Pediatric clinical trials: damned if you do, damned if you don’t
Drug regulators are in a quandary. On the one hand, they’d rather spare children from being used as test subjects in clinical trials. On the other hand, recent developments show an urgent need for pediatric testing.
There have been recent reports of adverse side effects, some of them fatal, attributed to OTC drugs for children. These concerned seemingly innocuous cough and cold medications containing active ingredients such as pseudoephedrine, paracetamol [1,2], and camphor [3]. But prescription drugs for children`s ailments such as asthma and ADHD are incriminated as well.
This brought to light how very little we actually know about pediatric pharmacology.
The problem lies with the fact that many drugs with well-established efficacy and safety profile have only been tested in adults. With an aging population and low birth rates in developed countries, the pediatric drug market is not really top priority for pharmaceutical industries. Very little money is allocated for pediatric R&D. Pharmacological results were simply extrapolated to pediatric population as “miniature adults.”
The issue is compounded by lack of test subjects. Very few parents in developed countries would ever consent that their children be enrolled in a clinical trial. Most pharmaceutical companies turn to developing countries for testing. Although there are strict guidelines regulating pediatric testing, there are still concerns about adherence to GCP in those countries.
The regulators are now scrambling to come up with solutions to plug this knowledge gap on pediatric drugs.
Last year, the US passed the Best Pharmaceuticals for Children Act 2007 and an amended version (2007) of the 2003 Pediatric Research Equity Act. The Acts empowered the US FDA to require drug companies to test new drugs on children before approval [4]. However, there is still a lack of knowledge on drugs approved before 2003.
In Europe, the EMEA is requiring a pediatric investigation plan for all new drug applications starting July 2008 (unless a non-pediatric use waiver is justified). In addition, it is funding research on off-patent drugs as well as looking into pediatric clinical data that may not have been previously published [5, 6].
In the meantime, millions of children need medications while drugs against cancer, infections, asthma, high blood pressure and hyperactivity currently available are waiting to be tested for pediatric use. Do we use these drugs or not ? Quandary for doctors and parents as well.
Damned if you do. Damned if you don’t.
References:
1. Wingert WE, Mundy LA, Collins GL, Chmara ES. Possible role of pseudoephedrine and other over-the-counter cold medications in the deaths of very young children. J Forensic Sci. 2007 Mar;52(2):487-90.
2. Centers for Disease Control and Prevention (CDC). Infant deaths associated with cough and cold medications–two states, 2005. Morb Mortal Wkly Rep. 2007 Jan 12;56(1):1-4.
3. Press Release, NYC Department of Health. January 17, 2008. Health department warns parents to keep camphor products away from children.
4. US FDA, Pediatric Drug Development. Retrieved 27 Jan 2008.
5. Sinha G.J. EU law mandates drug testing in children. J. Natl Cancer Inst. 2008 Jan 16;100(2):84-5.
6. EMEA Press Release Paediatric Committee (PDCO), 25 Jan 2008.
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