Causes and Risk Factors


What causes childhood cancer?
Very little is known. Unlike adult cancers, there is no clear evidence that they can be caused by environmental agents such as chemicals. In the past, some may have been caused by excessive exposure to x-rays. Nowadays doctors are aware of the possible hazards and take appropriate precautions.


Cancers themselves are not usually hereditary. (The only important exceptions to this are retinoblastoma, a type of eye cancer, and medullary thyroid cancer, which are often inherited).

 
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