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  • Title: Prognostic impact of immune-related adverse events in metastatic renal cell carcinoma treated with nivolumab plus ipilimumab.
    Author: Ikeda T, Ishihara H, Nemoto Y, Tachibana H, Fukuda H, Yoshida K, Takagi T, Iizuka J, Hashimoto Y, Ishida H, Kondo T, Tanabe K.
    Journal: Urol Oncol; 2021 Oct; 39(10):735.e9-735.e16. PubMed ID: 34172370.
    Abstract:
    OBJECTIVES: Evidence regarding the prognostic impact of immune-related adverse events (irAEs) remains limited in patients with metastatic renal cell carcinoma (mRCC) treated with nivolumab plus ipilimumab as a first-line systemic therapy. Thus, we investigated the association between irAE development and oncological outcomes during nivolumab plus ipilimumab therapy. METHODS: We retrospectively evaluated 46 patients with mRCC who were treated with nivolumab plus ipilimumab at our hospital and its affiliated institutions. The associations between irAE development and progression-free survival (PFS), overall survival (OS), and objective response rates (ORRs) were assessed after treatment initiation. RESULTS: A total of 60 irAEs occurred in 33 patients (72%), with 24 grade ≥ 3 irAEs developed in 20 patients (43%). PFS was significantly longer in patients with irAEs than that in patients without irAEs (P < 0.0001); however, OS was not different (P = 0.571). Multivariable analysis further revealed that the development of irAEs was an independent predictor of a longer PFS (hazard ratio: 0.18, P = 0.0005). A landmark analysis for the initial four cycles of nivolumab plus ipilimumab administration also showed that PFS was significantly longer in patients with irAEs than that in patients without irAEs (P = 0.0386). The ORRs were also higher in patients with irAEs (P = 0.0064). Furthermore, in 22 patients (48%) who discontinued nivolumab plus ipilimumab treatment, the 6-month PFS rate was 87%. CONCLUSION: This multi-institutional study showed that irAE development was significantly associated with PFS but not with OS in patients treated with nivolumab plus ipilimumab as a first-line therapy. The development of irAEs may be used as a surrogate prognostic marker for PFS in this treatment regimen.
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