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Another, called zoliflodacin, has also shown promise in phase 3 clinical trials.

Some 3,000 women a year could benefit from capivasertib after a clinical trial showed it can slow progression of the disease, and shrink tumours in a quarter of people.

They aim to carry out a total of 15 as part of a clinical trial.

Ms Knowles' consultant at Blackpool Victoria Hospital had given her three options – try to get a transplant despite her relapse, join a clinical trial or "do nothing".

Researchers were planning to take blood samples of swimmers in the next stage of the trials and interview participants about their experience before any clinical trials begin.