Which one of these sunscreens would be considered safe and correctly labeled by the Food and Drug Administration? Not a single one. Safe sunscreens are SPF15 or higher, and the new rules require those with broad-spectrum protection to include the term next to and in the same style as the sun protection factor. Benjamin Morris/NPR hide caption

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An American Cancer Society Relay for Life event at the University of Texas-Dallas in 2006. The events are meant to "celebrate the lives of people who have battled cancer, remember loved ones lost, and fight back against the disease," according to the organization. Josh Berglund/via Wikimedia Commons hide caption

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A woman pours two tablets into her hand from a pill bottle. iStockphoto.com hide caption

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Isabel Doran, 4, gets a CT scan at Children's National Medical Center with her mom, Veronica Doran. The X-ray radiation in CT scans raises the risks for cancer, including leukemia, a new study shows. Dayna Smith/The Washington Post/Getty Images hide caption

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Before the colonoscopy begins, it pays to ask your doctor some pointed questions. Sebastian Schroeder/iStockphoto.com hide caption

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Terry Dyroff, at home in Silver Spring, Md., got a PSA blood test that led to a prostate biopsy. The biopsy found no cancer, but it gave him a life-threatening infection. Jose Luis Magana/AP hide caption

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Alivia Parker, 21 months at the time, ran through circles of spraying water on a hot day in Montgomery, Ala., last June. She was wearing sunscreen with an SPF of 100, a rating that won't be allowed much longer. Dave Martin/AP hide caption

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Karen Lindsfor, a professor of radiology and chief of breast imaging at the University of California, Davis Medical Center, examines the mammogram of a patient with heterogeneously dense breast tissue. Lindfors is among those doctors who say there was insufficient evidence to support the idea that additional screenings would detect cancers earlier. Rich Pedroncelli/AP hide caption

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Staying fit and eating well can help cancer survivors, too, a review of the latest evidence shows. Lucy Pemoni/AP hide caption

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Dr. Steven Birnbaum positions a patient inside a CT scanner at Southern New Hampshire Medical Center in Nashua, N.H., in June 2010. Jim Cole/AP hide caption

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