Mammography radiates doubts

Samuel Epstein

January 31, 1992|By Samuel Epstein

IT HAS BEEN widely (and with reason) charged that the makers and marketers of silicone breast implants, and self-interested plastic surgeons, made women their guinea pigs. But what of that other, and greater, scourge of women, breast cancer? There is reason to believe that women are equally ill-served by the cancer Establishment, especially in its unrelenting promotion of mammography.

Breast cancer now strikes one in nine women, a dramatic increase from the one in 20 in 1950. This year, 180,000 new cases and 46,000 deaths are expected. Hearings scheduled Feb. 5 in Washington by the Breast Cancer Coalition, an advocacy group loosely modeled on AIDS activists, could not seem more timely.

The coalition wants more federal funding for the National Cancer Institute to increase its research into the causes and treatment of breast cancer, and to improve delivery of breast health care -- including diagnostic screening. In pursuing these goals, the coalition has been co-opted into supporting the policies of the cancer Establishment -- NCI and the American Cancer Society -- which is fixated on basic research, diagnosis and treatment. Cancer prevention receives only an estimated 5 percent of the annual $1.8 billion NCI budget.

Breast cancer is not the only cancer on the rise. While its incidence has increased 57 percent since 1950, overall cancer has increased 44 percent, now striking one in three people and killing one in four. Male colon cancer is up 60 percent, testis, prostate and kidney cancer up 100 percent, and other cancers, such as malignant melanoma and multiple myeloma, more than 100 percent. The cancer Establishment trivializes evidence linking these increasing rates with avoidable exposure to cancer-causing industrial chemicals and radiation that permeate our environment -- food, water, air and workplace.

The cancer Establishment maintains, on tenuous evidence, that a fatty diet itself is a major cause of breast cancer, while ignoring contaminants in fat. Carcinogenic pesticides, such as the highly persistent chlordane and dieldrin, which concentrate in animal fats, are known to cause breast cancer in rodents. Elevated levels of DDT and PCBs are found in human breast cancers.

In 1977, NCI's director of endocrinology, Dr. Roy Hertz, warned, without effect, of breast cancer risks from these contaminants.

More ominous is the enthusiastic endorsement by the cancer Establishment of massive nationwide expansion of X-ray mammography, including routine, annual screening. While there is a general consensus that mammography improves early cancer detection and survival in post-menopausal women, no such benefit is demonstrable for younger women.

Furthermore, there is clear evidence that the breast, particularly in premenopausal women, is highly sensitive to radiation, with estimates of increased risk of breast cancer of up to 1 percent fTC for every rad (radiation absorbed dose) unit of X-ray exposure. This projects up to a 20 percent increased cancer risk for a woman who, in the 1970s, received 10 annual mammograms of an average two rads each. In spite of this, up to 40 percent of women over 40 have had mammograms since the mid-1960s, some annually and some with exposures of 5 to 10 rads in a single screening from older, high-dose equipment.

Significant studies on radiation risks to the breast have been well known since the late 1960s, including evidence that mammography, especially in younger women, was likely to cause more cancers than could be detected. A confidential memo by Dr. Nathaniel Berlin, a senior NCI physician in charge of large-scale mammography screening, in 1973 may explain why women were not warned of this risk: "Both the (American Cancer Society) and NCI will gain a great deal of favorable publicity (from screening, and) . . . this will assist in obtaining more research funds for basic and clinical research which is sorely needed."

Thus, once again, suspect technology was applied to women on a large scale, in spite of clear warning signals and with insufficient knowledge of the likely consequences. (On a smaller scale, but even more ethically appalling, was the use until last April of industrial polyurethane foam to coat silicone breast inserts, despite clear evidence that its manufacturing contaminants and breakdown products were carcinogenic. As with mammography, no serious studies have been launched to find out what happened to women in whom the foam was implanted, or indeed to women carrying any type of silicone implant.)

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