Abstract C053: Testicular cancer in Hispanics: Incidence of subtypes over time according to neighborhood sociodemographic factors in California
Authors: DeRouen Mindy C , McKinley Meg , Shah Sumit A , Borno Hala T , Aoki Rhonda , Lichtensztajn Daphne Y , Leppert John T , Brooks James D , Chung Benjamin , Gomez Scarlett L , Cheng Iona 
Published: September 2020

Abstract
Background: Hispanic men in the U.S. experience the second-highest incidence rate of testicular cancer, behind non-Hispanic (NH) White men. Incidence of testicular cancer is increasing in the U.S., despite reports of a plateau during the 1990’s, and increases are especially steep in the Hispanic population. To date, the literature does not address whether the incidence of testicular cancer or the observed increases in incidence differ according to neighborhood factors. Purpose: We examined incidence rates and changes in incidence over time for testicular cancer histologic subtypes (i.e., seminoma and nonseminoma) according to neighborhood socioeconomic status (nSES) among Hispanic and, for comparison, NH White men, and according to neighborhood ethnic enclave among Hispanic men, using California Cancer Registry Data. Methods: We conducted a population-based study of 12,228 Hispanic and NH White men diagnosed with testicular cancer in California during three pericensal periods 1988-1992, 1998-2002, and 2008-2012. We calculated incidence rates according to nSES and, among Hispanics, according to ethnic enclave. Incidence rate ratios were calculated to compare incidence rates across nSES and ethnic enclave and to examine changes in incidence rates over time. Results: Hispanic men residing in high SES neighborhoods, compared to low SES neighborhoods, had greater incidence of both seminoma and nonseminoma testicular cancer across pericensal periods (2008-2012, high to low nSES, seminoma IRR, 1.67; 95% CI, 1.38-2.02 and nonseminoma IRR, 1.22; 95% CI, 1.00-1.48). Hispanic men residing in low ethnic enclave neighborhoods also had higher incidence of both seminoma and nonseminoma across pericensal periods. Between the periods 1998-2002 and 2008-2012, Hispanic men residing in low SES neighborhoods experienced increased incidence of seminoma (IRR, 2008-2012 compared to 1998-2002, 1.39; 95% CI, 1.17-1.65) while those residing in both low and middle SES neighborhood experienced increased incidence of nonseminoma (IRR, 2008-2012 compared to 1998-2002 for low nSES, 1.87; 95% CI, 1.57-2.20 and for middle nSES, 1.48; 95% CI, 1.21-1.79). Conclusions: While Hispanic men residing in neighborhoods with higher SES and lower enclave status have greater incidence of both seminoma and nonseminoma testicular cancer, recent increases in incidence are driven by Hispanic men residing in lower SES neighborhoods, particularly for the nonseminoma histologic subtype.
Citation Format: Mindy C DeRouen, Meg McKinley, Sumit A Shah, Hala T Borno, Rhonda Aoki, Daphne Y Lichtensztajn, John T Leppert, James D Brooks, Benjamin Chung, Scarlett L Gomez, Iona Cheng. Testicular cancer in Hispanics: Incidence of subtypes over time according to neighborhood sociodemographic factors in California [abstract]. In: Proceedings of the Twelfth AACR Conference on the Science of Cancer Health Disparities in Racial/Ethnic Minorities and the Medically Underserved; 2019 Sep 20-23; San Francisco, CA. Philadelphia (PA): AACR; Cancer Epidemiol Biomarkers Prev 2020;29(6 Suppl_2):Abstract nr C053.