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NPR's Kelly McEvers talks with professor Christian Herbst, who was part of the team that released a study that explores the science behind Freddie Mercury's amazing voice. This story originally aired on April 25, 2016 on All Things Considered.

Copyright 2016 NPR. To see more, visit http://www.npr.org/.

ROBERT SIEGEL, HOST:

Updated at 7:10 p.m. ET

Like a lot of people's grandmothers, Flonzie Brown-Wright keeps a candy jar in the living room of her single-story home, which is also adorned with potted plants and family photos.

A major study about the best way to treat early-stage breast cancer reveals that "precision medicine" doesn't provide unambiguous answers about how to choose the best therapy.

"Precision doesn't mean certainty," says David Hunter, a professor of cancer prevention at Harvard's T.H. Chan School of Public Health.

That point is illustrated in a large study published Wednesday in the New England Journal of Medicine, involving decisions about chemotherapy.

Copyright 2016 NPR. To see more, visit NPR.

Copyright 2016 NPR. To see more, visit http://www.npr.org/.

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