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.

After being informed about the study and potential risks, all patients giving written informed consent will be evaluated to determine eligibility for study entry. Up to 1 week prior to initiation of immunotherapy, patients will receive an injection of ⁸⁹Zr-Df-IAB22M2C (1.0 mCi) and will undergo PET/CT scanning to determine baseline uptake of ⁸⁹Zr-Df-IAB22M2C in tumor lesions and reference tissues. Patients will receive an additional injection of ⁸⁹Zr-Df-IAB22M2C (1.0 mCi) and PET/CT scan 4-6 weeks after starting immunotherapy (on-therapy) to evaluate uptake of ⁸⁹Zr-Df-IAB22M2C in tumor lesions and reference tissues, and to assess potential changes in uptake of ⁸⁹Zr-Df-IAB22M2C compared to the baseline scan.

Eligibility Criteria:
Inclusion Criteria:

Participants will be eligible for enrollment in the study only if they meet ALL of the following criteria:

1. 1. Patients with advanced or metastatic Melanoma, Non-Small Cell Lung Cancer, Renal Cell Carcinoma or Squamous Cell Carcinoma of the Head and Neck with at least one non-radiated lesion, who are scheduled to begin standard of care immunotherapy.
2. • At least 1 non radiated measurable lesion documented on CT/, MRI (per RECIST criteria 1.1) or are FDG avid on FDG-PET within 45 days prior to first 89Zr-Df-IAB22M2C (CD8 PET Tracer) infusion.
3. At least 1 non-cutaneous lesion that is accessible, per investigator's assessment, and eligible for biopsy. If only a single RECIST measurable lesion is present, investigator to determine if the tumor biopsy could interfere with RECIST assessments of response.
4. Eastern Cooperative Oncology Group (ECOG) performance status ≤ 2.
5. Meeting all clinical safety lab values per institution's standard of care, or Investigator's discretion, for patients receiving cancer treatment.
6. Age ≥ 18 years.
7. Ability to understand the purposes and risks of the trial and has signed an IRB-approved informed consent form.
8. Willingness and ability to comply with all protocol required procedures.
9. For men and women of child-producing potential, use of effective double barrier contraceptive methods during the study, up to 30 days after the last administration of the investigational product.

Exclusion Criteria:

Subjects will NOT be eligible for enrollment in the study if they meet ANY of the following criteria:

1. Serious nonmalignant disease or conditions that in the opinion of the investigator and/or ImaginAb could compromise protocol objectives.
2. Patients with a single RECIST measurable lesion, biopsy of which, per investigator's assessment, is likely to interfere with RECIST assessments of response.
3. Patients who have any splenic disorders, or had splenectomy, that in the opinion of the investigator and/or ImaginAb could compromise protocol objectives.
4. Pregnant women or nursing mothers.
5. 5. Life expectancy \< 6 months