Editors on leading medical journals have co-produced research claiming that rivals have been publishing drug trials that may be little more than marketing by pharmaceutical firms.

The editor in chief of the British Medical Journal (BMJ) and a former editor of PLOS Medicine are co-authors of a new paper that argues that a substantial minority of papers in The Lancet and The New England Journal of Medicine (NEJM) are suspected ¡°marketing trials¡± designed to promote a new drug.

Six members of the study team looked at 194 drug trials published in five medical journals in 2011, and independently assessed whether they thought they might have been designed for marketing purposes. Where four or more agreed, the trial was categorised as suspected marketing.

More than a fifth of the trials (41 in total) were assessed as suspected marketing, and all but two of these came from The Lancet and The New England Journal of Medicine.

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At the former, almost a third of trials were thought to be marketing, and 23 per cent at the latter. A further 7 per cent of all trials were considered possible, but not definite, marketing.

All the suspected marketing studies were funded by the drug manufacturer, the analysis found. In the vast majority of cases the company was involved in the study design and the reporting of results, and in the majority of cases also had control over data analysis.

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In addition, the suspected marketing studies tested drugs on patients from an average of 171 different geographical areas, compared with 13 for the trials deemed not to be marketing, according to ¡°Characterisation of trials where marketing purposes have been influential in study design: a descriptive study¡±, in Trials, a?BioMed Central journal.?

Fiona Godlee, editor in chief of The BMJ?and co-author of the paper, said that this might be because manufacturers wanted to expose as many doctors to their drugs as possible, in the hope that they would continue prescribing them even after the trial had ended.

¡°There seems no logical reason why [the trials] would need to be so multi-centred,¡± she said.

The study did look at 15 drug trials published in The?BMJ, but concluded that none of them was marketing. They came to the same conclusion about four papers from PLOS Medicine. Another co-author on the paper, Virginia Barbour, chair of the Committee on Publication Ethics, was an editor at PLOS Medicine during the period studied. She pointed out that neither she nor Dr Godlee assessed papers in their own journals.

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Asked whether the paper was a swipe by?The BMJ at rivals, Dr Godlee said that ¡°people will say that and perhaps with some justification, but we did look at all the journals¡±. It may have been better to have asked other journal editors to be co-authors as well, she acknowledged.

On the findings, she argued that ¡°we didn¡¯t know what we would find¡±. As the results become clear, ¡°it was looking slightly awkward as it was looking like a whitewash¡±, as no BMJ paper was found to be marketing. ?

An?NEJM spokeswoman said that ¡°all of the studies we published underwent rigorous internal and external peer view, and answered an important and valid clinical question¡±. A spokeswoman for The Lancet declined to comment.?

david.matthews@tesglobal.com