Around half of all clinical trials have not been published; some trials have not even been registered. If action is not taken urgently, information on what was done and what was found in trials could be lost forever, leading to bad treatment decisions, missed opportunities for good medicine, and trials being repeated unnecessarily.

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More information on the AllTrials campaign

This is an 8 page briefing note on missing trials, prepared by Dr Ben Goldacre with Dr Carl Heneghan (CEBM), Dr Fiona Godlee (BMJ), and Sir Iain Chalmers (JLI): Missing trials briefing note

Professor Peter G√łtzsche of the Nordic Cochrane Centre wrote in the BMJ on Deficiencies in proposed new EU regulation of clinical trials.