I know a lot of people hit a wall as to how to bring the conversation up with their medical team on other options, besides the ones they may suggest. If possible it may be a good idea to do a little research on your end and then bring up your findings with your doctor.
The doctor knows best, but having that conversation on if you would be a good candidate or not gets the ball running in self-advocacy. More important, is the clarity from your doctor on why clinical trials may be an option and what it may entail for your particular situation which calls for a juicy and hopefully transparent discussion.
Have you ever started this type of conversation with your doctor?