Looking at the date on this thread....it's probably a case of better late than never.
I too was diagnosed with stage 4 tongue cancer in 2015...however, and thankful...mine was HPV related.
According to the Doctor...HPV related cancer is easier to treat...and the survival rate is far higher than other oral cancers.
Of course...due my cancer being at stage 4, l wasn't given many treatments options...so they opted for powerful doses of both radiation & chemo
which unfortunately left me with brutal side effects which l am still dealing with to this day..
However..l am now 7 years into remission...and happily, still alive to tell the tale. !!!

Good luck