LS-106, a novel EGFR inhibitor targeting C797S, exhibits antitumor activities both in vitro and in vivo.

Abstract

With the wide clinical use of the third-generation epidermal growth factor receptor (EGFR) inhibitor osimertinib for the treatment of EGFR-mutated non-small cell lung cancer (NSCLC), acquired resistance caused by EGFR C797S tertiary mutation has become a concern. Therefore, fourth-generation EGFR inhibitors that could overcome this mutation have gained increasing attention in recent years. Here, we identified LS-106 as a novel EGFR inhibitor against C797S mutation and evaluated its antitumor activity both in vitro and in vivo. In cell-free assay, LS-106 potently inhibited the kinase activities of EGFR19del/T790M/C797S and EGFRL858R/T790M/C797S with IC50 values of 2.4 nmol/L and 3.1 nmol/L, respectively, which was more potent than osimertinib. Meanwhile, LS-106 exhibited comparable kinase inhibitory effect to osimertinib on EGFRL858R/T790M and wild-type EGFR. Results from cellular experiments demonstrated that LS-106 potently blocked the phosphorylation of EGFR C797S triple mutations in the constructed BaF3 cells that highly expressed EGFR19del/T790M/C797S or EGFRL858R/T790M/C797S , and thus inhibited the proliferation of these cells. We also constructed tumor cells harboring EGFR19del/T790M/C797S (named PC-9-OR cells) using the CRISPR/Cas9 system and found that LS-106 markedly suppressed the activation of EGFR19del/T790M/C797S and the proliferation of PC-9-OR cells. Moreover, cells harboring EGFR19del/T790M/C797S underwent remarkable apoptosis upon LS-106 treatment. In vivo experiments further demonstrated that oral administration of LS-106 caused significant tumor regression in a PC-9-OR xenograft model, with a tumor growth inhibition rate (TGI) of 83.5% and 136.6% at doses of 30 and 60 mg/kg, respectively. Taken together, we identified LS-106 as a novel fourth-generation EGFR inhibitor against C797S mutation and confirmed its preclinical antitumor effects in C797S-triple-mutant tumor models.

• Authors: Yingqiang Liu, Mengzhen Lai, Shan Li, Yanan Wang, Fang Feng, Tao Zhang, Linjiang Tong, Mengge Zhang, Hao Chen, Yi Chen, Peiran Song, Yan Li, Gang Bai, Yi Ning, Haotian Tang, Yan Fang, Yi Chen, Xiaoyun Lu, Meiyu Geng, Ke Ding, Ker Yu, Hua Xie, Jian Ding
• Journal: Cancer science (Cancer Sci) Vol. 113 Issue 2 Pg. 709-720 (Feb 2022) ISSN: 1349-7006 [Electronic] England
• PMID: 34855271 (Publication Type: Journal Article)
• Copyright: © 2021 The Authors. Cancer Science published by John Wiley & Sons Australia, Ltd on behalf of Japanese Cancer Association.

Chemical References

• Antineoplastic Agents
• EGFR protein, human
• ErbB Receptors
• Protein Kinase Inhibitors
• LS-106

Topics

• Animals
• Humans
• Mice
• Antineoplastic Agents (chemistry, pharmacology, therapeutic use)
• Apoptosis (drug effects)
• Carcinoma, Non-Small-Cell Lung (drug therapy, genetics, pathology)
• Cell Line, Tumor
• Cell Proliferation (drug effects)
• Drug Resistance, Neoplasm (drug effects, genetics)
• ErbB Receptors (antagonists & inhibitors, genetics)
• Lung Neoplasms (drug therapy, genetics, pathology)
• Molecular Structure
• Mutation (drug effects)
• Phosphorylation (drug effects)
• Protein Kinase Inhibitors (chemistry, pharmacology, therapeutic use)
• Xenograft Model Antitumor Assays