Hi,my one of my best friends has just been diagnosed with non-hodgkins 2nd stage cancer. He is only fifteen and they just found out it has spread to his bones. He just started chemotherapy. I dont really know to much about hte disease but I was wondering if any one knew anything about it?? Also there are 4 other kids in our county that have this exact same disease and they are all about he same age! I was just wondering what kind of environmetnal tihngs can cause cancer??