It's normal to feel a lot of stress and anxiety when doctors tell you that you have cancer. "What's going to happen now?" "Has this spread throughout your body?" Many questions probably come to mind. At such a time, a 'sentinel node biopsy' or 'sentinel lymph node biopsy' is an important surgical test that is done to find out exactly how far the cancer has spread in the body and what its condition (stage) is. Today, we'll talk about this in a simple way that you can understand, as if you were talking to a close friend.
What is a 'Sentinel Node Biopsy'? What does it involve?
Simply put, this is a surgical procedure for cancer patients. In this procedure, your doctor removes one or more lymph nodes called "sentinel nodes" and sends them to a lab to check for cancer cells. These results are used to determine whether the cancer has spread beyond the primary tumor.
Now you're probably wondering what these 'lymph nodes' are, what 'sentinel nodes' are.
Lymph Nodes and Their Role
Imagine that your body has a network of little checkpoints. That’s what lymph nodes are like. These are small, bean-shaped glands. They filter body fluids (saliva) and protect the body from disease. We have about 600 of these lymph nodes throughout our bodies! Like clever sentinels, they catch and help stop the spread of harmful substances, including viruses and bacteria, and even cancer cells.
So what are 'Sentinel Nodes'?
Sentinel nodes are the lymph nodes that are most likely to travel to if cancer cells start to spread from a tumor. In other words, these are the first checkpoints for cancer. That's why doctors check these sentinel nodes to see if the cancer has started to spread.
When is this 'sentinel node biopsy' done?
Doctors mainly use this test to determine the stage of cancer in breast cancer and melanoma , a type of skin cancer. This means finding out if the cancer has spread and how far it has spread. In addition, it can also help determine the stage of penile cancer or uterine cancer or endometrial cancer.
Researchers and doctors are further investigating whether this method can be used for other types of cancer, for example:
- Cervical Cancer
- Colorectal (Colon) Cancer
- Esophageal Cancer
- Non-small cell lung cancer (`Non-small cell lung cancer`)
- Thyroid Cancer
- Vulvar cancer
Most often, doctors perform this biopsy during surgery to remove the cancerous tumor. However, sometimes this test can be done before or after the tumor is removed.
How is this 'sentinel node biopsy' test performed?
Before doing this ``sentinel lymph node biopsy,'' a doctor will inject a special dye around your cancer. The hope is that this will help pinpoint the main lymph nodes that the cancer will drain into if it spreads. That is, if the cancer spreads, these are the lymph nodes that will go to first.
Then, the surgeon finds your sentinel nodes, removes them, and sends them to a lab. There, another specialist (a pathologist) takes these lymph nodes and examines them under a microscope to see if they contain cancer cells.
How should you prepare before this surgery?
Your doctor will advise you on how to prepare for this. This can usually include things like:
- Fasting: How long to stop eating and drinking before surgery, and what not to eat or drink.
- Medications: You may be asked to temporarily stop taking any medications, vitamins, herbs, or other supplements that you normally take.
Also, it is very important to arrange for someone to take you home on the day of surgery.
What happens during surgery?
Before or during surgery, you may be given an injection of a safe radioactive substance (tracer) and/or a special dye. These travel in the same direction as the fluid that drains from your tumor. This 'tracer' helps the surgeon find the location of your sentinel lymph nodes.
You will be given general anesthesia . This means that you will be put to sleep with an injection into a vein in your arm (an IV). So you will not feel any pain. After you are asleep, the medical team will:
- Finding sentinel lymph nodes: If you have been given a `tracer`, a device called a `gamma detector` is used to find the sentinel node. Sometimes a blue dye is injected near the tumor. This turns the sentinel nodes blue. Or, a `fluorescent` dye may be used that glows under a special light. Often, doctors use both this dye and the `tracer`.
- Lymph node removal: The doctor makes a small cut (incision) in the skin and removes one or more sentinel nodes.
- Stitching the incision: Then, the incision is closed with stitches.
Sentinel nodes removed in this way are sent to a laboratory, where a pathologist – a specialist in diagnosing diseases through laboratory tests – examines them for cancer cells.
How many lymph nodes are usually removed?
This can vary from person to person. Your doctor will remove as many sentinel nodes as needed to accurately identify cancer cells. Often, more than one is removed. But there are different opinions about exactly how many. Some studies say that removing as few as three sentinel nodes is enough to detect cancer. Other research suggests that up to five may be needed to make an accurate diagnosis. So, this number will depend on your specific situation.
What can you expect after surgery?
Although most people can go home the same day, you may need to stay in the hospital overnight. Follow your doctor's instructions about when it's safe to go home.
During the recovery period, you can generally expect the following:
- Pain or stiffness at the incision site.
- Tingling and numbness (this is what you feel when your nerves are healing).
- Blue or green urine or stool due to the dye.
- The skin around the incision site may turn blue (due to the dye).
- A feeling of tightness under the skin due to scar tissue formation.
- If you have had sentinel nodes removed from your armpit, you may feel a stiffness in your arm.
Before you leave the hospital, find out exactly how to care for your incision and what complications to watch out for. Also ask when it's safe to resume your normal activities. The recovery time from this surgery varies from person to person. But most people will need to avoid activities like running, exercising, and lifting weights for a few weeks.
Are there any risks to this surgery?
Sentinel node biopsy is generally a safe procedure. However, as with any surgical procedure, there are some risks. Possible side effects and complications include:
- Problems with the incision: Bleeding, bruising, swelling, and pain may occur at the incision site. The incision may also become infected. Signs of an infection include redness, swelling, and fever.
- Allergic reaction: Very rarely, some people may have an allergic reaction to the blue dye used to find the sentinel node.
- Lymphedema: When lymph nodes are removed, the lymph fluid that normally flows through them can become trapped in one place, causing swelling and pain. This condition, called lymphedema, is a rare complication. It usually occurs only if a large number of lymph nodes are removed, not just a few sentinel nodes. Doctors usually leave enough lymph nodes to allow the lymph fluid to continue flowing.
- Axillary Web Syndrome (AWS): This is also called 'cording'. If lymph nodes are removed from under the armpit, sometimes you can see hard, rope-like structures under the skin on the inside of the arm. This is also rare. These 'cords' can develop days, weeks, or even months after surgery.
If you notice any symptoms of any of these complications, you should inform your doctor immediately.
What does the test report look like? What does it say?
The results come in either 'positive' or 'negative'.
- A negative result means that there is no sign of cancer in your sentinel nodes. This means that the cancer is very unlikely to have spread to other lymph nodes. This is really good news!
- A positive result means that the biopsy has found cancer cells in one or more of your lymph nodes.
If your results are positive, your doctor may recommend removing more lymph nodes (not just the sentinel nodes) to see if the cancer has spread. He or she may also recommend additional treatments. Your doctor will advise you on what to do next, based on your specific diagnosis.
How long does it take to know the results?
Sometimes you can get the results the same day. Or it can take a few weeks. If your test results are positive the same day, your doctor may remove more lymph nodes for testing right away. Then you won't have to go back for surgery. If your surgeon needs to discuss the results with your cancer treatment team, it may take a little longer to get the results.
When should you see a doctor?
If you have any of these symptoms of a complication, call your doctor immediately:
- Fever.
- Swelling, warmth, or redness at the incision site.
- Bleeding from the cut.
- Pain that does not subside even after taking painkillers.
How painful is this 'sentinel node biopsy'?
During the surgery, you will not feel any pain because you will be asleep. Most people can manage the pain for a few days afterward with over-the-counter painkillers (`over-the-counter medicines`) and ice the wound. Rarely, someone may need a prescription painkiller. Talk to your doctor about medications to help with the pain while the incision heals.
Finally, the most important thing you need to remember...
A sentinel node biopsy can provide very important information about how far your cancer has spread. This surgery is low-risk, and most people recover quickly.
If there are no cancer cells in your sentinel nodes, that means the cancer hasn't spread beyond the tumor. That's a really good sign.
Even if the results are positive, it gives your doctor important information to plan the most effective treatment for you.
So, don't be afraid of this. Talk to your doctor about it carefully and ask any questions you may have. I wish you a speedy recovery!
` Sentinel Node Biopsy, Sentinel Node Biopsy, Cancer, Lymph Nodes, Cancer Spread, Cancer Surgery, Cancer Stage
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