With the ongoing discussion on Blood Cancer cure in Vietnam by CAR-T therapy. Let's take a deep dive into what CAR-T therapy is
CAR-T therapy (Chimeric Antigen Receptor T-cell therapy) is an advanced form of immunotherapy used primarily to treat certain blood cancers, like lymphomas and leukemias. It involves genetically modifying a patient's own T cells to better recognize and destroy cancer cells.
Here's step-by-step explanation of how CAR-T therapy works:
1. T-cell collection (Leukapheresis)
Blood is drawn from the patient, and T cells are separated out using a machine, while the rest of the blood is returned to the body.
2. Reprogramming the T cells in the lab
The collected T cells are genetically modified by inserting a gene that codes for the chimeric antigen receptor (CAR). This receptor is engineered to recognize specific proteins (antigens) on the surface of cancer cells.
3. Expansion (growing millions of CAR-T cells)
The modified CAR-T cells are cultured and multiplied in the laboratory to produce a large number of active cells.
4. Patient preparation (often conditioning chemotherapy)
Before infusion, the patient usually receives lymphodepleting chemotherapy to make space for the new CAR-T cells and help them work better.
5. Infusion of CAR-T cells
The engineered CAR-T cells are infused back into the patient's bloodstream, where they multiply further and seek out cancer cells.
6. Attack on cancer cells
The CAR on the T cells binds to antigens on cancer cells (e.g., CD19 in many blood cancers), activating the CAR-T cells to kill the cancer cells directly.
The therapy turns the patient's immune system into a targeted "living drug" that can persist and provide long-term protection in many cases.
While highly effective for some patients, CAR-T therapy can cause serious side effects (like cytokine release syndrome), so it's typically done in specialized centres.