Genetics can influence pancreatic cancer risk and the way the disease develops. Inherited gene changes may increase susceptibility, while changes acquired within tumor cells can guide certain treatment decisions. Here is a closer look at the role of genetics in pancreatic cancer:
Understanding Inherited and Acquired Changes
Gene changes, also called mutations, fall into two main groups. The group depends on when the change appears in a person’s life, and that timing influences what it means for relatives. Doctors review both groups when evaluating pancreatic cancer risk or planning treatment.
Inherited Gene Changes
A person inherits these changes from a parent at conception. The change exists in nearly every cell in the body, and it passes down through families. Researchers estimate that inherited changes contribute to about 5 to 10 percent of pancreatic malignancy cases. When several relatives have pancreatic, breast, ovarian, or colon cancer, doctors often look for an inherited cause.
Acquired Gene Changes
Acquired changes develop during a person’s lifetime and appear only in tumor cells. Aging, smoking, and long-term inflammation from conditions such as chronic pancreatitis contribute to this type of damage. These changes do not pass to children, but they help doctors describe how a specific tumor behaves.
Exploring Inherited Risks
Scientists have identified several genes that increase the chance of pancreatic cancer when they carry a harmful change. A harmful change does not mean a person will develop the disease, but it does increase risk compared with the general population. The following genes appear most often in research and clinical guidelines:
- BRCA1 and BRCA2: These genes help repair damaged DNA, and changes in them also link to breast, ovarian, and prostate cancers.
- PALB2: This gene works with BRCA2 to fix DNA damage.
- ATM: This gene signals cells to stop and repair damage before they divide.
- CDKN2A: Changes in this gene appear in some families with both melanoma and pancreatic malignancy.
- PRSS1: Changes cause hereditary pancreatitis, which involves repeated inflammation of the pancreas from a young age.
Understanding Genetic Testing and Counseling
Genetic testing looks for inherited changes using a small blood or saliva sample. A laboratory examines a panel of genes, and results usually return within a few weeks. Professional guidelines often recommend inherited genetic testing for everyone diagnosed with pancreatic cancer, regardless of family history. People without a diagnosis often qualify when they have close relatives with the disease or a known family mutation.
A genetic counselor guides people through the process before and after testing. The counselor reviews family history, and they explain how findings affect relatives. Results fall into three categories: positive, negative, or a variant of uncertain significance, which means researchers do not yet know whether the change affects risk.
Connecting Genetic Findings To Care
Genetic results give doctors more information when they plan care. For people diagnosed with pancreatic cancer, an inherited BRCA1, BRCA2, or PALB2 change sometimes points toward specific treatment options, such as platinum-based chemotherapy or a targeted drug called a PARP inhibitor. Doctors also test tumor tissue for acquired changes, and these results help match some patients with targeted therapies or clinical trials. Your care team decides which options fit your situation. For people without a diagnosis, a positive result impacts screening decisions. Relatives can learn their own status through cascade testing, which checks family members for the same change.
Learn More About Pancreatic Cancer
Genetics influences pancreatic cancer risk through inherited changes passed in families and acquired changes that develop over time. Genes such as BRCA1 and BRCA2 link to higher inherited risk, and genetic testing with counseling helps people interpret their results. When results are available, doctors use them to guide screening, treatment planning, and family testing. To learn more about pancreatic cancer, contact a qualified gastroenterologist near you to schedule your appointment today.
