"The results are holding up very nicely." Cancer researcher Michel Sadelain is admirably understated about the success of a treatment developed in his lab at the Memorial Sloan-Kettering Cancer Center in New York. In March, he announced that five people with a type of blood cancer called acute lymphoblastic leukaemia (ALL) were in remission following treatment with genetically engineered immune cells from their own blood. One person's tumours disappeared in just eight days.
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