When we hear the word cancer, many of us feel scared and overwhelmed. That's normal. But with the advancement of medical science, new treatments have come into the world that help us control cancer and live a better quality of life. Today, we are going to talk about a very special class of drugs that target and stop the growth of cancer cells. These are called Tyrosine Kinase Inhibitors, or TKIs for short.
Simply put, what are Tyrosine Kinase Inhibitors (TKIs)?
These are a type of medicine called "targeted therapies." Think of it this way: regular cancer medicine (chemotherapy) is like a bomb dropped in a war. It can kill enemy soldiers (cancer cells) as well as our own innocent people (healthy cells). But this targeted treatment called TKI is like a sniper. It looks exactly at the target and damages only the cancer cells. The damage to healthy cells is very minimal.
These drugs work by blocking enzymes inside cancer cells that help them grow and divide rapidly. These drugs may not cure cancer completely, but they can help control the cancer and put it into long-term remission , or they can help you live longer and healthier with the cancer.
How does this medicine work inside the body?
To understand this, let's take a look at how the cells in our body are controlled. Think of our cells dividing as being like turning on a light.
1. Growth factors: These are like the finger that flips the light switch. They are what give the cells the signal to "divide now."
2. Tyrosine kinases: These are the light switches. When you flick them on with your finger, they turn 'On', and cells begin to divide. When the need is gone, they turn 'Off' again.
In healthy cells, this switch works perfectly. It turns 'On' when needed, and turns 'Off' when the job is done.
But in some cancer cells, especially in a type of blood cancer called Chronic Myeloid Leukemia (CML) , this switch called 'Tyrosine kinase' is broken. It's always 'On'. That means the cells are constantly getting the signal to "divide, divide, divide." So these cancer cells divide uncontrollably, filling the bone marrow and stopping the production of healthy blood cells.
That's when TKI drugs come into play. What these drugs do is forcefully turn off that broken, always-on switch. Then the cancer cells lose the signal to divide, and their growth stops. Do you understand how specific that process is?
What types of cancer are TKI drugs used for?
These drugs are now used for many types of cancer. See the table below.
| Cancer Type | A simple explanation |
|---|---|
| HER2-positive breast cancer | A type of breast cancer that has an excess of a protein called HER2 on the surface of cells. |
| Chronic lymphocytic leukemia | A slow-growing blood cancer that affects a type of white blood cell. |
| Gastrointestinal stromal tumors | It is a rare type of cancer that occurs in the walls of the digestive system. |
| Kidney cancer | For cancers that start in the cells of the kidneys. |
| Lung cancer (Non-small cell lung cancer) | To treat the most common type of lung cancer. |
| Skin cancer (Melanoma) | A serious type of skin cancer that develops in the cells that give skin its color. |
The important thing is that not all TKI drugs work for all types of cancer. Your doctor will choose the right targeted drug for you based on the genetic makeup of your cancer.
Are there any side effects to these medications?
Yes. Like any medicine, this one can have side effects. But these vary greatly from person to person and depending on the type of medicine you take. Some people may experience only minor discomfort, while others may experience more severe ones.
Some of the commonly seen side effects are:
- Tiredness and fatigue: This is very common.
- Diarrhea: Bowel movement.
- Skin problems: Skin rashes, dryness, itching, etc. In rare cases , severe skin conditions such as Stevens-Johnson syndrome can occur.
- Nausea and vomiting
- High blood pressure (hypertension)
- Proteinuria
- Weight loss or gain
Important: Before you start this treatment, your doctor will clearly discuss the possible side effects of the medication you will be receiving. It is very important to inform your doctor immediately if you develop any new symptoms or discomfort during treatment.
What can we do to make treatment easier?
Cancer treatment is a challenging journey, both physically and mentally. There are a few things you can do to make this journey a little easier.
- The best thing for fatigue is rest: If you feel tired, understand that it is normal. Get as much rest as possible. It is also good to take a short nap during the day.
- Be careful about your diet: Some people lose weight due to loss of appetite. Others may gain weight. If you feel this way, seek help from a nutritionist . They can then create a diet plan that suits your situation.
- Plan your day: Treatment can change your daily life a lot. Try to keep things organized by marking your doctor's appointments and medication appointments on a calendar.
- Learn about Palliative Care: This is something that many people don't know about, but it's very important. Palliative care is a special type of care that, in addition to cancer treatment, helps you live more comfortably with your illness by controlling symptoms such as pain, nausea, fatigue, and side effects of treatment. Ask your doctor about this.
Over time, some cancer cells can become resistant to these TKI drugs and stop responding to treatment. This is called 'drug resistance'. At such times, your doctor may switch you to a different TKI drug or a different treatment regimen. Therefore, it is very important to maintain regular contact with your doctor during treatment.
Take-Home Message
- Tyrosine Kinase Inhibitors (TKIs) are a class of advanced drugs that target and block the signaling system involved in the growth of cancer cells.
- Rather than completely curing cancer, these help control the disease and help patients live a longer and better quality of life.
- This treatment is often given as a pill taken daily, and the treatment plan is determined by your doctor.
- Side effects are possible and vary from person to person. It is important to discuss any discomfort with your doctor immediately.
- TKI drugs are a major breakthrough in cancer treatment, bringing new hope to many patients.
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