Rachel Simpson , next few weeks , diagnosed with one-in-a-million genetic condition . Has mutation of the GATA2 gene , making her vulnerable to infection . Can also make blood cells abnormal , leading to leukaemia . The other members of her family will find out their fate in 15 .
Rachel Simpson , 15 , diagnosed with one-in-a-million genetic condition . Has mutation of the GATA2 gene , making her vulnerable to infection . Can also make blood cells abnormal , leading to leukaemia . The other members of her family will find out their fate in next few weeks .