Immunotherapy is an experimental-stage therapy which uses body’s own immune system to fight cancer. Two approaches are being pursued by researchers.
One approach has been to draw blood from the patient and re-engineer genetically immune system's T-cells present in the blood. These are then infused back into the same person's bloodstream to kill cancer cells. This is a personalized treatment for each patient.
Another approach has been to use mass-produced drugs to block a mechanism called a checkpoint. Cancer cells use the checkpount mechanism to shut down the immune system. When the drugs block the checkpoint, immune system is free to attack cancer cells. There is no individual personalisation involved in this approach.
Clinics offering variations of immunotherapy in India are listed in Resources below. However, it must be noted that these clinics have no authorization from medical field's statutory and regulatory bodies.