Genetic Testing for Cancer Risk? Let's talk about this!

We all have a little fear of the word cancer, don't we? Especially when someone in the family has cancer, there are times when we think, "Oh, is there a chance that I will get it too?" Is there really a way to know in advance if we have a hereditary risk of developing cancer? Yes, that's what genetic testing is for. So, let's talk about this in detail, very simply, today.

What is this genetic testing to determine cancer risk?

Simply put, this is done by checking for any changes in the genes in your `DNA`, that is, `Genetic Mutations`. Imagine, the cells in our body have all the instructions for how they should behave, how they should grow, and when they should die, all contained within these genes. It's like a code.

When cancer develops, changes (mutations) in certain genes cause healthy cells to become cancer cells and start to grow uncontrollably. These cells combine to form tumors, which can sometimes spread throughout the body.

The important thing is that not all genetic mutations that cause cancer are inherited. Most of the time, these are new mutations that develop during life. However, about 5% to 10% of all cancers can be caused by genetic mutations that are inherited from either your mother or your father. This genetic test looks for such inherited mutations. Usually, a sample of your blood or saliva is used for this.

Remember, if this test finds a genetic mutation, it does not mean that you will develop cancer. It only means that you are at slightly higher risk of developing cancer than others . A genetic counselor is the best person to advise you about the impact these results may have on your health.

What cancers can be caused by these hereditary mutations?

Genetic mutations passed down through generations can cause various types of cancer. Here are some of the most common types of cancer:

• Breast cancer
• Colon cancer
• Kidney cancer
• Ovarian cancer
• Pancreatic cancer
• Prostate cancer
• Stomach cancer
• Thyroid cancer
• Uterine cancer (especially `(Endometrial cancer)`)

However, these genetic tests cannot directly detect cancer. They look for specific genetic mutations that can lead to cancer. Scientists have so far identified more than 400 genes linked to hereditary cancer. These can be divided into three main groups:

1. Tumor suppressor genes: These genes are like the brakes on a car. They control the growth of cancer cells. However, if these genes become mutated, cancer cells start to grow uncontrollably. The BRCA genes and the P53 genes are good examples of this.

2. Proto-oncogenes: These genes normally help cells grow at a certain rate. However, if they mutate, they become oncogenes, which accelerate the growth of cancer. Most of the time, these oncogenes are acquired during life, but some can be inherited.

3. DNA repair genes: When these genes work properly, they repair the mistakes in DNA that can cause cancer. But if these genes are mutated, the repair doesn't happen properly.

In what cases should this type of genetic test be performed?

A doctor may suggest you undergo this type of genetic testing if they think you may have a hereditary risk of cancer based on your personal medical history or your family's medical history.

Things to consider from your side:

If any of the following apply to you, you should consider genetic testing:

• If you have had several different types of cancer .
• If you were diagnosed with cancer at a very young age .
• If you have a type of cancer that is not common in people your age or your gender.
• If you have cancer in both paired organs in your body (for example, both kidneys, both breasts).
• If you have symptoms associated with certain inherited cancer syndromes (for example, people with Neurofibromatosis Type 1 also develop non-cancerous tumors called Neurofibromas).
• If you belong to a certain race or ethnic group and know that they have a higher incidence of hereditary cancer syndromes, and if you have additional risk factors.

Things to consider from your family's perspective:

If your family history includes any of the following, you may want to consider genetic testing:

• If several family members have the same type of cancer .
• If several family members have developed cancer at a young age .
• If several relatives on one side of your family (either your mother's or father's side) have had the same type of cancer.
• If family members have already been diagnosed with a genetic mutation linked to hereditary cancer .

When it comes to cancer risk, it can be a bit confusing to know whose family history is most important. Usually, doctors look at whether your first-degree relatives — that is, your mother, father, siblings, children — have had cancer. But sometimes, they may suggest testing even more distant relatives if they have a history of cancer.

If you are unsure whether this genetic test would be beneficial for you, be sure to talk to a doctor or a genetic counselor.

How is this genetic test done? What are the methods?

This test takes one or more of your genes and looks for mutations linked to hereditary cancer. There are several main methods for this:

• Single mutation test: This tests for a single gene mutation at a specific location. This is usually done to see if you have a specific gene mutation if someone in your family has already been found to have it.
• Single gene testing: This tests the entire DNA sequence of one specific gene.
• Panel tests: These tests look for mutations in multiple genes at once. In September 2023, the US Food and Drug Administration (FDA) approved a test that can detect the most common inherited genetic mutations (about 47 genes) in a single blood sample.

What to expect before the test? What is `Genetic Counseling`?

The first step in genetic testing for cancer risk is genetic counseling . Trained genetic counselors will usually talk to you about:

• Whether or not it's appropriate for you to undergo genetic testing.
• Which test is best for you and how to do it .
• What are the possible advantages and disadvantages of genetic testing?
• What impact the test results may have on your health .
• How much does the test cost (including whether it will be covered by insurance).
• How your results might affect you and your family .

This advice is very important, because it will greatly help you make an informed decision.

What happens during the test? Let's learn about the test that can be done from home.

In a genetic test for cancer, doctors usually take a sample of your blood or saliva and send it to a laboratory. There, technicians look for changes in your genes. They then send the test results to your doctor.

Nowadays, there are also ``at-home tests`` that allow you to take a saliva sample from home and send it to a lab for genetic testing. However, they don't always give a complete and accurate picture of the relationship between your genes and cancer risk. Also, your doctor is bound by laws (like ``HIPAA``) to protect the confidentiality of your medical information. However, those laws don't apply to companies that sell at-home tests. This means that the security of your information may be at stake.

That's why it's so important to talk to a doctor or genetic counselor to find out if you need genetic testing, and if so, what kind of testing you need.

How long does it take to get the results after the test? What kind of results can I expect?

Most people get their test results within two to three weeks . While it may take a short time to donate blood, it can take days or weeks for lab technicians to accurately perform this analysis.

The results of a genetic test for cancer risk fall into three main categories:

• Positive: The test has found a genetic mutation linked to a hereditary cancer. This means you have an increased risk of developing that cancer.
• Negative: The test did not find a mutation linked to hereditary cancer. A "true negative" result means that someone in your family has a mutation that has already been identified, but you do not have it.
• Variant of Uncertain Significance (VUS): A mutation has been found in the test, but it is not yet known whether it increases the risk of cancer. It could be a normal, benign change, or it could be a mutation that scientists have not yet identified that is linked to cancer.

What do you do after you get the results? What are the next steps?

A genetic counselor will talk to you about your test results in detail. If your results are positive , you may talk about things like:

• Changes to your care plan ; for example, what additional tests (`screenings`) you need to have to catch cancer early, and what you can do to reduce your risk of cancer.
• About family planning ; that is, how likely is it that your child will inherit this genetic mutation?
• What impact do these results have on your blood relatives , and what steps should they take based on these results?

If your results are negative or VUS , you may need to have more frequent medical checkups or additional tests. For example, if new research finds a link between a certain VUS and hereditary cancer, your doctor may notify you.

What happens next will depend on your health history and test results, so it's important to follow your doctor's instructions.

What are the benefits of genetic testing for cancer risk?

These genetic tests can reliably detect inherited genetic mutations that may increase your risk of cancer. Here are some of the benefits you will receive:

• Anxiety or fear of the unknown can be reduced .
• You will receive information that you can use to reduce your cancer risk .
• Your doctor will receive information that will help him catch cancer early .
• This information can be important when you are making decisions about having children .
• This will help you understand how genetic influences may affect the health of other members of your family .

So aren't there any disadvantages to these tests?

Genetic testing like this can cause emotional distress (such as anxiety and guilt) and can affect family relationships . For example, finding out that a genetic mutation runs in your family can feel like a burden that is difficult to bear.

Talking to a genetic counselor can be a great way to deal with these feelings. It can also help you talk more effectively with other family members about the steps they need to take to assess their health risks.

In a way, genetic testing for cancer can be a double-edged sword. Knowing that you have a genetic mutation linked to cancer can empower you to make decisions that will help reduce your risk of cancer. It can also help your doctors tailor your care plan to catch cancer early. However, these tests can also affect family relationships and cause anxiety, fear, and stress.

Genetic counselors understand how these genetic tests can affect your life and family relationships, which is why it's so important to talk to a specialist before and after the test.

The most important things to remember from what we have discussed (Take-Home Message)

Okay, so here are some important things to keep in mind from the things we talked about today:

• Genetic testing for cancer risk helps determine whether you have a hereditary risk of cancer .
• This cannot detect cancer, but it can give an idea of ​​the risk.
• Even if a test result is ``positive,'' it does not necessarily mean that cancer will develop, only that the risk is higher.
• Genetic Counseling is a very important part of this process. Talking to a counselor before and after the test can provide you with great comfort and guidance.
• Whether or not to undergo this test is a personal decision. Make a well -informed, well-considered decision.
• If you have any more questions about this, don't be afraid to talk to your doctor.

Remember, knowledge is power. Being aware of your health and your risks will give you great strength to stay healthy!

` Cancer, Genetic Testing, Cancer Risk, Heredity, DNA, Genetic Mutations, Genetic Counseling