Looks like there's a new cancer vaccine technique that may be used to target synovial sarcomas:-

Steven A. Rosenberg, M.D., Ph.D. is running multiple cancer vaccination trials. One of them is an NY-ESO-1 trial. The list is here: http://bethesdatrials.cancer.gov/investigator-profiles/rosenberg/default.aspx 

It looks like he's accepting mainly melanoma and renal cancer cases.