TP53 Mutation and Breast Cancer
The TP53 genetic mutation can increase the risk of breast cancer. Learn more about this particular gene and how genetics are influencing research.
DNA building blocks are responsible for making genes, the blueprint of instructions for the human body and its functioning components. One specific gene called TP53, plays a crucial role in protecting our DNA and preventing breast cancer development. When changes (mutations) occur in this gene, they can significantly increase the risk of certain cancers, including breast cancer.
Understanding the role of the TP53 gene and what it means if you carry a TP53 mutation, can help individuals and families make informed decisions about their health, screening, and treatment options.
What is the TP53 gene?
The TP53 gene provides instructions for making a protein called p53, often referred to as the “guardian of the genome.” This protein helps regulate the repair of damaged DNA, controls how quickly cells divide, and triggers the natural death of cells when something goes wrong.
When the TP53 gene is working normally, it helps protect the body from cancer. But if it is altered or damaged, cells can grow uncontrollably, leading to tumour formation.
Everyone has two copies of the TP53 gene – one inherited from each biological parent. These genes produce a protein that helps protect the body by repairing DNA damage or removing cells that aren’t functioning properly. Because TP53 acts as a tumour-suppressor gene, it plays an important role in preventing breast cells from turning cancerous.
How common is a TP53 mutation?
TP53 mutations are relatively rare compared to other genetic mutations like BRCA1 and BRCA2. However, when they are present, they are strongly linked to a higher risk of several types of cancer, particularly early-onset breast cancer.
According to Cancer Australia, women with a TP53 mutation have around five times the risk of developing breast cancer compared to women without the mutation. This increased risk is particularly pronounced in women under the age of 40, where breast cancer occurs more frequently and often at younger ages.
TP53 and breast cancer risk
A TP53 mutation increases the risk of several cancers including breast, brain, bone, soft tissue, and adrenal cancers. For women, breast cancer is one of the more common cancers associated with this mutation, and typically occurs earlier in life than in the general population.
In many cases, TP53 mutations occur as part of a hereditary condition known as Li-Fraumeni Syndrome (LFS). People with this inherited condition have a significantly increased lifetime risk of developing multiple cancers, often before the age of 40.
Although TP53 mutations can influence how a tumour behaves, many factors affect outcomes, including early detection and access to appropriate treatment.
Research suggests that breast cancers associated with a TP53 mutation, on average, have lower recurrence-free and overall survival compared with breast cancers without this mutation. However, TP53 status is only one of many factors that can influence breast cancer outcomes. Individual prognosis can vary widely depending on the type of breast cancer, the stage at diagnosis, and the treatments received. For this reason, TP53 mutation status is considered alongside other clinical factors when planning care and follow-up.
Overall, a TP53 mutation can influence prognosis, but it is only one part of the bigger picture. Factors such as early detection and personalised treatment also play a major role.
TP53 gene testing
Genetic testing for TP53 may be recommended for people who have:
- breast cancer diagnosed before age 31
- a strong family history of some early-onset cancers, such as breast cancer, brain tumours, soft tissue or bone sarcomas, or adrenal cortical cancer
- multiple different cancers in one individual
- features that suggest an inherited cancer condition
- Rare cancers that are associated with a defective p53 gene
Testing is typically done through a blood or saliva sample. Because the results can have important medical and emotional implications, genetic counselling is an essential part of the process. Counselling helps explain what the results may mean for you and your family and guides decisions about screening and management
Living with a TP53 mutation
If you carry a TP53 mutation, your healthcare team may recommend a personalised approach to monitoring and reducing breast cancer risk. This may include the following strategies:
- Enhanced breast screening, such as regular breast MRI from age 20
- Risk-reducing surgical options, which may be discussed depending on your personal and family history
- Risk-reducing medications, such as estrogen blocking tablets may be considered to reduce the risk of hormone positive breast cancer occurrence
- Lifestyle considerations, such as maintaining a healthy weight, limiting alcohol, staying physically active, avoiding excessive sun exposure and avoiding tobacco
- Psychosocial support, including counselling services to help navigate decisions and family communication.
Whilst the above advice is specific to breast cancer. Guidelines also suggest colonoscopy and gastroscopy for colon cancer and gastric cancers, whole body MRI for sarcoma, annual skin checks for melanoma, and annual brain MRI for brain cancer.
These steps aim to support early detection and provide clearer pathways for managing breast cancer risk.
Latest research and clinical trials
Australian guidelines recognise TP53 as an important hereditary breast cancer gene, and there is ongoing work to better understand how reduced TP53 function influences cancer risk and early tumour development. National resources such as Cancer Australia and eviQ provide guidance on screening, risk reduction and support for people with inherited TP53 mutations, including those with Li-Fraumeni syndrome.
While there has been some hype surrounding pre-clinical models targeting mutant p53, clinical trials have failed to show success in drugs that target p53 to date. There are ongoing clinical trials focusing on targeting mutant p53 protein and reactivating its normal form.
The importance of TP53 awareness and action
If you have a family history of early-onset or multiple cancers, speaking with your general practitioner or a genetic counsellor can help determine whether TP53 testing is appropriate. Understanding your genetic risk supports informed decision-making and can guide screening, treatment and prevention options tailored to your needs.
Resources, clinical trials and support services can help you and your family navigate the next steps.
Frequently Asked Questions
What does a TP53 mutation lead to?
A TP53 mutation can reduce the body’s ability to manage DNA damage. This increases the chance that abnormal cells will grow and potentially develop into cancer. The specific risks vary depending on the individual and whether the mutation is inherited.
What does TP53 positive mean?
A “TP53 positive” result means that a genetic test has identified a harmful change in the TP53 gene. It does not mean you have cancer, but it does mean your cancer risk is increased compared to the general population. Your general practitioner or genetics counsellor will recommend a tailored screening and management plan.
What is a faulty TP53 Gene?
A “faulty” TP53 gene is one that has a harmful change, or mutation, which stops it from working as it should. Normally, TP53 helps protect the body by repairing DNA damage or removing cells that aren’t functioning properly. If one of the two TP53 genes you inherit from your biological parents is faulty, this protective process is weakened. This can increase the chance of abnormal breast cells developing into cancer over time.
Join Our Free Q&A Webinars
Don’t miss an opportunity to stay informed about the latest in breast cancer research and care. Join our FREE Q&A webinars, where we cover important topics including whether more young women are being diagnosed with breast cancer.
Stay Connected with Breast Cancer Trials
Don’t miss an opportunity to stay informed about the latest in breast cancer research and care. Sign up to our researcher’s newsletter via the form below to stay up to date.
