Cancer Types – Mesothelioma
Approved by the Cancer.Net Editorial Board, 02/2019
Mesothelioma is a rare cancer that begins in the lining of different internal organs of the body.
- Approximately 75% to 80% of mesotheliomas begin in the lining surrounding the lungs, called pleural mesothelioma. Pleural mesothelioma begins in the chest cavity, but it does not start in the lungs. As such, it is often incorrectly called a lung cancer.
- Peritoneal mesothelioma makes up about 10% to 20% of mesotheliomas. This type of mesothelioma begins in the tissue surrounding the abdominal area, called the peritoneum.
The rarest types of mesothelioma include:
- Mesothelioma that begins in the lining around the heart, called the pericardium
- Mesothelioma that begins in the lining around a man’s testicles, called the tunica vaginalis
Types of mesothelioma
There are 3 main types of mesothelioma:
- Epithelioid type. About 70% of people diagnosed with mesothelioma have the epithelioid type. Epithelioid mesothelioma may grow slower and chemotherapy often works better for this type.
- Sarcomatoid type. Between 7% to 15% of people diagnosed with mesothelioma have the sarcomatoid type. Sarcomatoid mesothelioma may be more resistant to treatment compared with the other 2 types of mesothelioma. Standard chemotherapy often does not work well for this type of mesothelioma.
- Mixed, or biphasic, type. Between 10% to 20% of people diagnosed with mesothelioma have the mixed type. The term “mixed” or “biphasic” means that the cancer contains both epithelioid and sarcomatoid types. Treatment does not work as well for this type when compared with the epithelioid type. However, treatment for this type often works better than for the sarcomatoid type.
Read more about mesothelioma here.