Clinical Trial?????

I would like to know if anyone has done a Clinical Trial for chemo or not. I'm not sure what I want to do. All the reasons I don't want to do it is seem selfish. How long I have to go through it, wanted to feel back to normal (the way it use to be) and back to work. But then what if i'm missing out on something great. I don't know. I've been onlline reading about them so much the past 4 days or so, but still not sure. I go back to the Oncologist Wednesday and I still don't know what I will tell them. I do need to ask more questions tho, always think of them when I get home. Any advice would help. I know it is my decision but I would like to hear what everyone thinks. Thanks