Navigation Links
Some drug studies more likely to have favorable conclusions

Previous work has shown that, when a drug study was funded by the company that made that drug, the results might be biased in favour of that drug because the methods or analyses were manipulated.

New research published on today shows that, for blood pressure drugs, studies are now much less likely to have biased results but still tend to have overly positive conclusions favouring the company's products.

The authors call on editors and peer reviewers to scrutinise the conclusions of these studies to ensure that they contain an unbiased interpretation of the results.

Meta-analyses represent the highest level of research evidence in the hierarchy of study types. They pool data from multiple studies to provide summary statistics on the effectiveness of a given treatment. They have a great deal of influence on patient care and healthcare policy and drug companies have started to reference meta-analyses in their advertisements.

Previous studies have shown that randomised controlled trials with financial ties to single drug companies are more likely to have results and conclusions that favour the sponsors products, and a recent study suggests that the same holds true for meta-analyses.

So researchers in the US set out to determine whether financial ties with single drug companies are associated with favourable results or conclusions in meta-analyses on blood pressure lowering (antihypertensive) therapies.

A total of 124 meta-analyses were included in the study, 49 (40%) of which had single drug company financial ties. Differences in study design and quality were measured.

Meta-analyses with single drug company financial ties were not associated with favourable results but were significantly more likely to have favourable conclusions, even when differences in study quality were taken into account.

In fact, the data show that studies funded by a single drug company have a 55% rate of favourable results that is transformed into a 92% rate for favourable conclusions, representing a 37% gap. The gap shrinks to 21% (57% to 79%) when two or more drug companies provide support. Yet the gap vanishes entirely for studies done by non-profit institutions alone or even in conjunction with drug companies.

These findings suggest a disconnect between the data that underlie the results and the interpretation or spin of these data that constitutes the conclusions, say the authors.

The findings also expose a failure of peer review, add the authors, and should act as a wake-up call to editors and peer reviewers, as well as to policy-makers, meta-analysts, and readers. All of these groups should closely scrutinise the conclusions of meta-analyses to ensure that they contain an unbiased interpretation of results, they conclude.

The clear inference from this study is that impartial studies are more reliable, say researchers in an accompanying editorial. However, rather than imposing legal restrictions on drug company funding or participation in these studies, they suggest that doctors should be warned to be cautious in interpreting the conclusions of studies.


Contact: Emma Dickinson
BMJ-British Medical Journal

Related medicine news :

1. Gene Studies of Male-Female Differences Often Flawed
2. Two studies published in the Lancet
3. Study of Studies Finds No Risk to Children From Phthalates in Toys
4. Just Completed Studies Reveal Impact of New Medicare Reimbursement Regulations
5. Studies Prove Exercise Can Heal the Body Mind and Soul
6. Studies Shed New Light on Breast Cancer, Treatment
7. Multi-Year Compendium of Pharmaceutical Case Studies Available from Best Practices, LLC
8. Genomic Health Announces Multiple Studies on Oncotype DX(TM) Presented at 2007 American Society of Clinical Oncology (ASCO) Breast Cancer Symposium
9. Best Practice Database: Complimentary Excerpt of Three Sales Force Excellence Studies
10. Major Pharma Clinical Case Studies From Amgen, AstraZeneca, GSK, Intermune, Cephalon Inc, Sunesis Pharmaceuticals and Dartmouth Medical School During Fall Clinical Focused Programs
11. NIH awards Einstein multimillion dollar grant to extend studies of exceptional longevity
Post Your Comments:
(Date:10/13/2015)... ... 2015 , ... Sir Grout of Greater Boston donated an expansive, seven room ... McDonald House Charities® (RMHC®). This donation was made in an effort to give back ... its inception. , “We believe strongly in the Ronald McDonald House Charities, and they ...
(Date:10/13/2015)... Diego, CA (PRWEB) , ... October 13, 2015 ... ... launch of its newest technology platform, ENGAGE, at HIMSS’s Patient Engagement Summit ... to end. , ENGAGE delivers innovative health programs and interventions via mobile devices ...
(Date:10/13/2015)... ... 2015 , ... Element Blue ™, a leading IT ... RightSensor™ LLC, an Internet of Things (IoT) hardware supplier that delivers custom and ... for customers requiring sensor hardware for critical data environments. , RightSensor™, working with ...
(Date:10/13/2015)... ... October 13, 2015 , ... NavaFit Inc. today announced the launch of its ... with, participate in local fitness & sporting events, and stay motivated. Users ... medical costs drive us to get more serious about fitness and wellness, individuals are ...
(Date:10/13/2015)... (PRWEB) , ... October 13, ... ... Postnatal Omega-3, a first-of-its kind product that targets the unique health needs ... Omega-3” of the American Pregnancy Association ( ), utilizes Nordic Naturals’ ...
Breaking Medicine News(10 mins):
(Date:10/13/2015)... , Oct. 13, 2015  Mylan N.V. (Nasdaq: ... 5:00 p.m. ET host a conference call and webcast to ... plc (NYSE: PRGO ; TASE) shareholders through Mylan,s offer ... Mylan,s Executive Chairman Robert J. Coury , CEO ... --> --> Mylan will ...
(Date:10/13/2015)... -- Synapse Biomedical Inc. ( ) reported today that ... use of the NeuRx ® Diaphragm Pacing System ... the United States and patient ... PAS study group met their initial enrollment goal ahead ... expanded the enrollment target to 150 participants.   ...
(Date:10/13/2015)... COLLEGE PARK, Md. , Oct. 13, 2015 ... hubs is the biggest key to growing Baltimore ... to a report released today by the Maryland Technology ... already has many of the pieces in place to support ... Martha Connolly , director of Mtech Baltimore. "This study is ...
Breaking Medicine Technology: