Top medical news headlines for the week 22

Why some cancers are worse than others

Megan Sweet slices tumors. A normal day in the lab finds the Virginia Tech graduate student with hands deep inside a refrigerated metal box, pulling a mounted mouse-grown tumor incrementally closer to a razor-sharp blade. ...

New genetic map of the human eye reveals clues to vision loss

An international team led by University of Manchester scientists has created the most detailed picture yet of how genetic differences shape the way the human eye works. The breakthrough could help explain why millions of ...

Three medical routines that older people may not need

Enough time had passed since the patient's previous colonoscopy that she met the criteria to undergo another, said Dr. Steven Itzkowitz, a gastroenterologist at the Icahn School of Medicine at Mount Sinai in New York.

Parkinson's symptoms trace to distinct brain circuits

Parkinson's disease is often treated as a single disorder. But for the more than 1.1 million people living with it in the United States, the disease can look different from one person to the next. Research from Carnegie Mellon ...