irAE: immune-related adverse event; OR: odds ratio; CI: confidence interval; ECOG PS: Eastern Cooperative Oncology Group Performance Status; UTUC: upper urinary tract urothelial carcinoma; UC: urothelial carcinoma; ICI: immune checkpoint inhibitor; LDH: lactase dehydrogenase; CRP: C-reactive protein; NLR: neutrophil-to-lymphocyte ratio; PLR: platelet-to-lymphocyte ratio; NER: neutrophil-to-eosinophil ratio; SII: systemic immune-inflammation index; mGPS: modified Glasgow Prognostic Score; PNI: prognostic nutritional index. This evidence concerns the gene CRP and urothelial carcinoma.