Asbestos lung cancer

Lump graphite, 12 784-785, 793 Lump quicklime, 15 28 Luna Innovations, 1 718 Lung cancer, asbestos and, 3 316 Lungs... 

It is now known that asbestos is a carcinogen. When handled, asbestos releases dust particles that are easily inhaled and can cause lung cancer. Asbestos materials found in older homes and buildings should be removed by firms bcensed by the Environmental Protection Agency (EPA). 

The replacement of asbestos fibers by other fibrous materials has raised similar health issues in relation to substitute materials. However, since lung cancer has a latency period of approximately 25 years, and since the fiber exposure levels in contemporary industries is far lower than those which prevailed half a century ago, the epidemiological data on most substitutes is insufficient. A possible exception is slag fibers for which several studies on worker populations are available over extended periods (44) some results show a substantial increase in lung cancer occurrence. Consequentiy, the toxicity of asbestos substitute fibers remains a subject of active investigation. 

Bronchogenic carcinoma A lung cancer associated with asbestos exposure. 

The a-tocopherol, P-carotene (ATBC) Cancer Prevention study was a randomised-controlled trial that tested the effects of daily doses of either 50 mg (50 lU) vitamin E (all-racemic a-tocopherol acetate), or 20 mg of P-carotene, or both with that of a placebo, in a population of more than 29,000 male smokers for 5-8 years. No reduction in lung cancer or major coronary events was observed with any of the treatments. What was more startling was the unexpected increases in risk of death from lung cancer and ischemic heart disease with P-carotene supplementation (ATBC Cancer Prevention Study Group, 1994). Increases in the risk of both lung cancer and cardiovascular disease mortality were also observed in the P-carotene and Retinol Efficacy Trial (CARET), which tested the effects of combined treatment with 30 mg/d P-carotene and retinyl pahnitate (25,000 lU/d) in 18,000 men and women with a history of cigarette smoking or occupational exposure to asbestos (Hennekens et al, 1996). 

From the above it can be concluded that the risk for lung cancer induction from chronic indoor exposure to Rn-d is unlikely to be higher than 1.10 4/mSv. in order to understand the magnitude of this risk it has to be emphasized that man can be exposed to a multitude of different hazardous materials in the indoor atmosphere besides Rn-d, such as formaldehyde, nitrogen dioxide, carbon monoxide, nitrosamines, polyaromatic hydrocarbons, volatile organic compounds, asbestos and pesticides (Gammage and Kaye, 1985). 

Figure 1. The age-specific incidence of lung cancer deaths in male cigarette smokers and nonsmokers (Kahn, 1966, Appendix Table A). The lifetime incidence for nonsmokers includes lung cancers attributable to passive smoking, asbestos inhalation, and other occupational exposures.

Cigarette smoking is responsible for about 80% of lung cancer cases. Other risk factors include exposure to respiratory carcinogens (e.g., asbestos, benzene), genetic risk factors, and history of other lung diseases (e.g., tuberculosis, pulmonary fibrosis). 

Adverse effects associated with multiple chemical exposures associated with rocket testing at a commercial defense test facility. This study evaluated the excess mortality of workers employed at a rocket test site over a period beginning in the 1950s. Excess lung cancer was identified in this cohort of workers and their health outcomes were possibly associated with exposure to hydrazines, nitrosamines, asbestos, trichloroethylene, and other chemicals. 

Asbestos is generally made up of fiber bundles that can be broken up into long, thin fibers. We now know from various studies that when this friable substance is released into the air and inhaled into the lungs over a period of time, it can lead to a higher risk of lung cancer and a... 

The plasma vitrification can be used also for asbestos waste which is a hazardous, fibrous, dusty material causing danger for human beings such as lung cancer - mesothelioma. 

---