Patients were classified into the EGFR-TKI group and combination therapy group. The patients in EGFR-TKI group received first-, second-, or third- generation EGFR-TKI drugs only. The EGFR-TKI drugs include gefitinib, icotinib, erlotinib, afatinib, dacomitinib, osimertinib, and almonertinib. The patients in the combination group underwent EGFR-TKIs combined with anti-angiogenic drugs or chemotherapy. The antiangiogenic drugs include bevacizumab and anlotinib. The chemotherapy regimens include pemetrexed and carboplatin or cisplatin. There was no direct involvement of human tissues.
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