EGFR and non-small cell lung carcinoma: Even though next‐generation sequencing has improved the sensitivity of detection of ctDNA EGFR mutation status, the detection efficiency and quality cannot be guaranteed due to its high cost and nonstandard operation.17, 18 In addition, several studies have shown that the efficiencies of EGFR‐TKI in patients with EGFR‐mutant NSCLC can only reach about 70%.