...we describe a case of advanced lung adenocarcinoma harboring a rare ALK-HLA-DRB1 (major histocompatibility complex, class II, DR beta 1) gene fusion. The patient achieved a rapid and remarkable response after crizotinib treatment. For economic reasons, 6 months later the patient was switched to receiving oral ceritinib, and she responded well. As of this writing, the progression-free survival of this patient is more than 18 months.