A frequency of 422 skin cancers per 100,000 population, documented by positive biopsy counts occurred in the area of southern Arizona serviced by the city of Tucson. The figure is 20% above the highest reported for any area previously, and 34% above the highest documented report in the literature.
Schreiber MM, Shapiro SI, Berry CZ, Dahlen RF, Friedman RP. The Incidence of Skin Cancer in Southern Arizona (Tucson). Arch Dermatol. 1971;104(2):124-127. doi:10.1001/archderm.1971.04000200012003