Cancer in lungs

Well I had a needle biopsy earler this week to a lung nodule to confirm that it was MPNST sarcoma mets to my lung.  My doctor told me the news Friday that it was positive for MPNST mets and that it was at stage 4.  Now they want to do a biopsy to my lymp nodes in my throat because they showed hot spots in the PET scan also.  They said if I have cancer in my lymph nodes then all that will be done would be chemo with a 20 to 30% chance it will work.  If there is no cancer then they would proceed with the surgery to remove part or all of my left lung.  They said they would need to get a clean margin so not sure how much of lung till they get in there.  He also said that I would have a good chance to do clinical trials and that all expenses would be paid for me to go.  I would only have to pay for my wife transportation and meals who I would want there by my side.  I posted info in the sarcoma area but had no replys so I thought I would post this here because it is rare cancer and sarcoma.  At this stage I'm looking for info on expericence with clinical trials.  If anybody has gone through these and what did they think of it.  Any info would be great.  Thank you.