Hereditary Mixed Polyposis Syndrome

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What is hereditary mixed polyposis syndrome?

Hereditary mixed polyposis syndrome (HMPS) is a hereditary condition that is associated with an increased risk of developing polyps (growths of normal tissue that form lumps) in the digestive tract. As the name suggests, a variety of polyps may occur. The most common polyp type is the hamartomatous juvenile polyp. A hamartoma is a growth of normal-appearing tissue that builds up into a noncancerous tumor. However, the growth can turn into cancer over time. And, the term juvenile refers to the type of polyp (juvenile polyp), not the age of the person. Adenomatous polyps (growths in the lining of the colon that can become cancerous) and hyperplastic polyps (noncancerous growths in the lining of the colon) may occur as well. People with HMPS also have an increased risk of developing colorectal cancer.

What causes HMPS?

HMPS is a genetic condition. This means that the risk of polyps and cancer can be passed from generation to generation in a family. There is currently no specific gene that has been identified to cause HMPS. 

How is HMPS inherited?

Normally, every cell has two copies of each gene: one inherited from the mother and one inherited from the father. HMPS is believed to follow an autosomal dominant inheritance pattern, in which a mutation (alteration) needs to happen in only one copy of the gene for the person to have an increased risk of getting that disease. This means that a parent with a gene mutation may pass along a copy of their normal gene or a copy of the gene with the mutation. Therefore, a child who has a parent with a mutation has a 50% chance of inheriting that mutation. A brother, sister, or parent of a person who has a mutation also has a 50% chance of having the same mutation. 

How common is HMPS?

HMPS is considered to be rare.

How is HMPS diagnosed?

There are no specific diagnostic criteria for HMPS. HMPS is suspected in individuals and families with a history of multiple colon polyps of different types. It is also important to consider the possibility of one of the other hereditary polyposis syndromes, such as familial adenomatous polyposis, Peutz-Jeghers syndrome, and juvenile polyposis syndrome. There is currently no blood test that can help diagnose HMPS.

What are the estimated cancer risks associated with HMPS?

People with HMPS are considered to be at increased risk for developing colorectal cancer, but the amount of risk has not been estimated. 

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