Agency for Toxic Substances and Disease Registry

The Agency for Toxic Substances and Disease Registry is responsible for assessing health risks at Superfund sites and other hazardous waste locations across the country. It is an enormous job that calls for expertise in a very wide range of scientific fields—from veterinary medicine to meteorology. Sometimes, with the best knowledge available, the risks are uncertain. And the agency has lost several hundred staff positions over the last few years.

In addition, the agency has faced criticism from Congressional members and elsewhere that it is too driven by government and industry desires to minimize potential health risks from toxic exposures.

Mesothelioma Common Questions

What is Mesothelioma? What is the difference between pleural mesothelioma and peritoneal mesothelioma?
Malignant mesothelioma is a disease in which a cancerous tumor grows on the mesothelium - the sac lining the internal body cavities. The specific type of mesothelioma is named for the tissue where the cancer started. Pleural mesothelioma starts in the chest, in the pleura that surrounds the lungs (outer lining of the lungs and internal chest wall). It makes up about 70% of mesothelioma cases. Peritoneal mesothelioma starts in the lining of the abdominal cavity.

Although sometimes referred to as "asbestos lung cancer", mesothelioma is not the same as lung cancer. Lung cancers occur inside the lung itself; mesothelioma occurs in the lining of the lung. Mesothelioma is rare, striking fewer than 3000 Americans per year.

How much exposure does it take to get the disease?

Very little exposure can result in mesothelioma. Sometimes people who worked with asbestos for as little as one or two months get mesothelioma. The "latency period" refers to the time between asbestos exposure and diagnosis of the disease. For mesothelioma, the latency period can be decades long, and people exposed in the 1940s, 50s, 60s, and 70s are now being diagnosed.

What are the symptoms of mesothelioma?
Our mesothelioma symptoms page goes into detail about the signs of this cancer. Please note that it is important to seek professional medical advice when trying to diagnose for mesothelioma. The major symptoms include:

•Shortness of breath caused by expanding pleural effusion
•Persistent dry cough
Other symptoms may include:

•Fatigue
•Night sweats
•Fever
•Pain under the rib cage
•Swelling or lumps in the abdomen
•Unexpected weight loss

Lung Anatomy

MESOTHELIOMA SYMPTOMS

The early symptoms of mesothelioma are generally non-specific, and may lead to a delay in diagnosis. Sometimes resembling viral pneumonia, pleural mesothelioma patients may present with shortness of breath, chest pain and/or persistent cough; some patients show no symptoms at all. A chest x-ray may show a build-up of fluid or pleural effusion (discussed below). The right lung is affected 60% of the time, with involvement of both lungs being seen in approximately 5% of patients at the time of diagnosis. Less common symptoms of pleural mesothelioma include fever, night sweats and weight loss. Symptoms of peritoneal mesothelioma may include pain or swelling in the abdomen due to a build-up of fluid, nausea, weight loss, bowel obstruction, anemia or swelling of the feet.

PLEASE KEEP IN MIND THAT THESE SYMPTOMS MAY BE CAUSED BY MESOTHELIOMA OR BY OTHER LESS SERIOUS CONDITIONS. ONLY A DOCTOR CAN MAKE A DEFINITIVE DIAGNOSIS.