Jung et al. reported data from 278 patients with AJCC v7 stage I–IIIA EGFR-mutated NSCLC who underwent curative surgery and had ctDNA measured pre-operatively, 4 weeks after curative surgery, and then every 3 months for the first year, every 4 months for the second year, every 6 months for the third year, and thereafter once every year until 5 years or clinically definite recurrence [43]. The gene discussed is EGFR; the disease is non-small cell lung carcinoma.