First-in-Human Assessment of Safety, Biodistribution and Pharmacokinetics of 18F-Fluoro-1-Naphthol (18F-4FN) for PET Imaging

Inclusion Criteria:

* Patient \>/= 18 years of age.
* Patients with histologic diagnosis of solid or liquid tumor treated by ICI with evidence of or clinical suspicion of irAE or patients with suspected inflammation.
* Normal range standard renal and liver function tests for age:

eGFR \>= 60 mL/min/1.73 m2

Adequate liver function:

Bilirubin ≤ the upper limit of normal (ULN) Alkaline phosphatase, alanine aminotransferase (ALT), and aspartate aminotransferase (AST) ≤ the ULN

Exclusion Criteria:

* Pregnant or lactating women: pregnant women are excluded from this study because the effects of \[18F\]4FN in pregnancy are not known. Urine or serum pregnancy test (female \</= 60 years of age or childbearing potential) within 24 hours of the PET scan.
* Subjects with contraindications to the use of \[18F\]4FN including confirmed allergy.
* Patients with a body weight of 400 pounds or more, or a BMI which precludes their entry into the bore of the PET/CT scanner, because the hardware is not intended to support that weight.
* Any additional medical condition, serious concurrent illness, or other extenuating circumstance that, in the opinion of the physician may significantly interfere with study compliance.
* Children below the age of 18 are excluded because of the unknown but potential risk of administration of radiopharmaceuticals to minors.