BACKGROUND/AIM: Double diagnosis of lung cancer (LC) and ovarian cancer (OC) is rare. Here, we describe patients with synchronous/metachronous LC and OC to identify common clinical and pathological patterns.PATIENTS AND METHODS: Clinical, pathological and molecular data of patients diagnosed and treated at 30 European Institutions from 2008 to 2018 were retrieved and analysed. Whenever tissue was available, centralized pathology revision was performed.RESULTS: A total of 19 cases were found; one was excluded at pathology revision. Most LCs were adenocarcinomas (15/18) and most OCs were high-grade serous (15/18) carcinomas. Of the 9 patients analysed, 7 carried oncogene-addicted LC (4 EGFR, 1 B-RAF and 2 ALK) and five out of 7 carried BRCA mutations. One patient with a germline-BRCA1 mutation received olaparib, resulting in a durable response of both malignancies. Median overall survival was 33 months.CONCLUSION: In our series, most synchronous/metachronous LCs and OCs showed genetic alterations. Further analyses with wide NGS panel could shed light on the biological mechanisms driving their occurrence.