What type(s) of cancer are common in young children?

I know it's not a pleasant subject, but it's for a book I'm writing, and I want it to be medically correct. If possible, I'd also like to know the symptoms, treatment, recovery rate, and things like that. I really don't want to offend or sadden anyone with this question, I know it's a very serious topic, but I want to be able to show cancer patients respect by getting the facts correct in my story. Thank you so much for your help.