Particular skin tumor type and immune system allows for T cell cloning treatment

From a sample of the man's white blood cells, they were able to select CD4+ T cells which had been specifically primed to attack a chemical found on the surface of melanoma cells.

These were then multiplied in the laboratory, and put back in their billions to see if they could mount an effective attack on the tumours.

Two months later, scans showed the tumours had disappeared, and after two years, the man remained disease-free.

The new cells persisted in the body for months after the treatment.