This is a pilot, prospective, observational study to estimate the degree to which baseline and early interval 18F-FDG PET/CT imaging within 3-4 weeks of ICI therapy initiation can accurately correlate with ctDNA level trends, predict clinical response, onset of immune-related adverse events, and survival outcomes in advanced stage melanoma patients.
Primary Objective
• To determine if early interval response assessment with 18F-FDG PET/CT during initial treatment with ICI therapy at 3-4 weeks correlates with ctDNA level changes in advanced melanoma patients.
Secondary Objectives
* To determine if early interval response assessment with 18F-FDG PET/CT during initial treatment with ICI therapy at 3-4 weeks predicts clinical efficacy at standard disease assessment time points in advanced melanoma patients.
* To assess if early interval response assessment with 18F-FDG PET/CT predicts development of clinical irAEs in advanced melanoma patients.
* To assess if early interval response assessment with 18F-FDG PET/CT and ctDNA level predicts progression-free survival (PFS) in advanced melanoma patients.
* To assess if early interval response assessment with 18F-FDG PET/CT and ctDNA level predicts overall survival (OS) in advanced melanoma patients.
