article_snippet.sent: Rachel Simpson, 15, was diagnosed last year with a one-in-a-million genetic condition which doctors say will eventually give her cancer if untreated.
article_snippet.sent: Rachel Simpson, 15, has a one-in-a-million genetic condition which doctors say will eventually give her cancer if untreated.
article_snippet.sent: Doctors say the mutation's frequency is less than one in a million - and one member of a family has a 50/50 per cent chance of passing it on .
article_snippet.sent: my son Steven said: 'This mutation's frequency is less than one in a million, it's a very rare genetic disorder. '
article_snippet.sent: One member of a family has a 50/50 chance of passing it on, but it can also be the first time in a family that the genetic mutation occurs. '
article_snippet.sent: If we assume one of the parents has it, then there's a significant possibility that Rachel brothers and sisters have the defect, although her brothers and sisters may not have symptoms.'
highlights_snippet.sent: Rachel Simpson, 15, diagnosed with one-in-a-million genetic condition .
  