Larotinib is a potent broad-spectrum and orally active tyrosine kinase inhibitor (TKI) with EGFR as the main target with an IC50 of 0.6 nM.
After daily administration of Larotinib mesylate, the no observed adverse effect level (NOAEL) is 10 mg/kg in Sprague-Dawley rats and the lowest observed adverse effect level (LOAEL) is 5 mg/kg in beagle dogs. The maximal tolerable doses (MTDs) are 20 and 25 mg/kg in Sprague-Dawley rats and beagle dogs, respectively[1].Larotinib mesylate shows dose-dependent antitumor results and a tumor-inhibiting rate exceeding 60% at 18 mg/kg in a tumor-bearing mice model (data not published)[1].
References:
[1]. Liu J, et al. Phase I Trial to Evaluate the Tolerance, Pharmacokinetics and Efficacy of the Broad-Spectrum ErbB Family Inhibitor Larotinib Mesylate in Patients With Advanced Solid Tumors. Front Pharmacol. 2021 Feb 18;12:636324.