Unpublished data shows breast cancer drug 'third less effective' - The Guardian 16th May 2008

Unpublished data from trials of the breast cancer drug Herceptin show that it may be up to a third less effective than has been claimed, experts will say today. Writing in the Lancet medical journal, doctors in New Zealand say they may have identified a new case of publication bias - in which drug companies publish only trial results that are favourable. Doctors from the Pharmaceutical Management Agency (Pharmac), which is the equivalent of the UK's National Institute for health and Clinical Excellence, say the missing data is important and relates to a trial involving nearly 1,000 women.

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