Comparison of outcomes for Hispanic and non-Hispanic patients with advanced renal cell carcinoma in the International Metastatic Renal Cell Carcinoma Database.

Abstract

6590 Background: Epidemiologic studies suggest that Hispanic patients with renal cell carcinoma (RCC) have worse outcomes than non-Hispanic White patients (NHW). It is unclear if this disparity is related to inherent biological differences or patients’ social determinants of health (SDOH). Utilizing the International Metastatic Renal Cell Carcinoma Database (IMDC) of patients with RCC primarily receiving care at academic medical centers, we investigated outcomes of Hispanic and NHW patients with advanced RCC. Methods: Eligible patients included patients who self-reported being non-Black Hispanic or NHW with locally advanced or metastatic RCC initiating systemic therapy. The primary endpoint was overall survival (OS) and secondary endpoint was time to treatment failure (TTF) for the first-line therapy. Kaplan Meier curves were constructed for OS and TTF. Cox regression was used to estimate hazard ratios (HR) adjusted for confounding variables. Results: The cohort included 1,563 patients, of which 181 (11.6%) were Hispanic. Most patients were male (74%) with clear cell histology (82%). IMDC risk groups were 18%, 58%, 24% for favorable, intermediate, and poor risk, respectively, and were similar by ethnic groups. Compared to NHW, Hispanic patients were younger at diagnosis (median 57 vs 59 years, p = 0.036), less likely to have > 1 metastatic site (61% vs 77%, p < 0.001) and bone metastases (24% vs 33%, p = 0.009). 1,178 patients (124 Hispanic vs. 1,054 NWH) received treatment before 2018, 385 patients (57 Hispanic vs. 328 NWH) received treatment during or after 2018. With regards to first line therapy, the majority received tyrosine kinase inhibitor (TKI) monotherapy (70%), 10% received immunotherapy (IO) + IO, 9% received TKI + IO, 4% received IO monotherapy, and 8% received other treatments. Median TTF was 7.8 months (95% Confidence Interval (CI): 6.2-9.0) in Hispanic patients and 7.5 months (95% CI: 6.9-8.1) in NHW patients. On multivariable analysis, there was no significant difference in TTF between Hispanic and NHW patients (HR 1.05, 95% CI: 0.89-1.25, p = 0.558). Significant predictors of TTF were presence of unfavorable site of metastases, histology, IMDC risk group, and therapy type. Median OS was 38.0 months (95% CI: 28.1-59.2) in Hispanic patients and 35.7 months (95% CI: 31.9-39.2) in NHW patients. On multivariable analysis, there was no significant difference in OS between Hispanic and NHW patients (HR 1.07, 95% CI: 0.87-1.32, p = 0.544). Significant predictors of OS were number of metastatic sites, presence of unfavorable metastasis, histology, IMDC risk group, and therapy type. Conclusions: In this analysis, we did not detect a difference in OS or TTF for Hispanic patients with RCC. Our data suggest that access to care (as available in a tertiary cancer hospital) can mitigate the historic difference in outcomes in Hispanic versus NWH patients.