Asbestos-Related Lung Cancer

Smoking is the primary cause in most lung cancer diagnoses, but about 4 percent of cases are traced back to asbestos exposure. Asbestos-related lung cancer is estimated to kill more than 6,000 Americans per year, making it the most lethal of all asbestos-related illnesses.

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This page features: 11 cited research articles

Lung cancer is the leading cause of cancer death in the United States, killing more Americans each year than breast, prostate and colon cancer combined. Medical researchers first made a probable causal relationship between asbestos exposure and lung cancer in 1935. Seven years later, a member of the National Cancer Institute confirmed asbestos as a cause of lung cancer.

Asbestos Lung Cancer Facts

  • Symptoms include shortness of breath, chest pain and coughing up blood
  • May develop 15 to 35 years after asbestos exposure
  • Two main forms are small cell and non-small cell
  • Prognosis and treatment depend on type and stage of cancer

Study after study continued to show the cause-effect relationship of asbestos and lung cancer, and in 1986, the Occupational Safety and Health Administration (OSHA) proclaimed lung cancer as the greatest risk for Americans who work with asbestos.

Symptoms and Diagnosis of Asbestos-Related Lung Cancer

Whether lung cancer is associated with asbestos exposure or another cause, it presents the same general symptoms:

  • Persistent coughing
  • Shortness of breath
  • Chest discomfort or pain
  • Hoarseness or wheezing
  • Coughing up blood
  • Chronic respiratory infections
  • Fatigue and loss of appetite
  • Swelling of the face or neck

These symptoms typically only arise once the cancer reaches a late stage of development, so it is rare for lung cancer to be diagnosed in an early stage unless a patient is regularly screened. Patients with a history of asbestos exposure should seek regular screening for asbestos-related diseases.

The diagnostic process begins with imaging scans such as X-rays and CT scans. If the patient is coughing up sputum, which is a mixture of saliva and mucus, a sputum cytology test can reveal the presence of cancer cells.

To make a definitive diagnosis of cancer, however, a pathologist usually has to examine a sample of suspicious tissue under a microscope. The biopsy sample may be extracted through a long needle or with a special tool called a bronchoscope that is passed down the throat and into the airways of the lungs.

Lung Cancer Treatment:

Treatment options include surgery, chemotherapy, radiation therapy and immunotherapy, and experimental approaches may be available through clinical trials. A patient’s treatment plan is determined in large part by the stage and histological type of the cancer as well as the patient’s overall health.

Learn more about treatment for asbestos-related lung cancer
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How Does Asbestos Cause Lung Cancer?

When a person inhales asbestos, microscopic fibers of the toxic mineral can become permanently lodged in the person’s lung tissue. Over many years, these fibers may cause enough irritation and cellular damage to generate cancer cells that grow into a tumor.

Quick Fact

Lung cancer is the second-most-common cancer diagnosis in the USA; 220,000 Americans diagnosed annually.

Whether someone develops lung cancer or any other asbestos-related disease depends on their overall health, genetics and the duration and intensity of the asbestos exposure.

All asbestos-related diseases have a long latency period from the time of initial exposure to the onset of symptoms. Asbestos-related lung cancer typically takes between 15 and 35 years to develop. The latency periods depends on the level of exposure and whether the lungs are affected by additional carcinogens such as cigarettes.

Mesothelioma Versus Asbestos-Related Lung Cancer:

Both diseases take decades to develop but only months to spread to distant organs. The two forms of cancer involve similar diagnostic procedures, but they differ in risk factors, physical characteristics and treatment techniques.

Learn more about mesothelioma and lung cancer

How Are People Exposed to Asbestos?

U.S. companies manufactured a wide variety of asbestos-containing products from the late 1800s up until the 1980s, and the mineral was mined at many sites across North America. The mining and commercial use of asbestos is now highly regulated in the United States and banned completely in most developed nations.

Because of the long latency period of asbestos-related lung cancer, most cases diagnosed today were caused by asbestos exposure that occurred decades ago before safety regulations existed. Occupational asbestos exposure is the primary cause of asbestos-related disease, with the most at-risk professions involving mining, construction, heavy industry, shipbuilding and firefighting.

Veterans are also a high-risk group for asbestos-related lung cancer because of the military’s heavy use of asbestos products in bases, vehicles and ships.

Asbestos-Related Lung Cancer and Smoking:

The risk of lung cancer is much higher among asbestos-exposed smokers because smoking impairs the lungs’ ability to dispel asbestos fibers. Smokers who have been exposed to asbestos should stop smoking immediately and seek annual screenings for lung cancer.

Learn more about asbestos-related diseases and smoking

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Types of Lung Cancer

There are two primary forms of lung cancer: Small cell and non-small cell. Non-small cell lung cancer (NSCLC) is less aggressive and more common, accounting for more than 80 percent of all lung cancer cases. Small cell lung cancer (SCLC) makes up less than 20 percent of cases and is more difficult to treat.

Asbestos exposure can cause any one of the various types and subtypes of lung cancer.

Non-Small Cell Lung Cancer

There are three primary subtypes of NSCLC distinguishable by the appearance and chemical makeup of their cells:

  • Squamous cell (epidermoid) carcinoma is the most common variety of NSCLC, forming in flat cells that line the inside airways of the lungs. About 25 to 30 percent of all lung cancers are squamous, and this is the most prevalent type of NSCLC among men.
  • Adenocarcinoma forms in mucus-producing glandular tissues that line the air sacs (alveoli) of the lungs. It is more common in women than men, and it is the predominant type of cancer among nonsmokers.
  • Large cell (undifferentiated) carcinoma can appear in any part of the lung, and this type grows and spreads more rapidly than the other varieties of NSCLC.

Small Cell Lung Cancer

Typically originating in the bronchi near the center of the chest, SCLC is aggressive and spreads quickly throughout the body. The cancer can disperse from its initial location before presenting any symptoms, rapidly spreading to other parts of the body such as the lymph nodes, bones, liver, adrenal glands or brain.

Unfortunately, surgery is rarely an option with SCLC because of this factor. Doctors instead rely on chemotherapy that attacks cancer cells all throughout the body.

Prognosis and Survival Rates:

The prognosis for someone with lung cancer depends on the type and subtype of the disease, the patient’s overall health and how far the cancer has spread by the time it is diagnosed. In the United States, about 18 percent of lung cancer patients survive more than 5 years after diagnosis.

Learn more about asbestos-related lung cancer prognosis

How Do Doctors Link Lung Cancer to Asbestos?

The Helsinki Criteria were established in 1997 to help doctors determine when respiratory diseases are caused by asbestos. For a lung cancer case to be diagnosed as asbestos related, it must fit two criteria:

Latency period:

The lung cancer must have developed at least 10 years after the initial exposure to asbestos.

Evidence of asbestos exposure:

One of the following must be documented:

  • Diagnosis of asbestosis.
  • Higher than normal asbestos fibers in lung tissue.
  • Exposure to levels of airborne asbestos equal to or greater than 25 fibers per milliliter of air a year (f/mL-yr). To reach this threshold in a one-year work period, the patient must have been exposed to a level of 25 f/mL. Such a high level is typically only found in asbestos manufacturing and asbestos insulation work. To reach 25 f/mL-yr in a five-year period, an individual must have been exposed to asbestos at a level of 5 f/mL. This level is typical of shipbuilding and construction work.

Asbestos-Related Lung Cancer and Asbestosis:

The presence of asbestosis is a reliable diagnostic marker that a patient was exposed to asbestos enough to develop lung cancer. Asbestosis and lung cancer are commonly associated because the risk for both rises in parallel as asbestos fibers accumulate in lung tissue.

Learn more about asbestosis

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Daniel King

Daniel King joined Asbestos.com in 2017. He comes from a military family and attended high school on a military base. He feels a close connection to veterans, military families and the many hardships they face. As an investigative writer with interests in mesothelioma research and environmental issues, he seeks to educate others about the dangers of asbestos exposure to protect them from the deadly carcinogen linked to asbestos-related conditions.

Sources
  1. U.S. National Library of Medicine. (2017, October 27). Lung Cancer. Retrieved from https://medlineplus.gov/lungcancer.html
  2. Mayo Clinic Staff. (2015, September 25). Lung Cancer. Retrieved from https://www.mayoclinic.org/diseases-conditions/lung-cancer/basics/definition/con-20025531
  3. American Cancer Society. (2015, September 15). Asbestos and Cancer Risk. Retrieved from https://www.cancer.org/cancer/cancer-causes/asbestos.html
  4. Wolff, H. et al. (2015, January). Asbestos, asbestosis, and cancer, the Helsinki criteria for diagnosis and attribution 2014: recommendations. Retrieved from https://www.ncbi.nlm.nih.gov/pubmed/25299403
  5. American Cancer Society. (n.d.). Lung Cancer. Retrieved from https://www.cancer.org/cancer/lung-cancer.html
  6. National Cancer Institute. (n.d.). Cancer Stat Facts: Lung and Bronchus Cancer. Retrieved from https://seer.cancer.gov/statfacts/html/lungb.html
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