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The results of a phase I dose-escalation study (NCT02096289) evaluating the safety and feasibility of oral thioridazine, a dopamine receptor D2 (DRD2) antagonist, in combination with cytarabine in patients 55 years and older with relapsed or refractory (R/R) acute myeloid leukemia (AML) were reported by a group of Canadian researchers in the August 2018 issue of Blood Advances.
In this phase I study, 13 patients aged 55 years or older with R/R AML (n = 9) or AML with myelodysplastic-related changes (AML-MRC; n = 4) were enrolled between July 2014 and September 2016. Patients received oral thioridazine at 25 mg (dose level I; n = 6), 50 mg (dose level II; n = 4), and 100 mg (dose level III; n = 3) every 6 hours alone for 21 consecutive days (days 1–22) and also in combination with intermediate-dose cytarabine (1 g/m2 for five consecutive days, days 6–10).
To evaluate the response to thioridazine in AML patients, a lead-in phase with thioridazine alone (days 1–5) and cytarabine (days 1–6) was performed. Bone marrow and peripheral blood samples were collected on day 5 to evaluate response to thioridazine alone, on day 22 after termination of thioridazine and on day 36 for the end of response assessment. DRD2 expression was measured at baseline using flow cytometry and correlated with response.
In summary, the findings of this study suggest that thioridazine at a dose of 50 mg every 6 hours can be safely combined with intermediate-dose cytarabine in older patients with R/R AML.
The researchers noted that the anti-leukemic effect of thioridazine was observed predominantly in the peripheral blood compared to the bone marrow and did not meet the “established clinical remission criteria in AML.” Additionally, these measurements were quite similar to those obtained in early generation FLT3 inhibitors. They further concluded by stating that the preliminary findings of this study suggest that “DRD2 represents a valid target in AML.”
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