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Incidence, mortality, and risk factors of acute kidney injury after immune checkpoint inhibitors: Systematic review and meta-analysis of real-world evidence.

BACKGROUND: To precisely quantify the incidence, mortality, and risk factors for acute kidney injury (AKI) following immune checkpoint inhibitor (ICI) treatment for cancer in real-world scenarios.

METHODS: Comprehensive searches were performed on PubMed, EMBASE and the Cochrane library. Real-world observational studies reporting incidence, mortality and/or factors for AKI in ICI-treated patients were eligible. Odds ratio (OR) with 95% CI for potential predictors and hazard ratio (HR) with 95% CI for mortality risk associated with AKI were calculated using the random-effect model.

RESULTS: Eighteen articles comprising 12,111 patients receiving ICI were finally eligible. The pooled incidence was 16.0% (95% CI 11.2%-20.8%; n = 15) for AKI following ICI therapies overall and 3.5% (95% CI 2.1%-4.9%; n = 8) for ICI-induced AKI. Patients who developed AKI during ICI therapies had 51% increased risk of death compared with those without (HR 1.51, 95% CI 1.07-2.14). Regarding risk factors, statistically increased risk for AKI during ICI therapies was observed with preexisting chronic kidney diseases (OR 1.86, 1.25-2.78), diabetes (OR 1.26, 1.04-1.53), and concomitant extrarenal immune-related adverse events (OR 2.53, 1.79-3.56). Ipilimumab (OR 2.18, 1.43-3.32), combined ICI therapies (OR 1.80, 1.14-2.83) and concomitant use of proton pump inhibitors (OR 1.97, 1.56-2.49), renin-angiotensin system inhibitors (OR 1.50, 1.05-2.14), diuretics (OR 1.69, 1.27-2.26) also significantly predicted the incident AKI.

CONCLUSIONS: AKI episode is frequently observed during ICI exposure for cancer treatment, but ICI induced nephrotoxicity is only occasionally. Higher risk of AKI during ICI therapies was significantly associated with specific comorbidities, concomitant of certain drugs, ipilimumab and ICI combination therapies.

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