Osunprotafib (ABBV-CLS-484) hydrochloride is an orally active and selective active site PTPN1 ( IC 50 : 2.5 nM) and PTPN2 ( IC 50 : 1.8 nM) inhibitor. Osunprotafib hydrochloride has 6-8-fold weaker activity on PTPN9 and no detectable activity on SHP-1 or SHP-2. Osunprotafib hydrochloride increases the sensitivity of human cancer cell lines to IFNγ. Osunprotafib hydrochloride generates robust anti-tumor immunity by enhancing JAK-STAT signalling and reducing T cell dysfunction.
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