Safety and toxicity of Iopofosine I 131 (CLR 131) with external beam radiation therapy in recurrent or metastatic head and neck cancer: results of a phase 1 single-centre, open-label, single-arm, dose escalation and dose expansion study

National Institutes of HealthP50 DE026787, National Cancer InstituteP30 CA014520, National Institutes of Health1UL1TR002373, Cellectar, NCT04105543.