Breast cancer drug Herceptin is one of the medicines that are typically covered by insurers but often at a high out-of-pocket cost for patients. Jeff J Mitchell/Getty Images hide caption

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Testing for prostate cancer has declined after a recommendation in 2012 said it shouldn't be routine. iStockphoto hide caption

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The dwarf tapeworm, or Hymenolepis nana, is the most common tapeworm in humans. It's 2 inches long at most. Courtesy Peter Olson, Natural History Museum, London hide caption

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For decades, black women faced lower risk of being diagnosed with breast cancer than did white women. ColorBlind Images/Blend Image/Corbis hide caption

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Alan Hoffman, shown with his wife, Nancy, at their home in Dumfries, Va., found that his Parkinson's symptoms improved when he took a cancer drug. Claire Harbage for NPR hide caption

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Ductal carcinoma in situ sometimes can turn into invasive breast cancer, but there's currently no test that can tell when it's dangerous and when it's not. Steve Gschmeissner/Science Photo Library/Corbis hide caption

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Ovarian tissue containing hundreds of small resting eggs is prepared to be transplanted back after cancer treatment. Courtesy of Claus Yding Andersen hide caption

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Six years after he was diagnosed with early onset Alzheimer's disease, Greg O'Brien is thinking differently about the future. Even as he fights to hold on to his memory, he and his wife, Mary Catherine, are discussing how to let go. Courtesy of Greg O'Brien hide caption

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The group of women in a new study with the lowest rate of breast cancer consumed about four tablespoons of olive oil each day. Heather Rousseau/NPR hide caption

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