MO404ACUTE KIDNEY INJURY DUE TO IMMUNE CHECKPOINT INHIBITORS (CPIS) NEPHROTOXICITY

Abstract

Abstract Background and Aims The approved therapeutic indication for immune checkpoint inhibitors (CPIs) are rapidly expanding; however the immune-related toxicities associated with CPIs can limit its efficacy. Case Report. A 52 year-old female diagnosed with left ocular melanoma and treated for 14 months with nivolumab developed non-oliguric, stage 3 (KDIGO), Acute Kidney Injury (AKI) and mixed proteinuria (0.6 g/day), then was transferred in our Unit. As known causes of AKI were excluded, kidney biopsy was performed. By Optical Microscopy, there were 33 normal glomeruli; arteries and arterioles were normal. The main damage was interstitial and characterized by tubulitis, tubular necrosis, non-isometric citoplasmatic vacuolization and diffuse, acute and chronic, CD4+, inflammatory infiltrate (Figure 1, 2). By Immunofluorescence, 27 glomeruli were negative for all eight tested antibodies (IgA, IgM, IgG, F, C3, C1q, kappa and lambda light chains). On the basis of these histological findings, Nivolumab-induced Acute Tubulo-Interstitial Nephritis was diagnosed. Nivolumab was discontinuated. Patient was treated by steroids and she achieved almost complete renal function recovery (Figure 3). Conclusions. CPIs can induce a long-term Acute Kidney Injury. Histological features are characterized by Acute Tubulo-Interstitial Nephritis. Steroids can improve renal outcome. In patients treated with CPIs a multidisciplinary management between oncologists and nephrologists is desirable for monitoring renal function at basal, after drug administration and in the long-term follow-up.