NSC781406 is a highly potent PI3K and mTOR inhibitor with an IC50 of 2 nM for PI3Kα.
NSC781406 demonstrates potent PI3K inhibition (PI3Kα IC50=2.0 nM) that translates into BEL-7404 cells proliferation inhibition (IC50=20 nM). NSC781406 displays reasonable liver microsome stability. NSC781406 demonstrates cytotoxic activities against leukemia, non-small cell, lung cancer, colon cancer, central nervous system cancer, melanoma, ovarian cancer, renal cancer, prostate cancer, and breast cancer. It is potent against 60 cancer cell lines with a mean GI50 value of 65 nM, and with a GI50 value less than 10 nM against four cancer cell lines[1].
In the xenograft models, treatment with 30 mg/kg of NSC781406 results in statistically significant antitumor activity, with a mean reduction in relative tumor volume ratio of 52%. Sorafenib displays an inhibition ratio of 44% at 50 mg/kg. NSC781406 is well tolerated at 30 mg/kg, with no observed mortality or significant reduction of body weight[1].
[1]. Chen Y, et al. Discovery of benzenesulfonamide derivatives as potent PI3K/mTOR dual inhibitors with in vivo efficacies against hepatocellular carcinoma. Bioorg Med Chem. 2016 Mar 1;24(5):957-66.