Why do so many kids and teens get cancer? My daughter knows 2 kids at her school with it and one other friend who is a survivor. Why so common?

Wish we knew:( Most expert however seem to believe that besides genetics, toxic contamination of environment may be the contributing factor for the seeming uptake in cancer prevalence all across the population. Our ability to diagnose them more readily than before would be an added factor, just like Autism, which has become much prevalent in recent years.