⁸⁹Zr-Df-IAB22M2C (CD8 PET Tracer) for PET/CT in Patients With Metastatic Solid Tumors

The purpose of this study is to evaluate the safety of repeat doses ⁸⁹Zr-Df-IAB22M2C and to establish the relationship between ⁸⁹Zr-Df-IAB22M2C PET/CT lesion uptake with CD8+ cells by immunohistochemical staining in patients with selected advanced and metastatic solid malignancies who are scheduled to receive standard of care immunotherapy. The study will also evaluate uptake of ⁸⁹Zr-Df-IAB22M2C by PET/CT in patients at baseline and on immunotherapy.

Protocol IAB-CD8-201 is a Phase II, Open Label, Multi-Dose Study of ⁸⁹Zr-Df-IAB22M2C (CD8 PET Tracer) for Positron Emission Tomography (PET/CT) in Patients with Advanced or Metastatic Melanoma, Non-Small Cell Lung Cancer, Renal Cell Carcinoma, Squamous Cell Carcinoma of the Head and Neck Selected to Receive Standard-of-Care Immunotherapy as Single Agent or in Combination. This study will evaluate the safety of repeat doses of ⁸⁹Zr-Df-IAB22M2C, assess and quantify any detectable changes in ⁸⁹Zr-Df-IAB22M2C uptake from Baseline to post-Treatment, establish the relationship of ⁸⁹Zr-Df-IAB22M2C uptake in tumors with CD8+ TIL density, biodistribution, evaluate the variance in participants’ gene expression pre- and post-Treatment, evaluate the correlation of ⁸⁹Zr-Df-IAB22M2C uptake with clinical response by RECIST 1.1/iRECIST and evaluate the correlation of ⁸⁹Zr-Df-IAB22M2C uptake with immune infiltrates and other molecular biomarkers (CD4, CD8, PD-1 and PD-L1) expression by IHC.

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