Introduction: Ipilimumab plus nivolumab has been approved for intermediate- and poor-risk metastatic renal cell carcinoma (RCC). However, the activity in non-clear cell RCC (nccRCC) is unknown.
Patients And Methods: Patients from Cleveland Clinic and the University of Texas Southwestern who had received ipilimumab plus nivolumab for metastatic nccRCC from October 2017 to May 2019 were retrospectively identified. Ipilimumab plus nivolumab was administered in accordance with the CHECKMATE 214 trial. Imaging was obtained at baseline and every 12 weeks. The baseline patient characteristics, objective response per Response Evaluation Criteria in Solid Tumors, version 1.1, and treatment-related adverse events (TRAEs) per Common Terminology Criteria for Adverse Events, version 5.0, were analyzed.
Results: Eighteen patients were identified. The median age was 59 years (range, 32-81 years), 77.8% were men, and the Eastern Cooperative Oncology Group performance status was 0 (38%) or 1 (50%). The median treatment duration was 2.4 months (range, 0.7-12.3 months). The non-clear cell histologic types included 6 papillary, 5 chromophobe, 3 unclassified, 2 adenocarcinoma of renal origin, 1 translocation, and 1 medullary. Most had an intermediate (66%) or poor (22%) International Metastatic Database Consortium risk. The best objective response included 6 partial responses (PRs; 33.3%) and 3 with stable disease (16.7%). Of the patients with a PR, the median time to the best response was 3.0 months, and median duration of the PR was 4.3 months. The median progression-free survival was 7.1 months. All-grade TRAEs were noted in 11 patients (61.1%) and included colitis (22%), hepatotoxicity (16%), rash (11%), and fatigue (11%). Eleven patients (61%) had TRAEs requiring high-dose glucocorticoids (> 40 mg of prednisone equivalent daily).
Conclusions: Ipilimumab plus nivolumab demonstrated objective responses and notable toxicity in patients with nccRCC.
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