Racial and Ethnic Differences in Breast Cancer Patients: A Study for Michigan and California
نویسندگان
چکیده
Background: Breast cancer is a leading cause of cancer death for women. Disparities in patient survival should be investigated to improve treatment and prevention methods. The SEER cancer registries have collected most of the breast cancer data for Michigan and California compared to other states. It is important to discern whether there are racial and ethnic differences in age of diagnosis and survival times for the breast cancer patients. Therefore, this study examines variations in age of diagnosis and survival time for breast cancer patients in California and Michigan for four ethnic populations: White Hispanics, White non-Hispanics, Black Hispanics, and Black non-Hispanics. Methods: This study used SEER data from 1973-2012 with 1,000 randomly selected subjects from each ethnic group (except Black Hispanics). Patient data were analyzed for each state based on the mean age of diagnosis and mean survival time. The Cox Proportion Hazard Ratio method and a goodness-of-fit assessment compared survival probability between both states. A cross-tabulation analysis compared different age categories and race. Results: The White Hispanic population in California had a significantly higher mean age of diagnosis than White Hispanics in Michigan (59.2 ±14.6 versus 56.9 ± 13.9 years; p < 0.001). Survival times for White non-Hispanics, Black non-Hispanics, and Black Hispanics in California were significantly higher (p <0.05) than survival times for those ethnic groups in Michigan. The goodnessof-fit probability test contributed two main probability distributions, t-distribution and Chi-squared distribution, that showed the best fit among the various ethnic groups in both states. Conclusion: Racial disparities exist within survival time and age of diagnosis statistics of breast cancer patients in California and Michigan. These findings can be used by healthcare professionals to create population-specific prevention methods to reduce racial and ethnic disparities among breast cancer patients.
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