Orelabrutinib (ICP-022) is a potent, orally active and irreversible inhibitor of Bruton's tyrosine kinase (BTK). Orelabrutinib has potential antineoplastic activity.
Orelabrutinib (ICP-022) is a potent, orally active and irreversible inhibitor of Bruton's tyrosine kinase (BTK). Orelabrutinib has potential antineoplastic activity.
Orelabrutinib potently inhibits BTK enzymatic activity with an IC50 value of 1.6 nM. In KINOMEscan assay conducted in parallel at 1 μM against a panel of 456 kinases, orelabrutinib only targets BTK with > 90% inhibition while ibrutinib inhibits additional many other kinases including EGFR, TEC and BMX, demonstrating orelabrutinib's superior kinase selectivity.[2]
Orelabrutinib has a favorable PK profile with an ideal T1/2 (~1.5-4 h) and good oral bioavailability (~20-80%) as well as prolonged BTK target occupancy in preclinical PK/PD studies. The superior selectivity translates into improved safety profile and large safety window in the GLP toxicology studies in rats and dogs.[2]
[1] Wei Xu, et al. Blood (2019) 134 (Supplement_1): 4319. [2] Bin Zhang, et al. Cancer Res 2020;80(16 Suppl):Abstract nr CT132.
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