The present invention provides a novel method of obtaining data for predicting the onset of an adverse event due to administration of at least one antibody drug selected from an anti-PD-1 antibody, an anti-PD-L1 antibody, an anti-CTLA4 antibody, and an antigen-binding fragment thereof, or a novel method of predicting the onset of the adverse event. More specifically, the present invention provides a method of obtaining data for predicting the onset of an adverse event or a method of predicting the onset of the adverse event, comprising measuring a level of at least one marker selected from sCD163 and CXCL5 in a biological sample collected from a subject administered the antibody drug.
