By testing tumors, researchers hoped to identify women who could avoid chemotherapy without increasing their risk of a cancer recurrence. Voisin/Phanie/Science Source hide caption

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Study Of Breast Cancer Treatment Reveals Paradox Of Precision Medicine

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Scientists Engineer An Opioid That May Reduce Pain With Less Risk

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Health insurance plans may exclude coverage for many types of genetic testing that aren't required by law. Andrew Brookes/Getty Images hide caption

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When Pregnant Women Need Medicine, They Encounter A Void

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Diabetes alert dogs are trained to detect low blood glucose in a person. The dogs can cost $20,000, but little research has been done on their effectiveness. Frank Wisneski/Flickr hide caption

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Between 1999 and 2014, the number of deaths in the U.S. from prescribed opioids quadrupled. Meanwhile medical students were getting very little training on how to spot patients who are at risk for addiction, or how to treat it. Matt Lincol/Getty Images/Cultura Exclusive hide caption

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New drugs like Harvoni effectively cure hepatitis C, but they haven't yet been approved for use in children. Lloyd Fox/Baltimore Sun/TNS via Getty Images hide caption

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Kathy Snook, Terri Anderson and Gary Snook traveled from Montana to Dr. Forest Tennant's office in West Covina, Calif. Corin Cates-Carney/Montana Public Radio hide caption

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Montana's 'Pain Refugees' Leave State To Get Prescribed Opioids

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A demonstration dose of Suboxone film, which is placed under the tongue. It is used to treat opioid addiction. M. Spencer Green/AP hide caption

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Maryland Switches Opioid Treatments, And Some Patients Cry Foul

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