confirmed morphologically (> 30% blasts + abnormal promyelocytes in the marrow) and cytogenetically (presence of t(15;17), with none of the cases showing additional karyotyic aberrations) or molecularly (presence of PML/RARA). The treatment was given with informed consent, and the protocol was approved by the institutional review board of the University of Hong Kong. All patients had a pretreatment Karnofsky score higher than 80%. Routine monitoring included alternate daily blood counts and renal/liver function tests (LFTs), and electrocardiography (ECG) daily in the initial week, then weekly.

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