The causes of brain cancer are unknown. However, certain factors increase a person's risk of developing it. Compare your answers with mine. Maybe we'll find a common link.
Being male. This doesn't work for me because I'm female.
Being caucasian. Yes, I am white.
Being younger than 8 or older than 70. Doesn't apply to me--I was diagnosed at 29.
Family history. Grandfather did have a partial stroke and found he had a brain tumor at 88, but the pathology was never determined. (And this was learned about two years after my diagnosis.)
Radiation. Doesn't apply.
Formaldehyde. Doesn't apply.
Vinyl chloride. Doesn't apply.
Acrylonitrile. Doesn't apply.
Then there are the theorized causes that haven't been proven.
Cell phones. I got my first cell phone in 2005. I was a later bloomer.
Head injury. In eighth grade I was hit by a truck while in a crosswalk, lost consciousness and sustained a concussion (along with other injuries).
Using these factors, we can say I possibly have brain cancer because I am a white person who sustained a head injury, and now uses a cell phone, with a grandfather who also had a brain tumor of unknown origin.