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IC50: A potent and selective pan-TRK inhibitor, suppressing the activity of TrkA and TrkB with IC50 of 8 and 12 nM, respectively.

GNF-5837 is reported to selectively suppress pan-TRK potently in an oral-bioavailable manner. Neurotrophins and their receptors (TRKs) are important in malignant transformations, chemotaxis, metastasis, and survival signaling and may contribute to the pathogenesis of a variety of tumors. The TRK-inhibiting properties of GNF-5837 therefore make it a useful tool to investigate TRK biology in cancer and other non-oncology indications. [1]

In vitro: The anti-TRKA activity of GNF-5837 was detected in Ba/F3 and RIE cells expressing both TRKA and NGF. In Ba/F3 cells, this compound exhibited intensively anti-proliferation activity with an IC50 of 0.042 μM. RIE cells expressing TRKA and NGF could only survive under low attachment condition and were resistant to detachment-induced apoptosis. GNF-5837 seemed to suppress cell growth and proliferation of RIE cells intensively with an IC50 of 0.017 μM. Moreover, GNF-5837 is reported to show inhibitory effects on c-Kit and PDGFR in Mo7e cells and Rat-A10 cells, respectively. [1]

In vivo: Mice models with tumor xenografts derived from RIE cells expressing both TRKA and NGF were established in one study. GNF-5837 was then administered at ascending doses once daily to these mice for 10 days, with the aim to investigate the in vivo efficacy of GNF-5837. 72 and 100% tumor inhibition was reported at the dose of 50 and 100 mg/kg, respectively. At 25 mg/kg, only partial tumor growth inhibition was observed. [1]

Clinical trial: So far, no clinical trial has been conducted.

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