A new study shows that lower radiation levels during radiotherapy may trigger the body's immune system to 'seek and destroy' cancer cells.
This new technique, which may change the way cancer is treated, causes the immune system to recognise the genetic fingerprint of cancer cells and destroy them.
One patient who had cancer in her lungs, liver and bones was tumour-free within six months of undergoing the treatment.
The technique in question is using conventional radiotherapy but at a lower strength, and it has proved particularly successul in treating the aggressive form of breast cancer, triple negative breast cancer (TNBC).
Explaining the process, expert breast surgeon Professor Mokbel, of the London Breast Institute, said:
"The radiation kills cancer cells and as it does so, cancer DNA is released."
"That stimulates immune cells to respond to what they see as a foreign body."
Prof Mokbel cautioned it was very early days and that the success of the method could not be proven by a study in just a few dozen patients.
But he said the results so far were "very, very promising".