A large proportion of adult patients with acute myeloid leukemia (AML) relapse after treatment, and some of them are resistant
to primary induction chemotherapy. Sixty-one patients from seven hematological centers with poor-risk AML, primary refractory
(
n = 16), or relapsed (
n = 45) were treated with a salvage regimen, including fludarabine (2 days) and cytarabine (3 days) in a sequential continuous
infusion, associated with liposomal daunorubicin (3 days) (FLAD). Complete response rate was 44% and 56% for refractory and
relapsed patients, respectively, with an overall response rate of 52% (32 of 61). Twenty-two patients (36%) were resistant
to the salvage therapy. Seven patients (12%) died early during chemotherapy, four of them because of sepsis. Nineteen patients
in complete remission (CR) underwent a stem-cell transplant (SCT) procedure: five autologous, nine from a HL-A identical sibling,
and five from HL-A matched unrelated donors. Post-treatment aplasia and mucositis were major toxicities. Twenty patients (62.5%)
relapsed after this treatment in a median of 7.3 months; ten patients relapsed after a SCT procedure. Nine patients are alive
and disease free; three of them were rescued after a further cytotoxic treatment. The FLAD regimen proved to be an effective
and well-tolerated treatment, with acceptable toxicity in this group of high-risk patients. A better response rate was obtained
in the subgroup of relapsed patients, compared to patients treated for refractory disease. More then half (five of nine) of
long-surviving patients are those who were submitted to a transplant procedure; thus, the main indication for FLAD seems to
be to try to induce a rapid CR with minimum toxicity in order to perform a transplant as soon as possible.
Keywords Refractory acute myeloid leukemia - Relapsed acute myeloid leukemia - Salvage treatment - DaunoXome - FLAD