References: |
ARQ-531 (ARQ531) is a potent, reversible, orally available inhibitor of both wild type and C481S-mutant BTK kinase with IC50 of 0.85 and 0.39 nM, respectively; also ptently inhibits 45 kinases with >50% inhibition at 200 nM (TEC, BMX, LCK, TRK family kinases etc.); does not require the C481S residue to bind to BTK, inhibits CD69 expression on CD20+ B-cells with IC50 of 42 nM (Ibrutinib, IC50=3 nM); ARQ-531 inhibits proliferation of malignant cells both sensitive and resistant to ibrutinib (SUDHL6 Cell GI50=80 nM), ARQ 531 is superior to Ibrutinib in a TCL1 highly predictive adoptive transfer model of CLL. |