EGFR and neoplasm: Interestingly, when the plasma specimens of the 93 tumor-tissue EGFR M+ patients were divided into two groups according to the results of the cfDNA test, the median cfDNA concentration of the cfDNA EGFR M+ group was much higher than that of the cfDNA EGFR M- group (11.61 ng/mL vs. 7.73 ng/mL, P = 0.003).