Why does cancer cluster?
What do Florida sunbathers, midwestern farmers, rural black men, and Long Island women have in common?  They all have higher-than-average risks for certain cancers.  Researchers know that cancer clusters are usually caused by several factors.  As cancer becomes America's leading cause of death, the public will be keenly interested in sorting out the causes and reducing the risks.
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D016000:Cluster Analysis; D003710:Demography; D005260:Female; D006801:Humans; D008297:Male; D009369:Neoplasms / Q000453:epidemiology; D015995:Prevalence; D014481:United States