Abstract
Background
Bone metastases (BM) in renal cell carcinoma (RCC) patients are associated with poor outcomes. There are limited published data on outcomes in these patients with immunotherapy agents. We present a multi-institutional, retrospective analysis of metastatic RCC patients with BM treated with ipilimumab and nivolumab (I + N).
Objective
Patient, tumor, and treatment-related variables were retrospectively collected from electronic medical records of patients with a histologically confirmed diagnosis of RCC and at least one radiographically confirmed BM prior to initiation of I + N. Best objective response was assessed by clinical chart review, imaging reports, and treating physician evaluation; progression-free survival (PFS) and overall survival (OS) were recorded as of 31 December 2020. Descriptive statistics were used to summarize patient characteristics and BM-related variables. Kaplan-Meier method and Mantel-Haenszel log-rank test were used to compare survival among groups. Cox regression univariable and multivariable models were used to correlate patient- and treatment-related variables to outcomes.
Results
Eighty patients with RCC and BM treated with I + N were identified. Patients were predominantly male and Caucasian presenting primarily with IMDC intermediate or poor-risk clear-cell RCC. Best response to I + N was progressive disease (46%), stable disease (28%), partial response (21%), and not evaluable (5%). Median PFS was 6.1 months (95% CI 3.8–8.9 months) with the majority of patients (65%) discontinuing I + N due to disease progression. Median OS was 25.6 months (95% CI 14.9–NA) with median follow-up of 25.2 months. A multivariable regression model for PFS showed several variables to be significantly associated with worse PFS including female gender [p = 0.02; hazard ratio (HR) 2.16; 95% CI 1.14–4.12], metastases to other sites (p = 0.006; HR 2.12; 95% CI 1.24–3.62) and presence of BM to ribs (p = 0.0007; HR 2.61; 95% CI 1.50–4.52). A multivariable Cox model of OS showed no prior radiation therapy to BM (p = 0.02; HR 2.17; 95% CI 1.13–4.17) and presence of liver metastases (p = 0.0006; HR 3.19; 95% CI 1.65–6.19) to be significantly associated with worse OS.
Conclusion
RCC patients with ≥ 1 BM who received I + N therapy had a relatively low response rate, PFS, and OS. Strategies to improve outcomes in this subset of patients are needed.
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Dr. Kunal Desai declares the following relationship: Consulting with Tyra BioSciences and CinRx. Dr. Landon Brown declares the following relationships: Consulting with Seattle Genetics. Wei Wei declares that he has no conflicts of interest that might be relevant to the contents of this article. Dr. Matthew Tucker declares that he has no conflicts of interest that might be relevant to the contents of this article. Dr. Chester Kao declares that he has no conflicts of interest that might be relevant to the contents of this article. Dr. Emily Kinsey declares that she has no conflicts of interest that might be relevant to the contents of this article. Dr Brian Rini declares the following relationships: Research funding (to Vanderbilt University) from Pfizer, Hoffman-LaRoche, Incyte, AstraZeneca, Taris, Seattle Genetics, Arrowhead Pharmaceuticals, Immunomedics, BMS, Mirati Therapeutics, Merck, Surface Oncology, Dragonfly Therapeutics, Aravive and Exelixis; Consulting with Bristol Myer Squibb, Pfizer, Roche/Genentech, Aveo, Synthorx, Compugen, Merck, Corvus, Surface Oncology, 3DMedicines, Aravive, Alkermes, Arrowhead, GSK, Shionogi, and Eisai. Stock ownership in PTC Therapeutics. Dr. Kathryn Beckermann declares the following relationships: Research funding (to Vanderbilt) from BMS-IASLC-LCFA for a young investigator award. Consulting with Exelexis. Dr. Tian Zhang declares the following relationships: Research funding (to Duke University) from Pfizer, Janssen, Acerta, Abbvie, Novartis, Merrimack, OmniSeq, PGDx, Merck, Mirati, Astellas, and Genentech; Speaking with Genomic Health and Sanofi Aventis; Consulting with AstraZeneca, Bayer, Pfizer, Foundation Medicine, Janssen, Merck, Amgen, MJH Associates, and BMS. Stock ownership/employment (spouse) from Capio Biosciences, Archimmune Therapeutics and Nanorobotics. Dr. Moshe Ornstein declares the following relationships: Consulting with BMS, Merck, Pfizer, Aveo, Exelixis, and Eisai.
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Collection and analysis of patient-level data for this article was approved by the participating institutions (Cleveland Clinic IRB-approved protocol 19-609, Duke University IRB-approved protocol Pro00101984, and Vanderbilt University IRB-approved protocol 160979).
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Dr. Desai wrote the majority of the content of the manuscript and collected patient data for Cleveland Clinic. Drs. Brown and Tucker edited the manuscript and collected patient data at Duke University and Vanderbilt University, respectively. Mr. Wei Wei conducted the statistical analysis for this article and wrote the statistics-related content. Drs. Kao and Kinsey collected patient data for Duke University. Drs. Rini, Beckermann, Zhang, and Ornstein provided editorial input for the article.
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Desai, K., Brown, L., Wei, W. et al. A Multi-institutional, Retrospective Analysis of Patients with Metastatic Renal Cell Carcinoma to Bone Treated with Combination Ipilimumab and Nivolumab. Targ Oncol 16, 633–642 (2021). https://doi.org/10.1007/s11523-021-00832-3
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DOI: https://doi.org/10.1007/s11523-021-00832-3