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Experimental drug shows promise for treatment-resistant leukemias
Date:4/8/2014

n for the most potent inhibitor currently in clinical trials. TTT-3002 also inhibited proteins made by genes further down the FLT3 signaling pathway, including STAT5, AKT and MAPK, and showed activity against the most frequently occurring FLT3 mutations, FLT3/ITD and FLT3/D835Y. Many cancer drugs are currently ineffective against FLT3/D835Y mutations.

When the Johns Hopkins team tested the drug in a mouse model of leukemia, they found that it not only eliminated the presence of leukemic cells within 10 days of treatment but also that the mice lived an average of more than 100 days following treatment, to study completion, and resumed normal bone marrow activity. By contrast, mice treated with a placebo died an average of 18 days following treatment.

Additional studies found that TTT-3002 performed as well as sorafenib, another FLT3 inhibitor, in treating leukemic mice, and that the drug was toxic to leukemia cell samples taken from newly diagnosed and relapsed patients with AML but did not affect normal bone marrow cells taken from healthy donors.

A single dose of the medication caused more than 90 percent inhibition against FLT3 signaling that lasted for 12 hours, Small says.


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Contact: Vanessa Wasta
wasta@jhmi.edu
410-614-2916
Johns Hopkins Medicine
Source:Eurekalert

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