RET V804M + M918T

This global, open-label, randomized, controlled, phase III trial will compare selpercatinib to physician choice of cabozantinib or vandetanib in pts with MKI-naïve progressive advanced or metastatic RETmut MTC...Funding: Eli Lilly and Company. Clinical trial identification: NCT04211337.

Among the primary analysis set of patients with RET-mutant MTC previously treated with cabozantinib and/or vandetanib (N=55), the investigator-assessed objective response rate (ORR) per RECIST 1.1 was 56% (95% CI 42.3-69.7, n=31/55)...As previously reported, selpercatinib was well tolerated with an acceptable safety profile (1). These results indicate broad anti-tumor activity for selpercatinib in patients with RET-mutant MTC irrespective of the specific RET mutation, and support implementation of RET mutation testing for patients with advanced MTC, including somatic testing, to identify patients who may benefit from selpercatinib.