Anti-PD-1: When to Stop Treatment.

Published studies indicate that disease control can be maintained after discontinuation of ICB therapy. Discontinuation of therapy in responders decreases the risk for treatment-related adverse events and lowers the financial burden of ICB. With the limitation of the limited and heterogenous available published data, elective treatment discontinuation after 1 year of treatment appears safe with an acceptable risk of disease progression. The depth of response is currently the best predictor of prolonged response. The metabolic response on 18F-FDG-PET/CT is expected to gain importance, especially for partial responders.