Great article in Reader's Digest, February,2018 issue on subject of Immunotherapy.

The article explains how this process works. Basically, T cells, the immune cells that attack bacteria, viruses and cancer cells are generally not strong enough to wipe out cancer in the body. A team led by Doctor Rosenberg was the first to remove T cells from patients with cancer, multiply them in the lab and then re-inject them into the patient.

Basically, the T cells are now , hopefully, strong enough to attack the cancer cells and destroy them.
The process does not always work, but it is a way of our own immune system to become strong enough to attack the cancer cells and destroy them.

Another doctor in Israel, an Immunologist, at the Weizmann Institute of Science, thought he could use a recently developed gene therapy technique to make T cells strong enough to better and more effective cancer fighters. By engineering T cells to carry a chain of amino acids called chimeric antigen receptors, (CARS), which seek out cells which may be cancerous.

When receptors on CAR Ts find cancer cells, they latch onto them, that connection tells them to multipy and multiply and ultimately and hopefully, kill the cancer cells.

There is more in this fascinating article. Go to Readers Digest and read the February 2018, beginning on page 54