You can ask your GP to refer you to another doctor for a second opinion if you think that your present consultant is missing some treatment choices for your husband.
I am taking my third batch of treatment options now and I am doing quite well. When this fails, as it surely will some day, I will be faced with a choice of more intense treatment with limited returns or make do with palliative care and just fade away.
It is personal choice. There will come a time when I will say “no more treatment.”
John