Immortal time bias in the association between toxicity and response for immune checkpoint inhibitors: A systematic review and meta-analysis.

e15080 Background: A number of studies have addressed the association between Immune related Adverse Events (IrAE) and outcome in patients treated with Immune Checkpoint Inhibitors (ICI). Only a minority of them considered the effect of immortal time bias (ITB), and results of these papers are conflicting. The aim of our meta-analysis was to assess the relationship between IrAE and outcomes for patients treated with ICIs, with a focus on ITB in...