Real-World Data from a Metastatic Renal Cell Carcinoma Community-Academic Registry: Comparative Outcomes of Progression Free Survival and Overall Survival

Background: No studies have looked at comparative outcomes in the treatment of metastatic renal cell carcinoma (mRCC) between academic and community practice settings. Methods: We created a joint academic (ACAD) and community (COMM) retrospective registry of patients treated for mRCC. This registry represents a collaboration of an academic research network (Duke Oncology Network; Durham, NC) and a community-based oncology network (ACORN Research; Memphis, TN) of multiple member practices. We compared progression free survival and overall survival between these centers. We included patients diagnosed with mRCC after January 1, 2007 and before February 7, 2011. Results: Four hundred and fifty-five patients were captured in the registry including N = 255 COMM patients and N = 200 ACAD patients. Initial analysis of COMM patients showed a median PFS of 6.24 months [95% CI, 5.4, 7.5], 3.88 months [95% CI, 3.0, 4.8], and 3.35 months [95% CI 2.9, 4.4] with first, second, and third line systemic therapy. ACAD patients had longer median PFS estimates of 11.3 months [95% CI, 7.5, 13.6], 4.4 months [95% CI, 2.7, 8.9], and 5.22 months [95% CI, 2.7, 6.3] respectively. Median OS was 12.06 months [95 % CI 8.7, 15.4] among COMM patients and 36.73 months [95% CI, 26.2, 42.2) among ACAD patients. Differences persisted with inclusion of well-established prognostic models and predictive factors such as treatment exposures. Conclusions: There may be differences between outcomes for mRCC patients in community versus academic settings; however, selection most likely plays a role and we need further studies to determine reasons for these potential disparities. A prospective metastatic renal cell carcinoma (MaRCC) registry has been accrued encompassing sixty academic and community treatment sites across the United States, with the goal of examining real-world treatment patterns and outcomes; MaRCC may shed further light on any potential outcomes differences.