Moss and colleagues assessed disparities in cancer mortality by county-level persistent poverty, that is, whether counties continuously experienced high levels of poverty since 1980. The authors merged 2007 to 2011 data from the National Center for Health Statistics (cancer mortality rates) and American Community Survey (poverty classifications). Overall cancer mortality rates were 12.3% higher in persistent poverty counties versus all others, and 9.6% higher in persistent versus current poverty counties, with even greater disparities observed for specific cancer sites. Persistent poverty counties have exceptionally high cancer mortality, and targeted research, policy, and intervention efforts are needed to reduce these geographic disparities in cancer.

Many studies have shown that patients with Alzheimer disease are at decreased risk of cancer, but this inverse relation is likely to be biased by surveillance and survival bias. To overcome such bias, van der Willik and colleagues determined the relation between plasma amyloid-β levels—a preclinical feature...

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