Transient IGF-1R inhibition combined with osimertinib eradicates AXL-low expressing EGFR mutated lung cancer
Rong Wang, Tadaaki Yamada, Kenji Kita, Hirokazu Taniguchi, Sachiko Arai, Koji Fukuda, Minoru Terashima, Akihiko Ishimura, Akihiro Nishiyama, Azusa Tanimoto, Shinji Takeuchi, Koshiro Ohtsubo, Kaname Yamashita, Tomoyoshi Yamano, Akihiro Yoshimura, Koichi Takayama, Kyoichi Kaira, Yoshihiko Taniguchi, Shinji Atagi, Hisanori Uehara, Rikinari Hanayama, Isao Matsumoto, Xujun Han, Kunio Matsumoto, Wei Wang, Takeshi Suzuki, Seiji Yano
Abstract
Drug tolerance is the basis for acquired resistance to epidermal growth factor receptor-tyrosine kinase inhibitors (EGFR-TKIs) including osimertinib, through mechanisms that still remain unclear. Here, we show that while AXL-low expressing EGFR mutated lung cancer (EGFRmut-LC) cells are more sensitive to osimertinib than AXL-high expressing EGFRmut-LC cells, a small population emerge osimertinib tolerance. The tolerance is mediated by the increased expression and phosphorylation of insulin-like growth factor-1 receptor (IGF-1R), caused by the induction of its transcription factor FOXA1. IGF-1R maintains association with EGFR and adaptor proteins, including Gab1 and IRS1, in the presence of osimertinib and restores the survival signal. In AXL-low-expressing EGFRmut-LC cell-derived xenograft and patient-derived xenograft models, transient IGF-1R inhibition combined with continuous osimertinib treatment could eradicate tumors and prevent regrowth even after the cessation of osimertinib. These results indicate that optimal inhibition of tolerant signals combined with osimertinib may dramatically improve the outcome of EGFRmut-LC.