Have you ever heard of a strange, but very rare type of leukemia that develops in the blood? Maybe you've heard of a friend who has it. Or maybe you've just heard about it and wondered about it. Today we're going to talk about one such rare, but very important leukemia. It's called Large Granular Lymphocytic Leukemia (LGL). The name may sound a bit long, but let's keep it simple.
What does LGL really mean?
Simply put, LGL is a type of leukemia that grows slowly in the body, chronic (meaning it lasts for a long time). It affects a special type of white blood cell in our blood. We call these cells lymphocytes . Did you know that lymphocytes are very important parts of our immune system. They are like soldiers in our army. They are the ones who fight germs like viruses that enter our body, and they are the ones who make antibodies that protect us from diseases.
So, in LGL, what happens is that these so-called lymphocyte cells, especially the two types of cells called Cytotoxic T cells or Natural Killer cells (NK cells), change abnormally for some reason and start dividing and multiplying uncontrollably. These abnormal cells are called LGL cells.
This condition, called LGL, usually grows very slowly. That's why it's called chronic leukemia. It's most common in people over the age of 60. Doctors can treat LGL. But sometimes the condition can come back, and it can be a long-term health problem.
There are two main types of LGL:
Two main types of this LGL condition have been identified. They are:
1. T-cell large granular lymphocytic leukemia (T-LGL)
2. Chronic lymphoproliferative disorder of NK cells (CLPD-NK)
In both cases, as mentioned earlier, what happens is that the T cells or NK cells become abnormal.
How does this situation affect our bodies?
You might be wondering what kind of effect this disease called LGL has on our bodies. Well, since this is a type of Chronic Lymphocytic Leukemia, those abnormal LGL cells go to the bone marrow and interfere with the production of normal blood cells there. It's like a bad plant coming in and taking over a good plant.
This can cause two main problems:
- Neutropenia : This is a decrease in the number of granulocytes , the most common type of white blood cell, in our body. When these cells are reduced, our body's ability to fight disease, or immunity, decreases. This increases the risk of frequent infections.
- Anemia : You may have heard of this. Anemia is when the body loses the required amount of healthy red blood cells. This condition can occur because LGL cells also affect the production of red blood cells. When anemia develops, you feel tired and extremely tired.
Who is most likely to get this disease?
LGL is actually a very rare disease. If you look around the world, this condition is reported in about one in a million people. That means that in a country like Sri Lanka, these patients may be very few. Most of the time, when this disease is diagnosed, patients are in their 60s.
What are the symptoms? How do we understand this?
Here's what's a little surprising. Some people with LGL can go for years without any symptoms . One study found that about a third of people with LGL had no symptoms at all when they were diagnosed. They only found out they had it when a blood test for another reason showed an abnormally low number of red blood cells or a low number of white blood cells called neutrophils.
However, there are some common signs that people who develop symptoms may notice:
- Extreme fatigue and tiredness : This is the most common symptom of LGL. Most often, this is due to the aforementioned anemia.
- Frequent fevers and recurring infections : Bacterial infections can cause fever. This is due to a weakened immune system.
- Splenomegaly: This is an enlargement of the spleen, an organ in our body. This can be caused by infections and some types of anemia.
Remember, just having these symptoms does not mean you have LGL. These can also be symptoms of many other diseases. Therefore, if you are experiencing something like this, the best thing to do is to see a doctor and get advice.
Are there other conditions associated with LGL?
Yes, many people with LGL have been found to have other autoimmune diseases . That is, conditions in which our body's own immune system attacks our own healthy cells. Among these, rheumatoid arthritis is the most common.
In addition, several other conditions may be associated with LGL:
- Anemia : We've talked about this before. Some people become severely anemic and have to get blood transfusions to maintain their red blood cell levels. Some people with LGL can also develop a type of anemia called hemolytic anemia . This is when red blood cell production is reduced, and the red blood cells that are already being produced are destroyed.
- Lymphocytosis : This is an increase in the number of white blood cells called lymphocytes in the blood. This increase in lymphocytes is usually seen in people with lymphocytic leukemias, lymphomas, or viral infections.
What is the real cause of LGL?
This is something that doctors still don't fully understand. The exact cause of LGL is not yet known. However, they believe that there is a link between this leukemia condition and the functioning of our immune system, autoimmune diseases, and other types of cancer.
- About 30% of people with LGL have other autoimmune diseases, such as rheumatoid arthritis.
- Another 25% to 30% may have another type of lymphoma or other type of cancer.
- Also, many people with LGL have changes in their genes. In particular, there are mutations in two genes called STAT3 and STAT5B . These two genes play important roles in cell immunity and the way cells divide and multiply.
How do doctors diagnose this disease?
Doctors mainly use blood tests and genetic analyses to diagnose LGL. Here are some of the tests that are commonly performed:
- Complete blood count (CBC) with differential : This counts all the types of cells in your blood, especially how many of each type of white blood cell you have.
- Peripheral blood smear : This involves looking at a blood sample under a microscope and counting the number of LGL cells in the blood.
- Flow cytometry : This is a laboratory test that is used to analyze the characteristics of cells. This test is often used to identify and classify types of leukemia.
- Immunophenotyping : This involves taking blood or tissue samples and examining them for specific markers on the surface of cells. These markers can be used to identify certain types of diseases.
- T-cell receptor (TCR) gene rearrangement analysis : This takes a sample of blood or bone marrow and looks for any problems with the genes that control how T-cells work.
- Genetic testing : You can also test for mutations in the previously mentioned STAT3 and STAT5B genes.
In addition to these tests, other tests may be done, such as bone marrow examinations, to rule out other conditions such as immunodeficiency , rheumatoid arthritis, myelodysplasia , and myeloid mutations . Immunoglobulin levels and monoclonal protein levels may also be checked.
How is LGL treated?
Let's say you have T-LGL or CLPD-NK leukemia, but you don't have any symptoms . In that case, your doctor may recommend a strategy called "watchful waiting." This involves continuously monitoring your health. Usually, you'll have blood tests every few months to see if symptoms develop.
For those with symptoms, immunosuppressive therapy and steroids may be given. Doctors may start one treatment after another, or they may start a low-intensity treatment. Because LGL is a rare disease, most people seek out a doctor who specializes in this disease.
Can't we reduce the incidence of this disease?
Unfortunately, no, we can't. Doctors still don't know exactly what causes it. So, it's hard to say how to prevent it. However, it has been found that people with autoimmune diseases are at a higher risk of developing this condition. So, if you have one of these autoimmune diseases, it's a good idea to ask your doctor if you should be concerned about LGL.
Is LGL a fatal disease?
In most cases, LGL is a chronic disease, not a sudden death . About 75% of people with T-LGL leukemia and CLPD-LGL leukemia survive for five years after diagnosis. However, about 10% of people with these types of leukemia die from serious infections that can occur as a complication of the leukemia. Therefore, it is very important to protect yourself from infections.
How do I take care of myself? How do I live with this condition?
If you have LGL, you may not have any symptoms. However, it is important to take care of your overall health, including getting regular checkups. Whether you have symptoms or not, these suggestions may help:
- Eat a healthy diet : Eat more lean meats, fish, fruits, vegetables, and whole grains.
- Exercise regularly : Choose an exercise that feels good and suits you.
- Sleep well : Adequate rest is very important.
- Manage stress : Do things that make you happy, meditate, do yoga.
- Protect your immune system : Ask your doctor about vaccinations and other things you can do to prevent infections. Even simple things like washing your hands with soap and staying away from crowded places can help.
Is it possible to live a normal life with this condition?
In general, people who are treated for LGL often live normal lives . They can live as long as someone without the condition. However, it is important to remember that some people with LGL may already have serious blood diseases that affect their quality of life.
When should I see a doctor?
If you develop symptoms that suggest your condition may be getting worse, you should definitely see your doctor. If you are already being treated for symptoms, you should also tell your doctor about any changes you notice in your body (for example, symptoms getting worse).
What are the important questions to ask the doctor?
Since LGL is such a rare disease, it's normal to have a lot of questions about it. Here are some questions that we hope will help you learn more about LGL:
- What type of LGL do I have?
- What are the treatments for this?
- Will I need more than one treatment?
- I feel very well now. Will I develop symptoms?
- I have other illnesses. Will LGL make them worse?
Never be afraid to ask questions like these. Your doctor is there to help you. They are committed to explaining everything in a way that you can understand.
Finally, things to remember
Large granular lymphocytic leukemia (LGL) is a rare blood cancer that affects your white blood cells. Even if you have this condition, you may not notice any changes in your body that could be symptoms of LGL. Sometimes, symptoms may not appear for years.
Doctors cannot completely cure this condition. However, there are treatments that can help control its symptoms. It is normal to feel shocked and scared when you hear that you have an incurable disease . Your doctors will understand why you feel that way.
They will be happy to explain to you what you can do to take care of your health now, and what to expect if symptoms develop. Knowing what to expect in the future will give you a lot of confidence and strength to live with LGL. So, talk to your doctor about all the questions you have. Get informed. That's the best thing you can do at a time like this.
` LGL leukemia, blood cancer, white blood cells, lymphocytes, neutropenia, anemia, immune system
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