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N-(1,1-Dimethylethyl)-3-[[5-methyl-2-[[4-[2-(1-pyrrolidinyl)ethoxy]phenyl]amino]-4-pyrimidinyl]amino]benzenesulfonamide TG 101348 SAR302503
TG101348 (SAR302503) is an orally available inhibitor of Janus kinase 2 (JAK-2) developed for the treatment of patients with myeloproliferative diseases including myelofibrosis. TG101348 acts as a competitive inhibitor of protein kinase JAK-2 with IC50=6 nM; related kinases FLT3 and RET are also sensitive, with IC50=25 nM and IC50=17 nM, respectively. Significantly less activity was observed against other tyrosine kinases including JAK3 (IC50=169 nM).[1] In treated cells the inhibitor blocks downstream cellular signalling (JAK-STAT) leading to suppression of proliferation and induction of apoptosis.
Myelofibrosis is a myeloid malignancy associated with anemia, splenomegaly, and constitutional symptoms. Patients with myelofibrosis frequently harbor JAK-STAT activating mutations that are sensitive to TG101348. Phase I trial results focused on safety and efficacy of TG101348 in patients with high- or intermediate-risk primary or post–polycythemia vera/essential thrombocythemia myelofibrosis have been published in 2011.
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