This 2014 study found that unconventional and groundbreaking research was routinely rejected by medical journals:

“Our research suggests that evaluative strategies that increase the mean quality of published science may also increase the risk of rejecting unconventional or outstanding work.”

The study was also a collateral indication of the degree to which peer reviewers didn’t try to advance science.

http://www.pnas.org/content/112/2/360.full “Measuring the effectiveness of scientific gatekeeping”

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