PALB2 – Gene, Mutation & Cancer Risk
PALB2 is a tumor suppressor gene. Mutations in this gene significantly increase the risk of breast, ovarian, and pancreatic cancer.
Things worth knowing about "PALB2"
PALB2 is a tumor suppressor gene. Mutations in this gene significantly increase the risk of breast, ovarian, and pancreatic cancer.
What is PALB2?
PALB2 (Partner and Localizer of BRCA2) is a human gene that provides the blueprint for a protein of the same name. This protein plays a critical role in repairing damage to genetic material (DNA). PALB2 works closely with the well-known tumor suppressor proteins BRCA1 and BRCA2 and is an essential component of the cellular DNA repair system.
Function of the PALB2 Gene
The PALB2 protein fulfills several important tasks within the cell:
- It connects BRCA1 and BRCA2 to enable their cooperation in DNA repair.
- It is involved in homologous recombination – a precise mechanism by which the cell repairs double-strand breaks in DNA without errors.
- It stabilizes BRCA2 in the cell nucleus and ensures the repair protein is delivered to the correct location.
If PALB2 function is lost, DNA damage can no longer be repaired correctly. This leads to an accumulation of genetic changes within the cell – a critical step in the development of cancer.
PALB2 Mutations and Cancer Risk
Changes (mutations) in the PALB2 gene can be inherited and significantly increase the risk of developing certain types of cancer. This is referred to as a pathogenic germline mutation.
Breast Cancer Risk
Women who carry a PALB2 mutation have a substantially elevated risk of developing breast cancer. Studies indicate that the lifetime breast cancer risk for affected women may be approximately 35 to 60 percent, depending on family history. This makes PALB2 one of the most important known high-risk genes for breast cancer, ranking after BRCA1 and BRCA2.
Ovarian Cancer Risk
The risk of ovarian cancer is also elevated in PALB2 mutation carriers, although to a lesser degree than with BRCA1/2 mutations. The exact magnitude of this risk is still being investigated in ongoing studies.
Pancreatic Cancer Risk
PALB2 mutations are also associated with an increased risk of pancreatic cancer. The risk is several times higher compared to the general population.
Other Cancer Types
There is evidence suggesting that PALB2 mutations may also increase the risk of other tumor types, such as stomach cancer or male breast cancer, although the data in these areas is less conclusive.
Inheritance
PALB2 mutations are inherited in an autosomal dominant pattern. This means that a single altered copy of the gene (from one parent) is sufficient to pass on the increased cancer risk. Each child of a carrier has a 50 percent chance of inheriting the mutation. The actual disease risk, however, depends on additional factors such as lifestyle, environment, and other genetic influences.
Diagnosis and Genetic Testing
A PALB2 mutation is diagnosed through a molecular genetic test performed on a blood or saliva sample. Such testing is indicated in situations including:
- Personal history of breast cancer, especially at a young age
- Family clustering of breast, ovarian, or pancreatic cancer
- A known PALB2 mutation within the family
- Negative BRCA1/2 test result despite a high familial risk profile
Genetic tests are typically offered and performed within the framework of a genetic counseling consultation, ensuring that individuals fully understand the significance, possibilities, and limitations of the results.
Prevention and Risk Management
Specific recommendations for cancer screening and risk reduction exist for individuals with a confirmed PALB2 mutation:
- Intensified early detection: Regular breast examinations starting at an earlier age than usual, often supplemented by breast MRI scans.
- Risk-reducing surgery: In certain cases, prophylactic (preventive) mastectomy or removal of the ovaries may be considered.
- Chemoprevention: Certain medications can reduce the risk of breast cancer.
- Regular medical follow-up at specialized centers for hereditary breast and ovarian cancer.
Relevance for Cancer Treatment
Knowledge of a PALB2 mutation also has implications for the treatment of individuals who have already developed cancer. Because the DNA repair system is impaired, PALB2-associated tumors frequently respond well to specific therapies:
- PARP inhibitors (e.g., olaparib, niraparib): These drugs block an additional DNA repair pathway, leading to the targeted death of tumor cells carrying a PALB2 mutation.
- Platinum-based chemotherapy: These agents are also particularly effective against tumors with a defective homologous recombination system.
References
- Antoniou AC et al. - Breast-Cancer Risk in Families with Mutations in PALB2. New England Journal of Medicine, 2014. DOI: 10.1056/NEJMoa1400382
- Tischkowitz M, Xia B. - PALB2/FANCN: Recombining Cancer and Fanconi Anemia. Cancer Research, 2010. DOI: 10.1158/0008-5472.CAN-09-2773
- National Cancer Institute (NCI) - PALB2 Gene and Cancer Risk. Bethesda, MD, USA. Available at: www.cancer.gov
Building Blocks for a Healthy Life
As an integrated manufacturer, we develop & produce evidence-based, patented, and non-patented formulations. We work exclusively with plant and natural extracts according to the strictest purity & quality standards.
The combination of science & modern technology with the laws of nature creates solutions consistently tailored to humans – for the highest good: health.
Verwandte Produkte
For Healthy Oral Flora & Dental Care
Formulated lozenges with Dentalac®, lactic acid bacteria, and Lactoferrin CLN®
For your universal protection
As one of the most valuable proteins in the body, lactoferrin is a natural component of the immune system.
For your iron balance
Specially formulated for your iron balance with plant-based curry leaf iron, Lactoferrin CLN®, and natural Vitamin C from rose hips.