Chip Implants Linked to Animal Tumors

A VeriChip microchip held in pair of tweezers is displayed in Boca Raton, Fla., in this May 10, 2002, file photo. Proponents say the chips, when implanted in people, offer security and medical identification benefits. Detractors worry that abuse of the chips will eliminate personal privacy in the digital age. (AP Photo/Steve Mitchell) (Steve Mitchell - AP)

"I didn't even know VeriChip before I stepped down from the Department of Health and Human Services," he said in a telephone interview.

Also making no mention of the findings on animal tumors was a June report by the ethics committee of the American Medical Association, which touted the benefits of implantable RFID devices.

Had committee members reviewed the literature on cancer in chipped animals?

No, said Dr. Steven Stack, an AMA board member with knowledge of the committee's review.

Was the AMA aware of the studies?

No, he said.

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Published in veterinary and toxicology journals between 1996 and 2006, the studies found that lab mice and rats injected with microchips sometimes developed subcutaneous "sarcomas" _ malignant tumors, most of them encasing the implants.

_ A 1998 study in Ridgefield, Conn., of 177 mice reported cancer incidence to be slightly higher than 10 percent _ a result the researchers described as "surprising."

_ A 2006 study in France detected tumors in 4.1 percent of 1,260 microchipped mice. This was one of six studies in which the scientists did not set out to find microchip-induced cancer but noticed the growths incidentally. They were testing compounds on behalf of chemical and pharmaceutical companies; but they ruled out the compounds as the tumors' cause. Because researchers only noted the most obvious tumors, the French study said, "These incidences may therefore slightly underestimate the true occurrence" of cancer.

_ In 1997, a study in Germany found cancers in 1 percent of 4,279 chipped mice. The tumors "are clearly due to the implanted microchips," the authors wrote.

Caveats accompanied the findings. "Blind leaps from the detection of tumors to the prediction of human health risk should be avoided," one study cautioned. Also, because none of the studies had a control group of animals that did not get chips, the normal rate of tumors cannot be determined and compared to the rate with chips implanted.