Navigation Links
Some drug studies more likely to have favorable conclusions
Date:11/16/2007

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 bmj.com 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
edickinson@bmj.com
44-020-738-36529
BMJ-British Medical Journal
Source:Eurekalert

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:
*Name:
*Comment:
*Email:
(Date:2/17/2017)... ... February 17, 2017 , ... ... Prevent a Warning Letter, **An FDAnews Webinar**, Feb. 23, 2017 — 1:30 p.m. ... distinguish between corrective action (CA) and preventive action (PA)? , The methods share ...
(Date:2/17/2017)... Tx (PRWEB) , ... February 17, 2017 , ... ... revenue cycle management services, announced today that Karen Pilley has been promoted to ... is critical in today’s shifting healthcare paradigm – a shift that demands the ...
(Date:2/17/2017)... GA (PRWEB) , ... February 17, 2017 , ... Like ... to reduce readmissions. Driven in large part by the Hospital Readmission Reduction Program (HRRP), ... been a key focus area for hospitals across the nation. While many providers are ...
(Date:2/16/2017)... York, New York (PRWEB) , ... February 17, ... ... work and determination. After what took over 10 years of research, development and ... technology, NTX Technology™. NTX Technology™ is a patented compound of FDA approved ingredients ...
(Date:2/16/2017)... ... February 16, 2017 , ... As a reflection ... patient care, NWH has achieved Magnet® recognition for the second time, ... 2017. The American Nurses Credentialing Center’s Magnet Recognition Program® distinguishes organizations that meet ...
Breaking Medicine News(10 mins):
(Date:2/16/2017)... Feb. 16, 2017 Research and Markets ... Emerging Medical Device Technologies" report to their offering. ... Traditional ... procedures, general instruments, non-drug coated implantables, large endoscopes, needle based ... use over the last two to three decades for the ...
(Date:2/16/2017)... Ontario , Feb. 16, 2017  Aralez Pharmaceuticals ... global specialty pharmaceutical company, today announced that executive management ... Conference to be held February 22-23, 2017. Adrian ... of the Company at 1:35 p.m. local time on ... and audio archive for the event may be accessed ...
(Date:2/16/2017)... , Feb. 16, 2017  AcelRx Pharmaceuticals, ... pharmaceutical company focused on the development and commercialization ... acute pain, announced that Vincent J. Angotti ... a member of the company,s board of directors, ... over two decades of experience leading executive and ...
Breaking Medicine Technology: