Hi - my dad has been on 2 or 3 trials. The one thing I like about trials is the constant checkups/scans. In some cases the trials end, and in some cases they continue until growth/patient wants out.
On the last 2 trials my dad was on, some growth was seen so the trial was stopped. Afterwards he was offered another type of treatment (one case a trial, one case standard treatment).
With regard to limiting options, my thought is that you are not limited by the trials you do in terms of conventional treatments later on, but if you do conventional treatments and then want to try a trial you may be more limited. But that is only my thoughts. Not necessarily how it ultimately works.
Paula