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LS‐106, a novel EGFR inhibitor targeting C797S, exhibits antitumor activities both in vitro and in vivo
Author(s) -
Liu Yingqiang,
Lai Mengzhen,
Li Shan,
Wang Yanan,
Feng Fang,
Zhang Tao,
Tong Linjiang,
Zhang Mengge,
Chen Hao,
Chen Yi,
Song Peiran,
Li Yan,
Bai Gang,
Ning Yi,
Tang Haotian,
Fang Yan,
Chen Yi,
Lu Xiaoyun,
Geng Meiyu,
Ding Ke,
Yu Ker,
Xie Hua,
Ding Jian
Publication year - 2022
Publication title -
cancer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.035
H-Index - 141
eISSN - 1349-7006
pISSN - 1347-9032
DOI - 10.1111/cas.15229
Subject(s) - t790m , osimertinib , in vivo , cancer research , chemistry , pharmacology , kinase , epidermal growth factor receptor , cancer , microbiology and biotechnology , medicine , biology , biochemistry , gefitinib , erlotinib
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 EGFR 19del/T790M/C797S and EGFR L858R/T790M/C797S with IC 50 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 EGFR L858R/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 EGFR 19del/T790M/C797S or EGFR L858R/T790M/C797S , and thus inhibited the proliferation of these cells. We also constructed tumor cells harboring EGFR 19del/T790M/C797S (named PC‐9‐OR cells) using the CRISPR/Cas9 system and found that LS‐106 markedly suppressed the activation of EGFR 19del/T790M/C797S and the proliferation of PC‐9‐OR cells. Moreover, cells harboring EGFR 19del/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.

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