@ina3- Good morning. Because we are not medical professionals we can't help with realistic options for your dad. I can't imagine how tough this is for you. Perhaps the biopsy will show a new direction for his doctors to take. It looks like they are moving ahead with an added chemical. Perhaps this will be the kick that is needed to defeat his cancer. Waiting is so hard. I'm so sorry that so many miles separate the 2 of you and that there are no easy answers. Cancer is hell. I hope that you are taking care of yourself. Does he have any family with him?