How Do People Get Mesothelioma?

The primary cause of mesothelioma is asbestos exposure. Most cases trace back to occupational exposure in the workplace.

Mesothelioma carries a long latency period. It can take anywhere from 15 to 70 years for the cancer to develop after a person’s first exposure to asbestos.

Quick Fact
Between 8% and 13% of workers with heavy exposure to asbestos eventually develop mesothelioma.

Secondary asbestos exposure also causes mesothelioma. It happens when workers unknowingly carry asbestos fibers home on clothing or equipment and inadvertently expose their families to the hazardous mineral. This type of exposure primarily affects spouses and children of asbestos workers.

When Was Mesothelioma First Discovered?

Tumors in the mesothelium were first identified in the mid-1700s. The term “mesothelioma” was first used in the early 1900s. It forms in the mesothelium, a protective layer that surrounds internal organs.

  • 1767
    Joseph Lieutaud is the founder of pathologic anatomy in France. He made the earliest mention of a tumor in the pleural mesothelium (lining of the lungs). Lieutaud documented the first recorded cases of pleural mesothelioma.
  • 1819
    René-Théophile-Hyacinthe Laennec is the French physician who invented the stethoscope. He suggested malignancy could arise from the pleura.
  • 1843
    Karl Freiherr von Rokitansky was a professor of pathological anatomy at Vienna University. He challenged that notion. He stated pleural cancer was always secondary to a primary cancer elsewhere in the body. This became the accepted theory of the medical establishment for many years. He described primary tumors of the peritoneum in 1954. It was among the first recorded cases of peritoneal mesothelioma.
  • Early 1900s
    The medical community began to accept that cancers could originate in the pleura.
  • 1909
    J.G. Adami coined the term “mesothelioma” to classify this rare cancer.
  • 1935
    Steven R. Gloyne was a British pathologist. He was the first to suggest that occupational asbestos exposure causes mesothelioma.
  • 1943
    H.W. Wedler was a German researcher. He published a study of asbestos workers. It showed a connection between asbestosis and pleural mesothelioma.
  • 1960
    J. Christopher Wagner published a study of 33 mesothelioma cases linked to an asbestos mine in South Africa. It confirmed the causal relationship beyond a reasonable doubt.

Scientific research continued to establish evidence linking mesothelioma to asbestos exposure. Workers began filing asbestos lawsuits in the 1920s. By the end of the 1970s, mesothelioma lawsuits became common.

Historical Studies of Mesothelioma and Asbestos Exposure


Decades of research have confirmed important facts about mesothelioma as a distinct diagnosis and its association with asbestos exposure. Medical research dating back to the 1940s established a connection between asbestos and this rare cancer.

Research on Mesothelioma and Asbestos
  • Groundbreaking German Study: In 1943, H.W. Wedler was the first to report a connection between asbestosis and cancer of the pleura among German asbestos workers. Approximately 20% of the workers developed cancer, with lung cancer more common than mesothelioma. Wedler’s study was well received in Germany. But the political climate at the time caused the rest of the world to ignore research coming from Nazi Germany.
  • South African Study: J.C. Wagner and physician Chris Sleggs led a study on asbestos exposure in 1960. It showed a connection between asbestos exposure and 33 cases of mesothelioma they discovered in residents of South Africa. Crocidolite asbestos mining contaminated the area around the mine. In eight cases, the asbestos exposure was occupational, but the other patients lived near the mines for most of their lives.
  • American Study: A Biological Effects of Asbestos conference took place in 1964. American physician Dr. Irving J. Selikoff presented research on more than 1,000 workers from the Union Asbestos & Rubber Company plant in Patterson, New Jersey. Selikoff found the mortality rate was 25% higher than expected. The deceased workers died from asbestosis, asbestos-related lung cancer, stomach cancer and colorectal cancers.
  • British Study: Another study found mesothelioma cases among people who lived near a London asbestos factory. British physician Molly Newhouse led the study. By 1968, the British Medical Journal claimed asbestos was the direct cause of most mesothelioma cases. Controversy still raged as to what types of asbestos were the most carcinogenic.
  • Environmental Studies: Research on environmental asbestos exposure and mesothelioma began in earnest in 2000. A study found that living within 2000 meters of asbestos operations led to a high risk of mesothelioma. A 2017 review looked at environmental asbestos exposure and found that occupational exposure remains the No. 1 cause of this rare cancer.

Early research established a clear link between asbestos exposure and mesothelioma. Through epidemiological investigations and clinical observations, researchers showed environmental and occupational asbestos exposure increases the risk of mesothelioma and other cancers.

History of Mesothelioma Treatment

Surgeries for mesothelioma were among the first treatments available for the disease. Radiation for mesothelioma emerged in the 1950s, and chemotherapy traces back to the 1970s.

Despite decades of research, there still is no definitive cure for the four types of mesothelioma. Advances in treatment allow patients to live longer, better-quality lives. Surgeries help some people live years longer than the average one-year prognosis.

Cutting-edge clinical trials look for a mesothelioma cure. Researchers also investigate ways to improve the diagnosis of mesothelioma. It may lead to earlier diagnoses and improved prognosis.

Advancements in Surgery

Surgical treatment of mesothelioma began in the 1940s with the use of pneumonectomy and pleurectomy. Pneumonectomy is also used to treat lung cancer.

A pleurectomy and decortication procedure developed in the 1960s. This mesothelioma surgery is still used today. It first helped patients with trapped lung caused by tuberculous empyema.

27% and 50%

Percentage of pleural patients and peritoneal patients, respectively, who qualify for surgery.

In the 1970s, doctors experimented with another surgery called an extrapleural pneumonectomy. The mortality rate for this surgery back then was as high as 31%. Today it’s around 4% in leading cancer centers.

Heated intraperitoneal chemotherapy, or HIPEC, came about in the 1990s. Dr. Paul Sugarbaker was among the first to use it on peritoneal mesothelioma patients. HIPEC surgery helps half of peritoneal mesothelioma patients live longer than five years.

Advancements in Chemotherapy

Several chemotherapy drugs treated mesothelioma from the 1970s through the 1990s. Chemotherapy response rates between 20% and 40% kept doctors searching for more options.

Quick Fact
In 2003, the phase III trial of cisplatin and pemetrexed (Alimta) reported the best chemotherapy response rate to date of 41.3%.

The U.S. Food and Drug Administration added cisplatin and pemetrexed to the standard-of-care treatment for mesothelioma. The drug combination remains the most common mesothelioma treatment.

In the 1990s, heated chemotherapy became an experimental treatment. Some patients have received heated chemotherapy without surgery, but that is not the norm.  

Advancements in Radiation Therapy

Doctors began experimenting with radiation therapy for mesothelioma in the 1950s. They used intrapleural instillation of radioactive colloidal gold. For decades, doctors believed radiation was too difficult to deliver to the lung lining. It was too easy to harm other vital organs such as the heart.

The advantages of radiation therapy for mesothelioma are getting better and better every day. New advanced types of radiation therapy are coming out, including proton therapy, which reduces the risk of healthy tissue damage by using particles that don’t escape the cancer and only stay within the cancer abnormal cells, not affecting healthy tissue.

A 2001 phase II clinical trial changed that perspective. It reported a low 13% local recurrence with radiation therapy. Application after extrapleural pneumonectomy surgery was key. Advanced techniques used today reduce radiation exposure to vital organs.

A new type of radiation called proton therapy uses a beam of protons instead of photons. It better targets mesothelioma tumors. Proton therapy is only available at certain cancer centers in the U.S.

FDA Approves New Therapies for Mesothelioma

The U.S. Food and Drug Administration approved two new therapies for mesothelioma in 2019 and 2020. One of them is the first immunotherapy combination approved for mesothelioma, and the other uses electrical fields to control cancer growth.

Recently Approved Mesothelioma Treatments
  • Immunotherapy: In 2020, the FDA approved the nivolumab (Opdivo) and ipilimumab (Yervoy) combination immunotherapy as a new first-line treatment for mesothelioma. Patients survive an average of 18 months on this new treatment compared to 14 months for first-line chemotherapy. Two-year survival is 41% for immunotherapy patients compared to 27% for chemotherapy patients.
  • Tumor Treating Fields: In 2019, the FDA approved Tumor Treating Fields in combination with chemotherapy for mesothelioma. Also known as TTFields, the therapy uses alternating electrical fields to control tumor growth. The addition of TTFields to chemotherapy helps patients live an average of six months longer.

The last time the FDA approved a treatment for mesothelioma was in 2003 when the agency approved two chemotherapy drugs. It can take decades for a therapy to receive approval because the FDA must ensure it is safe and effective for the public.

Emerging Treatments

Emerging treatments for mesothelioma are under development in clinical trials throughout the world. Therapies under investigation for mesothelioma treatment include new immunotherapy drugs, vaccine therapy, gene therapy, epigenetic therapy, virotherapy and anti-angiogenic drugs. 

Photodynamic therapy, which uses light and photosensitizing drugs to kill cancer cells, is also being tested on mesothelioma. Cryotherapy, which uses freezing temperatures to kill cancer cells, helped relieve chest pain in a 2020 study. Many of these therapies are available through clinical trials in the U.S.  

Future of Mesothelioma Research

Certain cancer centers in the U.S. feature programs that develop mesothelioma therapies and participate in clinical trials. For example, the International Mesothelioma Program at Brigham and Women’s Hospital in Boston is renowned for its surgical expertise and clinical trial leadership. The Pacific Mesothelioma Center in Los Angeles has been researching immunotherapy and gene therapy for mesothelioma since 2002. 

The mesothelioma program at the University of Chicago Comprehensive Cancer Center helped develop the only FDA-approved chemotherapy regimen for mesothelioma. The Mesothelioma International Treatment Program at AdventHealth in Celebration, Florida, is known for robotic surgery and clinical research.

Since 1991, the global mesothelioma community has united every two years for the International Mesothelioma Interest Group Meeting at different locations throughout the world. The conference brings together researchers and mesothelioma experts to share developments in treatment and discuss future research toward a cure.

The first and only standalone research facility developed to focus on mesothelioma opened in Sydney, Australia, in 2009. The Asbestos Diseases Research Institute conducts research primarily on mesothelioma treatment. The center also studies the diagnosis of mesothelioma and the psychological impact the cancer has on patients and families.

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