It is difficult to predict how cancer acts and where it spreads. It depends on it's virulence and varies between patients. Some Drs are trying to see the cup half full rather than half empty. I wrote about the issue of Head and Neck Cancer Spread on my blog at: http://dribrook.blogspot.com/p/general-medical-and-dental-issues.html
I hope it helps you.
Itzhak Brook MD