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Tumors in Long-Term Rat Studies
Associated with Microchip Animal Identification Devices.
Elcock LE, Stuart BP, Wahle BS, Hoss HE,
Crabb K, Millard DM, Mueller RE, Hastings TF, Lake SG.
Bayer Corporation, Toxicology Department,
Stilwell, Kansas 66085, USA.
laura.elcock.b@bayer.com
Tumors surrounding implanted microchip animal identification devices were noted in two separate chronic toxicity/oncogenicity studies using F344 rats. The tumors occurred at a low incidence rate (approximately 1-2 in 100), but did result in the early sacrifice of most affected animals, due to tumor size and occasional metastases. No sex-related trends were noted. All tumors occurred during the second year of the studies, were located in the subcutaneous dorsal thoracic area (the site of microchip implantation) and contained embedded microchip devices. All were mesenchymal in origin and consisted of the following types, listed in order of frequency: malignant schwannoma, fibrosarcoma, anaplastic sarcoma, and histiocytic sarcoma. The following diagnostic techniques were employed: light microscopy, scanning electron microscopy, and immunohistochemistry. The mechanism of carcinogenicity appeared to be that of foreign-body induced tumorigenesis.
From The British Small Animal Veterinary Association (BSAVA) “Microchip Report 2004”:
“Migration remains the commonest problem with the elbow and shoulder being the favourite locations of wayward microchips.” ....
“The most disastrous report received during 2004 concerned an attempt to implant a struggling kitten resulting in sudden death. During the post mortem examination the microchip was found in the brainstem.”
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