Abstract
This study explores the imaging and therapeutic properties of a novel radiopharmaceutical, 131I-CLR1404. Phase 1a data demonstrated safety and tumor localization by SPECT-CT. This 1b study assessed safety, imaging characteristics, and possible antineoplastic properties and provided further proof-of- concept of phospholipid ether analogues’ retention within tumors. A total of 10 patients received 131I-CLR1404 in an adaptive dose-escalation design. Imaging characteristics were consistent with prior studies, showing tumor uptake in primary tumors and metastases. At doses of 31.25 mCi/m2 and greater, DLTs were thrombocytopenia and neutropenia. Disease- specific studies are underway to identify cancers most likely to benefit from 131I-CLR1404 monotherapy.