Summary
Epidermal growth factor receptor tyrosine kinase inhibitors (EGFR-TKIs) have led to great advances in the treatment of non-small cell lung cancer (NSCLC), but the emergence of drug resistance severely limits their clinical use. Thus, elucidation of the mechanism underlying resistance to EGFR-TKIs is of great importance. In our study, sustained activation of STAT3 was confirmed to be involved in resistance to EGFR-TKIs, and this resistance occurred regardless of exposure time, EGFR-TKIs type, and even cancer cell type. Mechanistically, the sustained activation of STAT3 was not related to gp130/JAK signalling pathway or HER2/EGFR heterodimer formation, while related to the expression and activation levels of STAT3. Furthermore, FGFR was shown to bind more strongly to STAT3 after gefitinib treatment, and the inhibition of FGFR reduced the phosphorylation of STAT3, thereby counteracting the effects of EGFR-TKIs and resulting in the synergistic inhibition of cancer cell proliferation. Taken together, the FGFR/STAT3 axis mediates the sustained activation of STAT3 upon EGFR-TKI treatment. This finding elucidates a new mechanism underlying drug resistance to EGFR-TKIs that the FGFR/STAT3 axis mediates the sustained activation of STAT3, providing theoretical support for considering the combination of TKIs and FGFR inhibitors in clinical cancer treatment.
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Acknowledgements
We appreciate Dr. Heidi Greulich’s generous help for providing the plasmids (EGFR D770-N771 insNPG, gag/pol and VSV-G).
Funding
This work was supported by the National Natural Science Foundation of China [No. 81673450] and the NSFC Shandong Joint Fund [U1606403, U1906212]; the Scientific and Technological Innovation Project was financially supported by Qingdao National Laboratory for Marine Science and Technology [No. 2015ASKJ02], the National Science and Technology Major Project for Significant New Drugs Development (2018ZX09735-004),Shandong Provincial Natural Science Foundation (major basic research projects, ZR2019ZD18) and Scientific Research Program Funded by Shaanxi Provincial Education Department (Program No. 19JK0850).
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All authors contributed to the study conception and design. Material preparation, data collection and analysis were performed by Xiaoping Song, Wei Tang, Hui Peng, Xin Qi. The first draft of the manuscript was written by Xiaoping Song and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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Song, X., Tang, W., Peng, H. et al. FGFR leads to sustained activation of STAT3 to mediate resistance to EGFR-TKIs treatment. Invest New Drugs 39, 1201–1212 (2021). https://doi.org/10.1007/s10637-021-01061-1
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DOI: https://doi.org/10.1007/s10637-021-01061-1