Von Hippel-Lindau (VHL) syndrome is a genetic predisposition to develop growths in different parts of the body, and is caused by changes (called mutations) in the VHL gene. These growths may be benign (non-cancerous) or malignant (cancerous), and most commonly occur in the brain/central nervous system, kidneys, adrenal glands, reproductive organs, and pancreas. Both men and women can be diagnosed with VHL. While signs of VHL can appear in childhood and the teenage years, some individuals do not know they have it until they are older adults.
Individuals with VHL can live normal lives, but they may develop serious health problems if they are not closely monitored by a healthcare provider who has experience with it. VHL can potentially affect multiple body systems, and can affect individuals very differently.
We have over 20,000 different genes in the body. These genes are like instruction manuals for how to build a protein, and each protein has an important function that helps to keep our body working how it should. The VHL gene makes a protein called the VHL protein. The VHL works with other proteins to form a complex (think of it like a vacuum) that picks up other proteins that are damaged or not needed any longer and gets rid of them. Getting rid of these extra proteins helps to make sure the cells can function how they are supposed to.
VHL gene mutations are inherited in an autosomal dominant pattern, meaning that children of someone who has a VHL gene mutation have a 50% risk to inherit the mutation and associated cancer risks. In 4 out of 5 (80%) cases of VHL, someone has inherited a nonworking VHL gene from a parent. In the other 1 in 5 (20%) cases, the nonworking gene was not inherited from a parent, and is something that is new to that person in the family (called a de novo mutation). Notably, women and men both have the VHL gene and have the same chances to inherit and pass down mutations in these genes. Therefore, both sides of the family are important when assessing inherited risk.
Genetic testing for mutations in VHL is currently available, but there are a few different ways to approach testing:
A diagnosis of VHL can be complex and therefore may be best conducted by a clinician familiar with VHL. A diagnosis can be made based on a review of medical records (clinical diagnosis), or by genetic testing for mutations in the VHL gene. Nearly all people who have a clinical diagnosis will be found to have a mutation in the VHL gene upon testing.
VHL can be divided into two subgroups defined by the chance for particular types of tumors or cancer. Genetic testing can also help to distinguish these subtypes:
|Chance of pheochromocytoma||Chance of kidney cancer|
|VHL type 1||Very low||Increased|
|VHL type 2a||Increased||Low|
|VHL type 2b||Increased||High|
|VHL type 2c||Increased||None|
There can be many different findings throughout many parts of the body in someone who has VHL. Here are some things that a doctor may look for to diagnose someone with VHL:
Medical management for someone with VHL can be complex, and should be overseen by a medical provider who is familiar with VHL. Because VHL affects people in very different ways, medical management should be tailored to an individual’s specific needs. The frequency of each screening tool is tailored to an individual’s age. Some options for surveillance include:
This is not a comprehensive list of recommendations, as many of these are tailored to meet someone’s specific needs and current health concerns.