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KILLING OFF THE BABY BOOM GENERATION

Alicia Ault | 13.07.2002 03:49

An entire generation faces extermination from the polio vaccine that was administered in the mass inoculation programs of the 50s and 60s. The vaccine was made from monkey kidneys and was infected with Simian Virus 40 - SV40 - that is a potent cancer causing agent. And SV40 became firmly established in those who received the inoculations.

Monkey Virus in Humans May Trigger Cancer: Experts
Fri Jul 12,10:24 AM ET
By Alicia Ault

WASHINGTON (Reuters Health) - Though there is still no clear consensus, a majority of researchers told a quasi-governmental health panel Thursday that simian virus 40 (SV40) has become established in humans, and that it plays a role in causing cancer, including in people who had virus-contaminated polio ( news - web sites) vaccines in the 1950s and 1960s.

The experts addressed the Institute of Medicine ( news - web sites)'s (IOM) Immunization Safety Committee, which met to hear the latest epidemiologic and lab data on SV40. In 2 to 3 months, the committee will issue a report, along with recommendations based on their assessment of the data.

SV40's role in cancer has been debated since the early 1960s, when it was discovered that inactivated polio vaccine contained the naturally occurring monkey virus. Monkey kidney cells were fingered as the source; they were used to grow polio for the shot. In 1961, scientists discovered SV40 caused cancer in rodents. The government required all future polio vaccine to be SV40-free.

Even so, some contaminated vaccine still on shelves may have been used, and as many as 98 million children had already been exposed during the government's Mass Immunization Program from 1955 until early 1963.

Several attorneys alleged that the three polio vaccine makers--Wyeth, Lederle and Pfizer--knowingly distributed contaminated products before 1961 and later. Stan Kops, an attorney who successfully sued those companies for causing polio in vaccinees, alleged at the meeting that Lederle continued to sell SV40-tainted oral polio vaccine until 1999.

Attorney Donald MacLachlan, representing five families who claim the vaccine caused cancer, told Reuters Health that a federal judge in Los Angeles recently allowed a case against Wyeth to proceed.

Scientists have tried to unravel whether SV40 is prevalent in humans, and if the polio vaccine caused infection, or if SV40 had been in humans previously. In the 1970s, SV40 was isolated in human tumors, especially brain and bone cancers, and, more recently, in mesotheliomas, a rare lung cancer found mostly in people over age 50, and primarily in men with occupational exposure to asbestos.

Michele Carbone of Loyola University in Chicago, Illinois has linked SV40 to mesothelioma. He called SV40 a "potent human carcinogen," capable of transforming cells and inhibiting the p53 gene that normally keeps cancer cells in check. But he added that the virus is not likely to act alone, and that co-factors--like asbestos--lead to cancer.

In 2002, several researchers found SV40 in non-Hodgkin's lymphoma (NHL). Janet Butel, a Baylor College of Medicine virologist, isolated SV40 in NHL and has sequenced SV40 genomes. In three NHL samples, the SV40 strain was the same as one found in samples of a polio vaccine used in the 1950s, she said. SV40 "seems to be established in humans," and "it is causing infection," said Butel.

"Perhaps it was there before the polio vaccine, I don't know," she said, adding that widespread vaccine use may have broadly distributed SV40 in humans. The virus has been found in many nations.

Erik Engels of the National Cancer Institute ( news - web sites) is conducting a study in northern India, where monkeys and humans live in close proximity, to see if--and how--SV40 might be jumping species or being transmitted from human-to-human.

Another researcher, Jeffrey Kopp of the National Institute of Diabetic, Digestive and Kidney Diseases, said a small study he and colleagues recently completed found SV40 in blood and urine of both healthy people and kidney disease patients, and that "argues for relatively common infection in the general population." Kopp's study will be published in September's Journal of the American Society of Nephrology.

There were several nay-sayers, including long-time SV40 researcher Keerti Shah of Johns Hopkins University Bloomberg School of Public Health. Shah has been unable to isolate SV40 in human urine, and said that lab studies have been so inconsistent that they do not prove causality.

Howard Strickler, an epidemiologist at the Albert Einstein College of Medicine in New York, presented several studies he has conducted, all showing no association between SV40 and cancer incidence, he said.

In a 1998 study in The Journal of the American Medical Association ( news - web sites), Strickler and colleagues found no link between SV40 exposure and a type of cancer called ependymoma. Strickler also analyzed mesothelioma rates and said that incidence has remained at a steady 3% a year. It is very rare and not rising in women, said Strickler, which he said argued against the possibility that the cancer is being driven by polio vaccine exposure.

Also, rates have only increased among people over 50, who were least likely to have been vaccinated, he said.

That was disputed by Carbone, who said a large number of people aged 20 to 45 were vaccinated in the 1960s, and that age group is having more mesothelioma.

Susan Fisher, chief of the division of epidemiology at the University of Rochester, conducted a cohort study, comparing people born between 1955-1959 who were likely exposed to vaccine to those born between 1961-1965, and documented cancer incidence in that group from 1973 to 1993.

In the vaccine-exposed group, there was a 178% increase in mesothelioma, and an increased incidence of ependymoma and osteosarcoma. But, because the cancers are rare, the differences between the exposed and unexposed group were not statistically significant, said Fisher.

 http://story.news.yahoo.com/news?tmpl=story&u=/nm/20020712/hl_nm/cancer_virus_dc_1

Alicia Ault
- Homepage: http://story.news.yahoo.com/news?tmpl=story&u=/nm/20020712/hl_nm/cancer_virus_dc_1

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