Mesothelioma and Asbestos

Asbestos is Leading Risk Factor for

The main risk factor for developing is exposure to asbestos. Asbestos refers to a family of fibrous minerals made of silicate. Asbestos was once used in many products such as insulation, floor tiles, door gaskets, soundproofing, roofing, patching compounds, fireproof gloves and ironing board covers, and even brake pads. As the link between asbestos and has become well known, the use of this material has almost stopped. Most use stopped after 1989, but it is still used in some products. Experts have linked this drop in asbestos use to the fact that the rate of development of is no longer increasing [in the U.S.]. Still, up to 8 million Americans may already have been exposed to asbestos. Exposure to asbestos particles suspended in air and building materials is much less hazardous except when they are being removed. Since asbestos is a naturally occurring mineral, it can also be found in dust and rocks in certain parts of the United States as well as the world. According to the U.S. Environmental Protection Agency, as many as 733,000 schools and public buildings in the country today contain asbestos insulation. As many as 10% to 15% of schools in the United States may contain asbestos insulation. People who may be at risk for occupational asbestos exposure include some miners, factory workers, insulation manufacturers, railroad workers, ship builders, gas mask manufacturers, and construction workers, particularly those involved with installing insulation. Several studies have shown that family members of people exposed to asbestos at work have an increased risk of developing , because asbestos fibers are carried home on the clothes of the workers. The incidence rate for in men is dropping, probably because they are no longer being exposed directly to asbestos in their work. But the incidence rate for in women is steady, which suggests that they are being exposed in a way that is not directly tied to work, but more to their environment either at home or work. One example would be asbestos in buildings where they work or live. A study from California also links to naturally occurring asbestos deposits in mountains. Another important point about asbestos and is that the risk of does not drop with time after exposure to asbestos. The risk appears to be lifelong and undiminished. There are 2 main forms of asbestos — serpentine and amphiboles.

Serpentine fibers are curly and pliable. Chrysotile is the only type of serpentine fiber and it is the most widely used form of asbestos.

Amphiboles are thin, rod-like fibers. There are 5 main types — crocidolite, amosite, anthrophylite, tremolite, and actinolyte. Amphiboles (particularly crocidolite) are considered to be the most carcinogenic (cancer-causing). However, even the more commonly used chrysotile fibers are associated with malignant (cancerous) mesotheliomas and should be considered dangerous as well. When asbestos fibers are inhaled, most are cleared in the nose, throat, trachea (windpipe), or bronchi (large breathing tubes of the lungs). Fibers are cleared by sticking to mucus inside the air passages and being coughed up or swallowed. The long, thin, fibers are less readily cleared, and they may reach the ends of the small airways and penetrate into the pleural lining of the lung and chest wall. These fibers may then directly injure mesothelial cells of the pleura, and eventually cause . Asbestos fibers can also damage cells of the lung and result in asbestosis (formation of scar tissue in the lung), and/or lung cancer. The risk of lung cancer among people exposed to asbestos is increased by 7 times, compared with the general population. Indeed, asbestosis, , and lung cancer are the 3 most frequent causes of death and disease among people with heavy asbestos exposure. Peritoneal , which forms in the abdomen, may result from coughing up and swallowing inhaled asbestos fibers. Cancers of the larynx, pancreas, esophagus, colon, and kidney may also come from asbestos exposure, but the increased risk is small. The risk of developing a is related to how much asbestos a person was exposed to and how long this exposure lasted. People exposed at an early age, for a long period of time, and at higher levels are most likely to develop this cancer. Mesotheliomas take a long time to develop. The time between first exposure to asbestos and diagnosis of is usually between 20 and 50 years. 

Asbestos Information

Asbestos and asbestos containing materials are responsible for causing asbestos cancer and asbestos disease cases around the world. Two of the most dangerous forms of asbestos disease are and asbestosis. Asbestos has been used in thousands of products for more than a century because it is highly versatile, abundant, and relatively cheap. Since asbestos is a naturally occurring mineral, it requires no manufacturing. Instead, asbestos only has to be mined, crushed, and added into products during the manufacturing process. Since asbestos is basically a rock, it is highly impervious to heat. It also happens to be chemically inert. Since its basic mineral structure is shaped in long, thin fibers, it can be broken down into these fibers to add strength and flexibility to nearly any product. A characteristic of asbestos is what is known as tensile strength. It allows products to be flexible yet strong while not adding excessive weight. Asbestos is one of few minerals that can actually be woven. Asbestos was commonly woven into materials that made excellent insulators, but were too brittle to be used by alone because they would crumble. Asbestos made insulation products flexible and durable since it was not affected by heat. Asbestos is not a very effective insulator by itself. All these qualities add up to a very useful and inexpensive product but some of them also make asbestos toxic to those that inhale asbestos fibers. There are six forms of asbestos characterized by differences in structure and color. Asbestos is also divided into two categories: serpentine and amphibole asbestos. Serpentine asbestos is made of curly fibers and amphibole asbestos is made of long, straight fibers. Both types of asbestos are considered dangerous, though it is thought amphibole asbestos forms, including crocidolite and amosite, may be more dangerous to humans. 

Asbestos Exposure

Unfortunately, there are many opportunities for asbestos exposure since asbestos was used so abundantly in both industrial and consumer products. Most people that develop asbestos cancer and other asbestos diseases, including and asbestosis, usually have a history of chronic exposure to asbestos. is somewhat unique in this respect, as cases have developed in people with limited asbestos exposure. As a result, there is no established “safe” level of asbestos exposure. Workers are exposed to asbestos when the substance or products containing asbestos are cut, crushed, sanded, drilled or otherwise disturbed. When left undisturbed, asbestos-containing materials can be relatively safe. In cases where asbestos materials are mined, installed, removed, demolished, or serviced, exposure can be a risk unless strict asbestos abatement techniques are employed. When inhaled, microscopic asbestos fibers can make it past the body’s natural defenses and deep into the lungs causing asbestos disease. Once within the lungs, the fibers can irritate lung tissue leading to asbestos cancer. If asbestos fibers make their way to the alveoli or air sacs in the lungs where oxygen and carbon dioxide exchange takes place, they can cause irritation and scarring called asbestosis. Asbestos fibers that pass through the alveoli and into the pleural mesothelium, can eventually lead to asbestos cancer in the form of tumors and malignant . 

Asbestos Products

The following is a list of products that commonly contain asbestos:Roofing shinglesFelt and tar joint compoundCement pipesWall boardCeiling tilesSiding gasketsLaboratory hoodsMastics and sealantsBrake liningsFire doorsInsulation on some wiringCooling towersPaintTaping compound (thermal)Flexible duct connectorsGreenhouse materialsAppliance insulationSheet vinyl floor coveringPlaster sprayed-on fireproofingRefractory cement chalk boardsInsulation on steam pipesHeat resistant gloves and suitsAsbestos blankets Cork Board 

Asbestos History

Asbestos was first discovered to be dangerous at the beginning of last century. It has been known as a carcinogen since the 1960s and was subsequently banned in more than 30 countries under grounds that there is no safe level of asbestos exposure. Mining and manufacture of most asbestos products has been ceased in the U.S., yet we continue to import more than 30 million pounds of asbestos in foreign products each year. A new recommendation by an EPA-sponsored panel of asbestos industry members and other experts on the topic called for a ban of all importation, manufacture, and mining of asbestos and asbestos containing products in the U.S. Although this may be a good sign, it also means that new risks of asbestos exposure are still developing. Since asbestos cancer and asbestos diseases take years and even decades to develop, many more cases of asbestos disease will be diagnosed. 

Asbestos Disease Awareness Organization

One of the most vocal groups fighting for asbestos disease awareness is the Asbestos Disease Awareness Organization (ADAO). ADAO was founded by asbestos victims and their families in 2004. ADAO seeks to give asbestos victims and concerned citizens a united voice to help ensure that their rights are fairly represented and protected, while raising public awareness about the dangers of asbestos exposure and often deadly asbestos related diseases. ADAO is an independent organization funded through voluntary contributions and staffed by volunteers. Among ADAO’s accomplishments:

  • Testified before the EPW full Senate Committee on June 12, 2007 about the health effects of asbestos and added support to Senator Patty Murray’s bill, S.742, the Ban Asbestos in America Act of 2007.
  • Assisted in drafting and passage of Senate Resolution 448/43 designating April 1, 2005 as National Asbestos Awareness Day
  • Organized the first International Asbestos Awareness Day on April 1, 2005
  • Assisted in drafting and passage Senate Resolution designating April 1, 2006 as National Asbestos Awareness Day
  • Assisted in drafting and passage of Senate Resolution 108 declaring the week of April 1-7 as National Asbestos Week and urged the Surgeon General to warn and educate Americans that asbestos exposure may be hazardous to their health.
  • Developed resources, tools and support systems for victims and their families in both English, Spanish and French
  • Met and/or contacted every U.S. Senator, special assistant to President Bush and Union Health and Safety Directors
  • Met in the White House with Domestic Policy Counsel to President Bush three times.

For more information, visit ADAO online at www.asbestosdiseaseawareness.org

Asbestos Legislation

On March 1, 2007, Senator Patty Murray (D-WA) introduced S. 742: Ban Asbestos in America Act of 2007 to the 110th Congress. This is an act to amend the Toxic Substances Control Act to reduce the health risks posed by asbestos-containing materials and products having asbestos-containing material, and for other purposes. The bill is an effort to ban all production and use of asbestos in America , launch public education campaigns to raise awareness about its dangers and expand research and treatment of diseases cause by asbestos. Murray’s legislation, which was first introduced in the 107th Congress, will also authorize additional studies to determine which commercial products today still contain asbestos, increase funding for asbestos-related diseases, and call for a national registry to help public health professionals track this deadly asbestos-related disease. “We commend Senator Murray for all of her efforts to ban asbestos in the United States ,” said Linda Reinstein, Executive Director and Cofounder of Asbestos Disease Awareness Organization (ADAO). “Senator Murray has shown great strength and leadership as she leads the fight to have this deadly substance banned forever – which will save thousands of lives by preventing asbestos-related illnesses and paving the road to recovery for victims and their families.” The occurrence of asbestos-related diseases, including , lung cancer and asbestosis, is growing out of control. Studies estimate that during the next decade, 100,000 victims in the United States will die of an asbestos related disease – equaling 30 deaths per day. The bill passed in the Senate on Oct. 4, 2007 by Unanimous Consent. A record of each representative’s position was not kept. The bill now goes on to be voted on in the House. Debate may be taking place on a companion bill in the House, rather than this particular bill.