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HOXB13-associated prostate cancer
This condition involves an increased inherited risk for prostate cancer, particularly early-onset or more aggressive forms. It primarily affects biological males and is important for family members to consider when managing their health.
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Overview
HOXB13-associated prostate cancer is a hereditary form of prostate cancer linked to alterations in the HOXB13 gene. While prostate cancer is common, changes in HOXB13 significantly increase an individual's lifetime risk of developing the disease [PMID:22037047]. These genetic changes do not cause prostate cancer in everyone who inherits them, but they do make developing the condition more likely. This type of prostate cancer is considered rare, but individuals with a family history of prostate cancer, especially at younger ages, may be referred for genetic counselling and testing.
Symptoms & clinical features
Prostate cancer, regardless of its genetic cause, often presents with similar symptoms. In early stages, there may be no noticeable symptoms. As the cancer progresses, symptoms can include difficulties with urination, such as a weaker stream, increased frequency, or a need to urinate more often at night. Other potential symptoms are blood in the urine or semen, pain in the lower back, hips, or pelvis, and unexplained weight loss [PMID:29668351]. These symptoms can also be caused by non-cancerous conditions of the prostate, such as benign prostatic hyperplasia (BPH). Therefore, any new or concerning symptoms should be discussed with a doctor for proper evaluation.
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Affected organs
The primary organ affected in HOXB13-associated prostate cancer is the prostate gland. This is a small gland located below the bladder in biological males, which produces seminal fluid. While the cancer originates in the prostate, if it spreads, it can affect other parts of the body, including lymph nodes and bones. The inherited HOXB13 gene change itself does not cause problems in other organs, but rather predisposes cells within the prostate to become cancerous.
Risks & severity
Individuals with a pathogenic variant in HOXB13 have a significantly elevated lifetime risk of developing prostate cancer compared to the general population [PMID:22037047]. Some research suggests this risk can be significantly increased, and the cancer may tend to develop at a younger age or be more aggressive in nature. The exact age of onset and severity can vary greatly between individuals, even within the same family. It is crucial to understand that inheriting a HOXB13 variant does not mean cancer is inevitable, but it does mean a heightened risk. Clinical management often involves earlier and more frequent screening to detect any cancer at its earliest, most treatable stage.
Genetic causes
HOXB13-associated prostate cancer is caused by specific inherited changes in the HOXB13 gene. This gene provides instructions for making a protein that acts as a transcription factor. Transcription factors are proteins that help control which genes are turned on or off in cells. The HOXB13 protein plays a vital role in the normal development of the prostate gland and in regulating the growth and behaviour of prostate cells [PMID:22037047]. When there is a pathogenic variant in HOXB13, the protein may not function correctly, which can disrupt the normal cell growth and differentiation processes in the prostate, increasing the likelihood of cancerous changes occurring. The most commonly identified pathogenic variant is known as G84E.
- HOXB13 homeobox B13The HOXB13 gene provides instructions for a protein that acts as a transcription factor, playing a key role in growth, development, and maintaining normal cell division.
Inheritance pattern
HOXB13-associated prostate cancer follows an autosomal dominant inheritance pattern. This means that a person only needs to inherit one copy of the altered HOXB13 gene from one parent to have an increased risk of developing prostate cancer. If a parent carries a pathogenic variant in HOXB13, each of their children has a 50% (1 in 2) chance of inheriting that variant, regardless of their sex. While both males and females can inherit the altered gene, only biological males are at risk of developing prostate cancer because females do not have a prostate gland. However, women who inherit the variant can still pass it on to their children.
Each child has a 50% chance of inheriting the pathogenic variant, regardless of sex.
Diagnosis & testing
A diagnosis of HOXB13-associated prostate cancer risk is confirmed through genetic testing. This testing typically involves a blood or saliva sample from which DNA is extracted and analysed to look for specific changes in the HOXB13 gene. Genetic testing is usually considered for individuals with a strong family history of prostate cancer, particularly if there are multiple affected relatives, cases at younger ages, or aggressive forms of the disease. In the UK, referrals for genetic testing are often initiated by a GP or specialist (e.g., urologist, oncologist) to a clinical genetics service. Genetic testing for prostate cancer predisposition genes, including HOXB13, falls under specific NHS Genomic Medicine Service (GMS) pathways, identifiable by R-codes such as R196 'Prostate cancer predisposition' or R210 'Early onset and/or familial prostate cancer'.
Management & lifestyle
Managing an inherited risk for HOXB13-associated prostate cancer typically involves a personalised surveillance plan aimed at early detection. This often includes regular prostate-specific antigen (PSA) blood tests and digital rectal examinations (DRE), usually starting at an earlier age and performed more frequently than for the general population. The exact screening protocol will be determined by a specialist, such as a urologist, in consultation with the individual and often a genetic counsellor. Lifestyle factors such as a healthy diet and regular exercise are generally recommended for overall health, but their specific impact on HOXB13-related prostate cancer risk is still an area of research. Genetic counsellors play a key role in explaining the implications of a HOXB13 variant, discussing family planning considerations, and coordinating care within the NHS framework.
UK care pathway
In the UK, individuals with a family history suggestive of hereditary prostate cancer may be referred through their GP to an NHS clinical genetics service. These services offer genetic counselling to discuss the benefits and limitations of genetic testing. If testing is deemed appropriate, it will be conducted through the NHS Genomic Medicine Service, adhering to relevant R-codes like R196 or R210. Following a positive genetic test result, individuals will typically be supported by a multidisciplinary team, which may include urologists, oncologists, and genetic counsellors, to develop a tailored management and surveillance plan in line with national guidelines.
Frequently asked questions
What does it mean to have a 'pathogenic variant' in HOXB13?
A pathogenic variant is a specific change in the HOXB13 gene that is known to increase a person's risk of developing prostate cancer. It doesn't mean you will definitely get cancer, but your chances are higher than someone without this variant.
If my father has a HOXB13 variant, what are my chances of inheriting it?
If your father has a pathogenic HOXB13 variant, you have a 50% (1 in 2) chance of inheriting it. This applies to each child, regardless of whether they are male or female. Genetic counselling can provide more personalised information.
Will I definitely get prostate cancer if I have a HOXB13 variant?
No, inheriting a HOXB13 variant does not mean you will definitely develop prostate cancer. It increases your lifetime risk, and often leads to earlier or more aggressive cancer if it does occur. Regular screening and early detection are key parts of managing this increased risk.
What kind of screening is recommended if I have a HOXB13 variant?
Typically, you would begin earlier and more frequent screening, which may include regular PSA blood tests and digital rectal examinations (DREs). A specialist will discuss a personalised screening schedule with you, often starting from your 40s or 50s.
Can women inherit the HOXB13 variant?
Yes, women can inherit the HOXB13 variant from a parent. Although women do not have a prostate gland and therefore cannot develop prostate cancer themselves, they can still pass the variant on to their children, including their sons who would then be at increased risk.