In tests on 67 chronic leukaemia sufferers, nearly a quarter were cured and 61 per cent left in partial remission.

After undergoing therapy, he achieved a partial remission.

He achieves the world's first partial remission of acute leukemia.

Immunotherapy has the potential to induce complete remissions or durable partial remissions in some patients, although it works in only about 10 to 15% of patients.