Cancer and Immunotherapy

A patient’s body has been invaded by cancer. In the past, treatment meant chemotherapy or radiation, which would destroy healthy cells along with cancer cells. Now, doctors want the body itself to fight and defeat cancer.
This new approach is called immunotherapy—a “smart” treatment method.

What does immunotherapy mean?

Our bodies have a natural defense system—the immune system. For example, the way the body reacts to a cold or virus is the work of the immune system. This system typically fights against viruses, bacteria, or other harmful invaders. But cancer cells are clever—they can hide themselves from the body’s defense system.

The job of immunotherapy is to “train” the body’s immune system so that it can recognize cancer cells and attack or destroy them.

Three important immunotherapy methods (in simple terms)

1. Immune Checkpoint Inhibitor (ICI):

Imagine your body’s soldiers (T-cells) want to attack cancer cells, but the cancer sends a “stop signal” that makes the soldiers halt.

ICI therapy blocks this “stop signal.” For example, PD-1 or CTLA-4 are proteins that reduce the effectiveness of T-cells. This therapy blocks the action of these proteins and reactivates the T-cells. As a result, T-cells become active again and can attack cancer cells.

2. Cancer Vaccines:

Just as we take vaccines against the coronavirus, some vaccines are being developed that show a sample of the cancer cell to the body. This way, if the body encounters cancer cells in the future, it can recognize and attack them immediately.

Example: Now, mRNA vaccines are being developed based on a patient’s specific cancer genes—completely personalized. This marks a new era in cancer prevention.

3. CAR-T Cell Therapy:

In this method, T-cells are collected from the patient’s blood. Then, in the laboratory, they are genetically modified so they can recognize and attack cancer cells.

These modified cells are then returned to the patient’s body—they act like superhero soldiers. CAR-T stands for Chimeric Antigen Receptor T-cell. This is a technology where a special type of receptor is added to the patient’s T-cells so they can identify specific markers on cancer cells and destroy them.

What are the challenges of these technologies?

• They do not work for every patient. This is because cancer is highly varied, and some cancer cells can hide themselves very well.
• Very expensive. For example, CAR-T therapy involves collecting, modifying, and returning the cells to the patient—a time-consuming and costly process.
• Can cause complex reactions in the body. Because if the immune system gets over-activated, healthy cells in the body may also become targets.

What does the future hold?

• Researchers are now developing new types of vaccines using mRNA or viruses to help identify cancer cells.
• By using AI and machine learning to analyze the patient’s genetic information, cancer cell types, and responses, researchers aim to determine which treatment method will work best for each patient.
• The CAR technology is now being used not just on T-cells, but also on other immune cells such as NK cells or macrophages, which can be prepared and given directly to patients (off-the-shelf therapy).

Conclusion:

Immunotherapy is a treatment that does not attack cancer from the outside, but empowers the body from within. While it may not be suitable for all patients right now, with continued research, it will likely become one of the main treatment methods for cancer in the future.

It is important for our society to be informed and understand these new treatments, so that patients and their families can be aware and prepared for treatment options.