The Atlanta Journal-Constitution
Environmental link to breast cancer hunted
Grant funds daunting but critical research at Boston University.
Imagine that you are a molecular biologist who has spent the last 20 years in your lab, doggedly trying to figure out how chemicals in the environment cause human cells to become cancerous. One day a benefactor asks you what it would take to make real progress toward that goal. You say, “Maybe about $5 million over a threeyear period.” And your benefactor says, “Done!”
That’s pretty much the way it happened for David Sherr, professor of environmental health at Boston University and director of the school’s Superfund Research Program. His fairy godmother was a little-known local group called Art beCAUSE Breast Cancer Foundation, which last fall announced a $5 million grant to Sherr and four other researchers to identify the environmental causes of breast cancer and methods of preventing the disease.
Ellie Anbinder, founder and executive director of the foundation, said money for that kind of research has to come from the private sector because “the vast majority of government research monies go to treatment and cure.” But she believes chemicals in the environment play a significant, if not dominant, role in breast and other cancers. Identifying them and putting pressure on policymakers to minimize exposure to them could be the first step in preventing the disease.
Epidemiologists have been trying for decades to demonstrate links between cancer and the environment. In 2011 the Institute of Medicine, an arm of the National Academy of Sciences, convened a blue-ribbon panel that found no solid evidence, with the “possible” exception of a few workplace chemicals such as benzene.
“It’s a radioactive topic,” said an official of the National Cancer Institute who asked not to be identified. “Many people feel strongly that chemicals in the environment are causing breast cancer. But we couldn’t find any patterns.”
Art beCAUSE (so named because the co-founder owned an art gallery, and one of the first projects saw artists donating a percentage of sales to research) has only $350,000 of the promised $5 million. “We’ll give it to them as we raise it,” said board chairman Bill Diercks.
Sherr said the first installment is enough for each of the five labs to hire a dedicated researcher for a year. “It’s a start,” he said. “The critical element was to get everyone working together, which gives you a synergistic effect. We can share technology and resources and refine our ideas.”
Sherr is working on a protein known as the aryl hydrocarbon receptor, which binds to environmental carcinogens and begins the aberrant signaling that causes cells to divide out of control. Two others members of the consortium — Dr. David Seldin, chief of hematology/ oncology at Boston University, and Gail Sonenshein, professor of biochemistry at Tufts University School of Medicine in Boston — also are cell-signal researchers. The remaining members of the consortium are Charlotte Kuperwasser, an expert on the biology of cancer stem cells at Tufts, and Stefano Monti, a computational biologist at B.U.
Monti’s project is to develop a high-tech genomic platform that can screen large numbers of chemicals quickly and economically for their ability to affect cancer-related signaling pathways in human cells. The consortium believes highthroughput screening may be the only practical way to find out whether the more than 80,000 untested chemicals on the market today cause cancer.
The gold-standard test of carcinogenicity, the two-year rodent bioassay, uses 800 animals and costs $2 million to $4 million per compound. No wonder only about 1,500 chemicals have been tested so far. But most epidemiological studies have failed to identify environmental culprits, which Sherr says is not surprising.
“The critical exposures that result in breast cancer may have happened 10 or 20 years before diagnosis, in utero, or even a generation or two generations ago,” Sherr said. “There is no realistic way for an epidemiologist to quantify exposure to any one chemical over that time frame, let alone the tens of thousands of chemicals and combinations thereof. It’s simply impossible with current technologies.”