My mother decided against both oncologist and ENT's recommendation not to have surgery to remove part of her tongue last May. She agreed to neck dissection followed by radiation/chemo. By December her ENT was worried that there was a spot on her tongue that he hoped was the remains of scarring from radiation. He had her biopsied and it was cancer again. Only this time it had spread to her mandible and floor of mouth. After all the tests again she was scheduled for surgery in February. She had over 1/2 her tongue removed her mandible on the right side and part of the floor of her mouth. She was in surgery for over 6 hours and in the hospital for a month due to infection, etc. My point is that maybe you can convince your mother she should get more information from more informed sources before she opts to listen to her GP. My mother is still recovering and wishes she had listened to her doctor last May and maybe she would not have had to have such drastic surgery. She is doing well, but has a very difficult eating, drinking and swallowing as well as much altered speech. You have been through the ringer with every thing else, but you will most likely regret not trying at least once more to convince your mother to see another doctor before she makes her final decision. Best of luck!!!!