He was diagnosed with lung adenocarcinoma cT4N3M1c stage IVb and was EGFR-positive (according to the eighth edition TNM classification, innumerable nodules in the ipsilateral lobes were categorized as T4, and those in a contralateral lobe while multiple metastases in distant organs were M1, bilateral hilar and mediastinal lymphadenopathy were N3). Here, EGFR is linked to lung adenocarcinoma.