Human T-cell lymphotropic virus type 1 associated adult T-cell leukemia/lymphoma carries a very poor prognosis due to its intrinsic resistance to chemotherapy. Although zidovudine (AZT) and alpha-interferon (IFN) yield some responses and improve ATL prognosis, alternative therapies are needed. Arsenic trioxide (As) dramatically synergizes with IFN to induce growth arrest and apoptosis of ATL leukemia cells in vitro. These results prompted us to initiate a phase II trial of As/IFN combination in seven patients with relapsed/refractory ATL (four acute and three lymphoma). Four patients exhibited a clear initial response (one complete remission and three partial remissions). Yet, the treatment was discontinued after a median of 22 days because of toxicity (three patients) or subsequent progression (four patients). Six patients eventually died from progressive disease (five patients) or infection (one patient), but the remaining patient is still alive and disease free at 32 months. Pharmacokinetic studies showed that maximum arsenic blood levels (median 0.46 microM) were slowly achieved (8-15 days). In conclusion, arsenic/IFN treatment is feasible and exhibits an anti-leukemia effect in very poor prognosis ATL patients despite a significant toxicity. Future studies should assess the best timing for arsenic therapy: frontline with IFN/AZT or as maintenance after induction.
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