A recent publication from Italy talks about the latest approaches to treat synovial sarcoma:
http://www.ncbi.nlm.nih.gov/pubmed/24661286
Here are clinical trials that follow those approaches:
http://www.clinicaltrials.gov/ct2/show/NCT01154452
http://www.clinicaltrials.gov/ct2/show/NCT01288573
http://www.clinicaltrials.gov/ct2/show/NCT01879085