Association between calcitonin and efficacy of anlotinib in medullary thyroid carcinoma: An analysis based on the ALTER01031 trial.

6526Background: Calcitonin (Ct) is the most important biomarker for medullary thyroid carcinoma (MTC). In a randomized, placebo-controlled phase IIb trial (ALTER01031, NCT02586350) for MTC, anlotin...