In their Comment article 'Raise standards for preclinical cancer research', C. Glenn Begley and Lee Ellis (Nature 483, 531–533; 2012) refer to scientists at Amgen who were able to reproduce findings in only 11% of 53 published papers. Several correspondents have asked for details of these studies, which were not provided in the article.
The Amgen scientists approached the papers' original authors to discuss findings and sometimes borrowed materials to repeat the experiments. In some cases, those authors required them to sign an agreement that they would not disclose their findings about specific papers. Begley and Ellis were therefore not free to identify the irreproducible papers — a fact that the Comment should have mentioned.
The Amgen scientists approached the papers' original authors to discuss findings and sometimes borrowed materials to repeat the experiments. In some cases, those authors required them to sign an agreement that they would not disclose their findings about specific papers. Begley and Ellis were therefore not free to identify the irreproducible papers — a fact that the Comment should have mentioned.
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