2 new trials were added last week to ClinicalTrials.gov that I think may be relevant for us.
The first one is using a drug that has an effect on which genes are turned on of off:
The particular agent used in this study has not been tried on synovial sarcoma cells but one similar agent was deemed to have therapeutic potential in synovial sarcoma:
The 2nd trial is a vaccine:
Here is a study that explains the theory behind this vaccine and describes a case report: