Single and combination immunotherapy with chemotherapy and the risk of AKI in patients with solid cancer

Background and objectives Acute kidney injury (AKI) has emerged as an important toxicity among patients with advanced cancer treated with immune checkpoint inhibitors. The aim of this study was to describe the incidence, risk factors and mortality of AKI in patients receiving immune checkpoint inhibitors alone or in combination with another form of immunotherapy or chemotherapy.Design, setting and participants We included all patients who received immune checkpoint inhibitors alone or in combination with another form of immunotherapy or chemotherapy at AC Camargo Cancer Center from January 2015 to December 2019. AKI was defined as a >= 1.5 fold increase in creatinine from baseline within 12 months of immune checkpoint inhibitor initiation. We assessed the association between baseline demographics, comorbidities, medications and risk of AKI using a competing risk model, considering death as a competing event.Results We included 614 patients in the analysis. The mean age was 58.4 +/- 13.5 years, and the mean baseline creatinine was 0.8 +/- 0.18 mg/dL. AKI occurred in 144 (23.5%) of the patients. The most frequent AKI etiologies were multifactorial (10.1%), hemodynamic (8.8%) and possibly immunotherapy-related (3.6%). The likelihood of AKI was greater in patients with genitourinary cancer (sHR 2.47 95% CI 1.34-4.55 p < 0.01), with a prior AKI history (sHR 2.1 95% CI 1.30-3.39 p < 0.01) and taking antibiotics (sHR 2.85 95% CI 1.54-5.27 p < 0.01).Conclusions In this study, genitourinary cancer, previous AKI and antibiotics use were associated with a higher likelihood of developing AKI.