Approximately 50 patients will undergo two research PET/CT scans with \[18F\]F AraG at two time points. Each patient will receive two 5 (+/-10%) mCi doses of \[18F\]F AraG, one for each imaging time point. Eligible subjects will undergo a pre-treatment \[18F\]F AraG PET/CT scan within 7 days prior to treatment, followed by treatment, and an on-treatment \[18F\]F AraG PET/CT within 7-14 days of treatment.
Objectives:
* Quantify \[18F\]F-AraG uptake in advanced NSCLC tumor (primary, nodal, and metastatic sites) at baseline and after 1 dose of anti-PD-1/PD-L1 therapy in patients treated with standard of care immunotherapy (as monotherapy or part of combination therapy).
* Correlate change in \[18F\]F AraG uptake in tumor lesions with radiographic response.
