DX SCC OF LOWER GUMS 6/09, Wisdom teeth and tumors removed 7/09, refuses rx and chemo, started methotrexact therapy 08/01/09.

My 35 year old boyfriend informed me 7/31 that he has SCC. At that time the tumors had already been removed (I thought it was wisdom teeth only). He has not informed any other family or friends of his diagnosis. He thinks he can fight this alone (with my support) until he has a remission report without anyone else ever realizing he is sick ( after a week of mtx I know better). Methotrexate dose is at 25 mg daily right now- is to increase to 100 mg daily by the end of 10 weeks. He has alot of nausea and stomach pain,, but continues to work. What can I expect and what are the odds of this treatment working without RX?