Testing the Use of Targeted Treatment for RET Positive Advanced Non-small Cell Lung Cancer

This phase II Lung-MAP treatment trial tests whether carboplatin and pemetrexed with or without selpercatinib works to shrink tumors in patients with RET fusion-positive non-small cell lung cancer that is stage IV or has not responded to previous RET directed therapy. Chemotherapy drugs, such as carboplatin and pemetrexed, work in different ways to stop the growth of tumor cells, either by killing the cells, by stopping them from dividing, or by stopping them from spreading. Selpercatinib may stop the growth of tumor cells by blocking some of the enzymes needed for cell growth. Giving selpercatinib in combination with carboplatin and pemetrexed may help lower the chance of the cancer growing and spreading.