Rural Cancer control: bridging the chasm in geographic health inequity

Abstract

Studies have shown time after time that where people live can affect what diseases they get, how they die, and when they die (1–6). In 2017, about 15% of the U.S. population, about 46 million people, lived in rural areas. Although geography alone cannot predict cancer risk, it can impact prevention, screening, diagnosis, and treatment opportunities. The articles in this special CEBP Focus issue on rural cancer control explore geographic disparities across the cancer control continuum in several distinct rural communities and map out potential paths to reach geographic health equity (7–12).Cancers of the female breast, prostate, lung, and colorectal cancers are the most common cancers in the United States, in both rural and metropolitan areas (6). However, people who live in rural areas, compared with people who live in the metropolitan areas, tend to have lower incidence rates for several cancer types that could be detected through screening and diagnostic imaging services (e.g., female breast, prostate, thyroid, and kidney cancers), but higher incidence rates for smoking-related cancers (e.g., lung and bladder cancer) and human papillomavirus (HPV)-related cancers (e.g., cervix cancer). Death rates are higher in persons residing in rural than metropolitan areas for many cancer types, particularly those amenable to primary prevention [e.g., lung cancer (Fig. 1A) and cervical cancer (Fig. 1B)], screening and early detection (e.g., colorectal cancer; Fig. 1C), quality cancer treatment and cancer survivorship care (e.g., prostate cancer, Fig. 1D). Moreover, progress in reducing cancer death rates for all cancers combined and for most common cancers has been slower in rural than in urban areas, further widening the disparity in mortality (Fig. 2).Factors contributing to slower progress and higher burden of cancer in rural areas are multifactorial and include economic, social, and structural barriers. Persons residing in rural areas were more likely to live below the Federal poverty level (16%) than those residing in metropolitan areas (12%) and less likely to have medical insurance (13% vs. 10%; Fig. 3A; ref. 13), potentially limiting access to the recommended preventive, early detection, and treatment services (14–16). Prevalence of cigarette smoking, obesity, and physical inactivity, common risk factors for many cancer types (17), were higher among residents of rural areas than among residents of metropolitan areas (Fig. 3B; refs. 13, 18). Comprehensive tobacco prevention and control programs are proven to reduce smoking prevalence (19, 20); however; tobacco control efforts such as smoke-free policies, excise taxes on tobacco products, and accessibility to smoking cessation resources tend to be lower in rural areas compared with metropolitan areas (13). Vaccination uptake rates for HPV among adolescent boys and girls were lower in rural areas than in metropolitan areas, potentially impacting future cancer burden, (Fig. 3C; ref. 21) despite the availability of the vaccine to children to low-income families at no cost through a Federal program, Vaccines for Children (22). However, vaccination rates for hepatitis B virus among children were high (>90%) in both rural and metropolitan areas (Fig. 3C), suggesting that barriers other than cost may impact low HPV vaccination rates. According to data from the 2015 National Health Interview Survey, the prevalence of receiving recommended screening tests for female breast, colon and rectum, and cervical cancers (Fig. 3D) were lower in persons residing in rural areas than among residents of metropolitan areas (13). Lower adherence to screening could be due to factors such as barriers to transportation to screening facilities, unaffordable screening tests, insufficient number of local screening facilities, or shortage of trained personnel, such as radiologists (6, 23). Persons residing in rural areas may be less likely to receive guideline concordant treatments. For example, receipt of radiotherapy for patients with breast cancer residing in the NCI's Surveillance, Epidemiology, and End Results program was lower for rural (62.1%) than urban (69.1%) patients (24). There are fewer primary healthcare providers and specialists in rural areas that may limit access to timely and high-quality prevention, early detection, treatment, and survivorship care services.In this special CEBP Focus issue, six articles share new insights into cancer disparities in rural communities. An article by Zahnd and colleagues examines cancer incidence rates and trends by demographic, geographic, and socioeconomic characteristics based on a multistate database, covering 93% of the U.S. population, and confirms that cancer rates associated with modifiable risks, such as tobacco use and HPV infection, and some preventive screening modalities were higher in rural areas compared with urban areas (7). Zahnd and colleagues underscore the utility of such large and generalizable databases for monitoring the