Tilfrinib (compound 4f) is a potent and selective inhibitor of breast tumor kinase (Brk) with an IC50 of 3.15 nM, which displays anti-proliferative activity and acts as a promising antitumor agent[1].

BRK inhibitor P21d hydrochloride is a potent breast tumor kinase (BRK/PTK6) inhibitor with an IC50 of 30 nM. BRK inhibitor P21d hydrochloride inhibits p-SAM68 with an IC50 of 52 nM. BRK inhibitor P21d hydrochloride can be used to evaluate the in vivo activity of BRK inhibitors in xenograft breast tumor models[1].