Acquired Driver Fusions as a Mechanism of Resistance to Selective RET Inhibitors in Advanced Medullary Thyroid Carcinoma. - Hamidi, Sarah; Subbiah, Vivek; Cabanillas, Maria E.; Sherman, Steven I.; Vodopivec, Danica M.; Dadu, Ramona; Hu, Mimi I. (JCO Precision Oncology, 2026)