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These two sites had good Authority:

Screenshot -
This is a fact sheet from the National Cancer Institute, which is the federal government's principal agency for cancer research.  Statistics cited are from NCI research studies, and from the National Center for Health Statistics.  This would be an authoritative site for data on this topic.

On the site you find this interesting chart about cancer. At the bottom of this chart are references for the data. The statistics come from the National Cancer Institute and the American Cancer Society. If you click on the "Home" link at the bottom of this page, you'll find the main page for the site which has a link to their mission and tells you that the Oncology Nursing Society sponsors the site. Though they are not using their own data for the statistics, it is still a relatively authoritative site.

These two sites were not as Authoritative:

Screenshot - Natl. Black Catholic Congress
This page provides some good information about cancer in black men and women, and does provide a citation for the statistics cited (from the Centers for Disease Control and Prevention and National Cancer Institute). However, the credentials of the author (an inspirational and business development speaker) indicate that this is not really an authoritative source.

Screenshot - Hanson Place
Again, this site does provide statistics from an authoritative source (NCI), but the author's degree in dentistry does not indicate that he would be an authority on cancer epidemiology.