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Microchip Safety and Efficacy Microchip Transponders and Cancer – "Is there any evidence that tumours form at the site of transponder implantation in companion animals?"
Rumours and media reports from various countries have recently hinted that implanting transponders into companion animals may predispose them to tumour development at the site of implantation.
The WSAVA Microchip Committee has reviewed the available evidence and come to the conclusion that from the tiny number of such cases reported compared to the huge numbers of animals that have been implanted this effect is extremely small, if it exists at all. The benefits of transponder implantation, backed up with a reliable, accurate and available database, far outweigh this risk. Further details and the WSAVA Microchip Committee position is provided below.
A Request for Information
However, in order to monitor the situation the Committee would be interested to receive details of any cases were tumours have developed in companion animals at the site of transponder implantation and where there is suspicion of an association. In the first instance details should be sent to the WSAVA secretariat at
[email protected].
WSAVA Microchip Committee Position on Microchips and Cancer
Reports of concerns about a possible link between the implantation of RFID transponders and the formation of tumours have been brought to the attention of the WSAVA Microchip Committee.
1) Although these reports refer to scientific studies conducted in the 1990’s no scientific reference is made to allow us to check the original papers
2) The Committee is aware of more recent scientific papers which have reported tumour formation at the site of implanted transponders in mice. The mice involved in these studies were either inbred strains or strains that have been genetically modified to predispose individual animals to cancer formation.
3) Many studies show that it is dangerous to transpose results from experiments in one species to other species, eg from genetically modified mice to normal pet dogs and cats.
4) Transponder safety has been reviewed by many national regulatory authorities responsible for the approval of implantable medical devises. These authorities have approved transponders as safe and effective ways of permanently identifying animals. Such approval would not have been granted if there had been significant evidence that implanting transponders induce tumour formation in the domestic animals concerned.
5) Many millions of companion animals have subsequently been implanted around the world with a tiny proportion reporting any type of problem. In the UK where there has been an informal reporting system for adverse reactions for over ten years only two of the 3.7 million implanted animals recorded on the Petlog database have been reported as developing a tumour at the site of implantation. In one of these cases the pathologist reported that the transponder was incidental to the tumour formation. Overall, the Committee is aware of less than ten reports of tumours forming in companion animals associated with an implanted microchip.
6) Millions of animals have carried their transponders for most of a natural life time without any adverse effects.
7) Conversely many thousands of implanted animals have been reunited with their owners after going missing by tracing the owner through a reliable database.
Conclusion
While it is not possible to claim that the reaction to an implanted transponder in a companion animal will NEVER induce tumour formation, the Committee is unanimously of the opinion that the benefits available to implanted animals far outweigh any possible risk to the health of the animal concerned.
From Dr. Linda Lord, an RFID researcher at Ohio State University
in the USA
There is no evidence to suggest that companion animals implanted with a microchip are at a higher risk for developing a tumor. The mice used in the studies where an association between a microchip and development of a tumor occurred were genetically predisposed to cancer and do not represent the genetic diversity we see in our dogs and cats. In the United Kingdom where over half of the dog population has a microchip, the British Small Animal Veterinary Association has established a formal system for the reporting of adverse events related to microchips, including tumors. In ten years of collecting data, only 2 tumors were reported to their adverse event registry. When you weigh this extremely rare event against the thousands of pets that are reunited worldwide each year from a microchip, it seems obvious that the benefits from microchipping far outweigh any small risk from a tumor. All of my pets are microchipped and all my future pets will be as well. I don't every worry about cancer from a microchip, I worry about my pets getting lost and finding them.
πηγη:
http://www.webcitation.org/5akEi2cVL