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Down Syndrome May Hold Clues to Fighting Cancer

Researchers Probe Why Those With Disorder Are Less Likely to Develop Certain Tumors

Researchers are working to unravel a medical mystery that they hope will lead to new ways to fight cancer: They're trying to figure out why people with Down syndrome are less likely to get certain common cancers than the general population, and why they respond better to treatment in other cancers.

Recent research shows that people with Down syndrome, a genetic condition with a range of physical and intellectual disabilities, have a significantly lower-than-expected rate of breast cancer, lung cancer, mouth cancer and other...