One of the biggest moments at the annual meeting of the American Society of Clinical Oncology last month came when a drug investigator from M.D. Anderson Cancer Center presented explained that a recent clinical trial for the drug Avastin had left doctors "with no more clarity" about how to treat brain cancer patients than they had before the trial, according to the New York Times.

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Senator Elizabeth Warren (D-Mass.) has released the results of a genetic ancestry analysis, the Boston Globe reports.

Retraction Watch's Ivan Oransky and Adam Marcus report that Harvard Medical School and Brigham and Women's Hospital have recommended that more than 30 papers from a former researcher be retracted.

Thomas Steitz, who won the 2009 chemistry Nobel Prize for his ribosome work, has died, the Washington Post reports.

In PLOS this week: mechanisms for genes implicated in coronary artery disease, rumen microbes and host genetics influence cow methane production, and more.