India, March 14 -- Imagine your body could be taught to fight cancer the way sniffer dogs are trained to detect explosives. Normally, the immune system does this job. But when it fails, is when cancer happens. This is a clever enemy. It disguises itself as part of the body, slipping past the immune defences and goes unnoticed. Now, CAR T-cell therapy is like fitting the immune system with high-tech goggles so it can spot the enemy. Doctors take a few of your immune cells, reprogram them in a lab to recognise cancer, and send them back into your bloodstream.

These newly trained cells now act like heat-seeking missiles, tracking down and destroying only cancer cells. Unlike chemotherapy, which attacks everything in its path, this therapy t...