{Reference Type}: Case Reports {Title}: Response to selpercatinib in a patient with RET fusion-positive pulmonary large-cell neuroendocrine carcinoma: A case report. {Author}: Arora A;Zaemes J;Ozdemirli M;Kim C; {Journal}: Front Oncol {Volume}: 13 {Issue}: 0 {Year}: 2023 {Factor}: 5.738 {DOI}: 10.3389/fonc.2023.1134151 {Abstract}: Large-cell neuroendocrine carcinoma (LCNEC) is a rare subtype of non-small-cell lung cancer associated with a poor prognosis. LCNEC is genetically heterogeneous, and studies have revealed distinct molecular subtypes of LCNEC, which may have therapeutic implications. Herein, we present a case of a patient with stage IV LCNEC harboring a KIF5B-RET fusion whose disease responded to the selective RET inhibitor selpercatinib both extra- and intra-cranially, highlighting the importance of comprehensive molecular testing in LCNEC for selection of optimal treatment.