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Background Epidermal growth factor receptor H773_V774 insH (EGFR-insH) is an EGFR exon 20 insertion mutation in non-small cell lung cancer (NSCLC), which is naturally resistant to available EGFR tyrosine kinase inhibitors (TKIs) and lacks a patient-derived cell line. Methods A Ba/F3 cell line expressing EGFR-insH mutation (Ba/F3-insH cell line) was generated using an IL3-deprivation method. A cell proliferation assay was performed to screen natural compounds that exhibit a synergistic effect with erlotinib. Trypan blue staining was used