Can my laptop give me testicular cancer?

I like to sit in bed, with my laptop on...my lap (duh!). I spend 8-12 hours a day like this. (I work out of my home.) I'm concerned because I know that overusing cell phones has been found to cause brain tumors. Am I in danger? If so, is there a product (like a lead-lined mat?) that will prevent my 'boys' from being harmed?