Treating Autism as if Vaccines Caused It
The theory may be dead, but the treatments live on.
Also in Slate: Sydney Spiesel explains why parents believe in autism cures that don't work.
A federal court may have changed the public discourse about the safety of vaccines in February, when it dismissed the theory that they cause autism. But vaccine damage is still the reigning paradigm for a rump caucus of thousands of parents who turn to physicians with a remarkable set of beliefs and practices in hope of finding recourse for their children's ills.
To sift through the 15,000-page record of the Autism Omnibus hearings and the decisions by the three special masters who considered the evidence is to peek into a medical universe where autism is considered a disease of environmental toxicity, rather than an inherited disorder, and where doctors expose children to hundreds of tests simply to justify the decision to "detoxify" them. In some cases, the judges found, doctors simply ignored data that didn't fit the diagnosis.
The court came down hard on the alternative medical practitioners who tailor their treatments to fit theories of vaccine damage. Among the doctors criticized was Jeff Bradstreet, a former Christian preacher in Melbourne, Fla., who has treated 4,000 children with neurological disorders. Among the children was Colten Snyder, whose case was one of those considered by the court.
Chelation therapy—the administration of chemical agents that tightly bind heavy metals and can be used to flush them out of the body—became a craze in the 1980s as a treatment for atherosclerosis in adults; proponents claimed patients were being harmed by mercury from their fillings. Dentists used it as an excuse to pull teeth and even remove jaw bones from their patients. Boyd Haley, a University of Kentucky chemist, was the high priest of the amalgam wars. When the thimerosal theory emerged on the scene, Haley and other chelationists shifted their focus to autistic children.
From 2000-06, Bradstreet prescribed seven rounds of chelation for Colten, each consisting of 90 doses over a four-month period, mostly in pill form. Bradstreet theorized that thimerosal, a mercury-containing preservative previously used in three infant vaccines, caused Colten's symptoms. Remove the mercury, cure the autism, went his theory.
Colten, now 12 years old, hated chelation, which can be painful and, on rare occasions, fatal. On Aug. 20, 2000, a nurse reported that he "went berserk" after receiving the chelating agent. On other occasions he screamed all night, vomited, and suffered constipation, back pain, headaches, night sweats, and "meltdowns."
Of course, children generally don't like medicine, especially when it's administered intravenously, as was the case with Colten's final rounds of chelation. But Special Master Denise Vowell found Colten's suffering particularly egregious, because the boy had never shown any evidence of mercury toxicity.
"The medical records ... reflected that Colten did poorly after every round of chelation therapy," Vowell wrote in her opinion. "The more disturbing question is why chelation was performed at all, in view of the normal levels of mercury found in the hair, blood and urine, its apparent lack of efficacy in treating Colten's symptoms, and the adverse side effects it apparently caused."
The answer can be traced, in part, to a Chicago laboratory that performs most of the chemical testing for alternative doctors like Bradstreet who treat autistics. Doctor's Data Inc., which tests about 100,000 urine samples for toxic metals each year, presents the results in such a way that it almost guarantees a finding of "toxicity" for each child.
According to a recent federal report on complementary medicine, about 72,000 children were chelated in 2007. Most of them were probably seen by doctors loosely allied to an organization called Defeat Autism Now! The doctors, naturopaths, and other practitioners in DAN! frequently order up exhausting regimens of testing for each child in the belief that people with autism are out of whack with nature. They test the children for viruses, bacteria, yeast, immune system elements, and brain antibodies, drawing copious amounts of blood, as well as spinal fluids and biopsy material, before prescribing immune globulins, vitamins, enzymes, and other pills and infusions. The tests and therapies run into the tens of thousands of dollars per child.
One of the more popular tests, in recent years, has been for traces of toxic metals. The testing methodology is explained here. In a nutshell, Doctor's Data classifies the level of mercury in the urine of a recently chelated child by comparing it with base-line levels in normal, unchelated children. Naturally, the chelated levels are higher. That's what chelators do: They leach metals out of tissue. Plus, everyone has a little bit of mercury in them, because trace amounts are in our air, water, and food. What's remarkable is that so many people have relied on the data from these tests.
In July 2000, in preparation for heavy-metals testing, Colten was administered 100 milligrams of the chelating agent DMSA. When Doctor's Data tested his urine, it found 2.2 micrograms of mercury per liter. Even though 2.2 micrograms is about what you'd find in the urine of a normal, nonchelated person, Doctor's Data reported the result as "very elevated." And although conventionally trained pediatricians are instructed not to use chelation even for acute lead poisoning—unless the level is above 70 micrograms per liter of urine—Bradstreet, who is not trained in pediatrics or neurology, decided to chelate Colten, as he does with about one-third of his patients.
Among the parents and physicians of Defeat Autism Now!, it is an article of faith that these children are genetically vulnerable to damage from "toxins" like thimerosal. There's little scientific evidence to support that belief. Indeed, Vowell found "no reliable evidence" of hypersusceptibility to mercury in children with autism diagnoses.
But many parents remain convinced that chelation helped. "I think we're in a strange world when judges are opining on treatments for autism," said J.B. Handley, co-founder of Generation Rescue, a group that attributes many cases of autism to vaccines. "We hear more reports from parents than ever that chelation is working." In an e-mail message, Handley hypothesized that even if thimerosal were not solely to blame for autism, chelation still had beneficial effects. "We don't have answers for everything, and more kids are recovering."
To me, the Doctor's Data tests look like an artifact of science being put to unscientific use. A parent in search of answers on how to improve the health and communication skills of a profoundly disabled child isn't likely to focus on the finer points of matched controls. "Someone waves this sheet in front of you and says, 'You're three times the background rate!' " says Dr. Robert Baratz, a cell biologist and internist in Braintree, Mass., who has testified on chelation before medical boards. "Their agenda is to make money off of somebody else's misfortune. When you look at their charts, they never cure any patients. It's merely a matter of how close you can get to the bottom of their wallet."
Then comes the bully pulpit, the advocacy groups, doctors, and supplement salesmen who claim that chelation cures children. They overlook the fact that most kids' behavior will change as they grow older, whether or not they are autistic. To attribute these changes to an implausible treatment, without a controlled study, is wishful thinking.
Science hasn't figured out how to deal with autism, because the neural changes that probably cause it occur in the womb and it's a condition defined by behavior, not biological markers. In the absence of satisfactory answers, good money chases bad.
Doctor's Data did not respond to a request for an interview. An individual close to the company said there was no way to establish a base line for post-chelation samples, which might have been provoked by any number of different chelating agents, at varying doses. "The tests are ordered by physicians, so they can interpret the results," this person said. "They do what they want with this information." But copies of the reports, which chart the child's mercury levels into deceptively shaded "elevated" and "very elevated" areas, are typically provided to both physicians and patients.
Bradstreet eventually realized that chelation wasn't working for Colten. After conducting a painful spinal tap and a gut biopsy, he concluded that Colten was suffering not so much from thimerosal as from the effects of the measles-mumps-rubella shot, which contains no mercury. He began administering regular intravenous immune globulin, conventionally given to immunocompromised patients. The family said Colten improved on this therapy—at $3,000 a pop, though, they often couldn't afford it.