Rash and Endocrine Disorders Predict Improved Survival in Metastatic Renal Cell Carcinoma Treated With Immunotherapy

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Background/Aim: Immune-related adverse events (irAEs) are associated with improved clinical outcomes in patients with metastatic renal cell carcinoma (mRCC) treated with immuno-oncology therapy. However, various irAEs occur during such therapy. In this study, we analyzed the association between irAEs and prognosis of patients with mRCC treated with nivolumab and ipilimumab. Patients and Methods: We retrospectively collected data from 193 patients with mRCC who were treated with nivolumab and ipilimumab as first-line treatment between September 2018 and February 2023 at multiple institutions. We performed Cox proportional hazards analysis for progression-free (PFS) and overall (OS) survival to identify specific irAEs associated with prognosis. Results: Among the 153 eligible patients (median age=68 years; range=27-86 years, the median PFS was 7.8 months (95% confidence interval=6.0-12.5 months), and the median OS was 34.0 months (95% confidence interval=23.9 months - not reached). The most common irAEs were endocrine disorder (28.8%), rash (18.3%), pulmonary disorder (10.5%), and liver dysfunction (9.8%). In the multivariate analysis, endocrine disorder-related irAEs were identified as prognostic factors for significantly better PFS and OS. Additionally, rash-related irAEs were significant prognostic factors, specifically for better OS (p<0.05). Conclusion: Both rash and endocrine disorder-related irAEs were predictors of survival outcomes in patients with mRCC treated with nivolumab and ipilimumab. Optimal management of these irAEs is essential for improving prognosis.

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