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First-in-Human Trial of Epichaperome-Targeted Positron Emission Tomography in Cancer Patients.

PURPOSE
124I-PU-H71 is an investigational first-in-class radiologic agent specific for imaging tumor epichaperome formations. The intracellular epichaperome forms under cellular stress and is a clinically validated oncotherapeutic target. We conducted a first-in-human study of microdose 124I-PU-H71 for positron emission tomography (PET) to study in vivo biodistribution, pharmacokinetics, metabolism, and safety; and the feasibility of epichaperome-targeted tumor imaging.


EXPERIMENTAL DESIGN
Adult patients with cancer (n=30) received 124I-PU-H71 tracer (201±12 MBq, <25 μg) IV bolus followed by PET/CT scans and blood radioassays.


RESULTS
124I-PU-H71 PET detected tumors of different cancer types (breast, lymphoma, neuroblastoma, genitourinary, gynecologic, sarcoma, and pancreas). 124I-PU-H71 was retained by tumors for several days while it cleared rapidly from bones, healthy soft tissues, and blood. Radiation dosimetry is favorable and patients suffered no adverse effects.


CONCLUSIONS
Our first-in-human results demonstrate the safety and feasibility of non-invasive in vivo detection of tumor epichaperomes using 124I-PU-H71 PET, supporting clinical development of PU-H71 and other epichaperome-targeted therapeutics.