WebMD Answers
Doctors don't know exactly what causes most cases of childhood leukemia. But certain factors may increase the chances of getting it. Keep in mind, though, that having a risk factor does not necessarily mean a child will get leukemia. In fact, most children with leukemia don't have any known risk factors.
The risk for childhood leukemia increases if your child has:
An inherited disorder such as Li-Fraumeni syndrome, Downsyndrome, or Klinefelter syndrome
An inherited immune system problem such as ataxia telangiectasia
A brother or sister with leukemia, especially an identical twin
A history of being exposed to high levels of radiation, chemotherapy, or chemicals such as benzene (a solvent)
A history of immune system suppression, such as for an organ transplant
Although the risk is small, doctors advise that children with known risk factors have regular checkups to spot any problems early.
This answer should not be considered medical advice...
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