Is Cancer Genetic? Facts For Caregivers
Caring for a care recipient who’s been diagnosed with cancer can bring up a lot of questions; not just about treatment and care, but about the future. One common question cancer caregivers have is: “Is cancer genetic?” And if so, what does that mean?
Understanding how genetics plays a role in developing cancer can help caregivers make educated decisions about preventing cancer, noticing signs and symptoms early, and even reducing unnecessary worry.
This article will describe:
- What is cancer
- The role that genetics plays in cancer
- How to lower your cancer risk
- The importance of cancer screening
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What Is Cancer?
There are more than 200 types of cancer. But how does cancer develop? Cancer cells have genetic changes or gene mutations that cause them to divide, grow, and clump together out of control. Over time, these abnormal cells can interfere with how organs function, leading to different symptoms depending on the cancer type. For example, breast cancer and colorectal cancer develop in different tissues and may have different risks, treatment options, and outcomes.
Genetic Involvement In Cancer
Is Cancer Genetic?
Only about 5-10% of cancers are considered hereditary cancers. That means that the majority of people who are developing cancer didn’t inherit it directly from a parent or family member.
A hereditary cancer occurs when a person is born with a cancer gene that’s been passed down from their parent. However, most cancers are caused by acquired mutations, meaning that cancer cell mutations are due to factors that occur across a person’s lifetime, such as environmental exposures or their lifestyle.
Inherited Cancers
When cancer runs in families, it may be because of inherited cancer genes or inherited mutations that are passed down from parent to child. Some families have what’s known as family cancer syndromes, where multiple relatives develop similar cancers or are diagnosed at younger-than-expected ages.
In these cases, a person may have a genetic predisposition, meaning they have a higher cancer risk; however, it’s not a guarantee that cancer will occur. While genetics can play a role, cancer is usually caused by a combination of factors rather than a single cause. Genetic tests can help identify inherited cancer genes or inherited mutations or genetic mutations and show which family members may be at higher risk.
Cancer Screening
Regular cancer screening can be one of the most effective ways to detect cancer early. While cancer screening doesn’t prevent cancer, it can significantly improve a person’s survival by catching changes in the body before symptoms appear. This can make it more likely for cancer to be treatable.
Recommendations for when you should complete a cancer screening will depend on your personal health history, family history, sex, and age. For example, someone with a family history of breast cancer or colorectal cancer may be advised to complete cancer screening earlier or more often than the general population.
Genetic Testing
People who have a strong family history of cancer or features suggesting family cancer syndrome may choose to complete genetic tests. Genetic tests look for a gene mutation or genetic mutation changes that are known to put a person at increased risk of cancer.
Genetic tests usually involve taking a blood or saliva sample. While they don’t diagnose cancer, they can show whether you carry a gene mutation linked to certain cancers. A genetic counselor can then help you understand your risk for cancer compared to the general population and provide you with recommendations on how to proceed.
Lowering Your Cancer Risk
It’s important to remember that an inherited mutation or cancer genetics are only one part of the picture. Families don’t only share DNA; they also often share a similar lifestyle. For example, the food they eat, the amount of physical activity they participate in, their stress levels, and the environment they live in. The good news is that these are all risks that can be modified to reduce your cancer risk, even if you have a family history or genetic predisposition to cancer.
Here are some steps you can take to lower your cancer risk:
- Eating a balanced diet rich in fruits, vegetables, and whole grains
- Staying physically active
- Avoiding tobacco and limiting alcohol
- Protecting your skin from UV exposure
- Managing chronic stress and prioritizing sleep
Main Takeaways
For caregivers, understanding the role genetics plays in cancer can bring clarity during an uncertain time. Knowledge empowers you to take proactive steps for yourself and your family, while continuing to support your care recipient with confidence and care.
Remember:
- Cancer develops when cells grow uncontrollably due to changes in a gene.
- Most cancers are caused by acquired mutations, not inherited ones.
- Only about 5–10% of cancers are considered hereditary cancers.
- Inherited cancers may involve specific inherited cancer genes and sometimes occur as part of a family cancer syndrome.
- A genetic predisposition increases cancer risk, but it does not guarantee cancer will occur.
- Regular cancer screening improves early detection and treatment outcomes.
- Genetic testing and genetic counseling can help clarify risk in families with strong cancer histories.
- Lifestyle changes can reduce risk, even when genetics play a role.
References
- Canadian Cancer Society. (n.d.-a). Check your family history. Canadian Cancer Society.
- Canadian Cancer Society. (n.d.-b). Genes and cancer. Canadian Cancer Society.
- Canadian Cancer Society. (n.d.-c). What is cancer? Canadian Cancer Society.
