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  • Title: Everolimus Versus Temsirolimus in Metastatic Renal Cell Carcinoma After Progression With Previous Systemic Therapies.
    Author: Patel SB, Stenehjem DD, Gill DM, Tantravahi SK, Agarwal AM, Hsu J, Vuong W, Pal SK, Agarwal N.
    Journal: Clin Genitourin Cancer; 2016 Apr; 14(2):153-9. PubMed ID: 26781820.
    Abstract:
    BACKGROUND: Everolimus is an approved agent for use after disease progression with vascular endothelial growth factor receptor-tyrosine kinase inhibitors (VEGFR-TKIs) in patients with metastatic renal cell carcinoma. With recently published trials showing efficacy of nivolumab and cabozantinib in the second-line therapy setting, the use of everolimus will likely move to the third- or fourth-line therapy setting. Temsirolimus has occasionally been used instead of everolimus for many reasons, including financial considerations, assurance of patient compliance given its intravenous administration, its toxicity profile, patient performance status, and patient or physician preference. However, efficacy of everolimus and temsirolimus in this setting have not been compared in a randomized trial. The results from retrospective studies have been inconsistent. MATERIALS AND METHODS: We identified patients treated with a first-line VEGFR-TKI for metastatic renal cell carcinoma and then treated with either everolimus or temsirolimus on progression from the databases of 2 large academic cancer centers. Progression-free survival (PFS) and overall survival (OS) were assessed from the initiation of second-line treatment using the Kaplan-Meier method. RESULTS: A total of 90 patients received either everolimus (n = 59; 66%) or temsirolimus (n = 31; 34%) after progression during first-line VEGFR-TKI therapy. The patient and disease characteristics were similar in both groups. The median PFS was not different, but OS was superior with everolimus compared with temsirolimus (24.2 months vs. 12.1 months; hazard ratio, 0.58; P = .047). CONCLUSION: Our results bolster existing guidelines supporting everolimus over temsirolimus as salvage therapy after previous systemic therapies.
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