RET and medullary thyroid gland carcinoma: In May 2020, selpercatinib (RETEVMO, Eli Lilly Company) was approved by the FDA for metastatic RET fusion-positive non-small cell lung cancer (NSCLC) in adult patients and advanced or metastatic RET-mutant medullary thyroid cancer (MTC) in adult and pediatric (≥12 years old) patients [15].