A new study from researchers in China and Singapore shows that a fatal hypersensitivity to the drug dapsone is based in genetics, and can be assessed before the drug is prescribed.

This year, award-winning starlet Angelina Jolie underwent a double mastectomy, after genetic testing showed an 87 percent chance that the actress would develop breast cancer. In light of Jolie's very public medical announcement, many women with a family history of cancer considered taking a similar genetic test.

Available…