Tazemetostat is a EZH2 inhibitor in trial. You can find some information about it here:
One of our members, Kaiowas reported his experience here (negative):
He may not have a mutation in SMARCB1 though. Usually SMARCB1 function is disrupted by the SYT-SSX translocation in synovial sarcoma. Your case sounds different.
The only hedgehog inhibitor mentioned on this site is GDC-0449 here:
The trial was completed and some results are posted here showing the company chose to discontinue the trial: https://clinicaltrials.gov/ct2/show/results/NCT01154452?sect=X01256#all
So far, only a few CDK4/6 inhibitors trials have been dedicated to sarcoma, usually targeting liposarcoma and nothing for synovial sarcoma specifically. There may be trials for solid tumor. A few CDK4/6 inhibitors are palbociclib, abemaciclib, ribociclib.
Votrient is a FGFR inhibitor, approved for sarcoma treatment.
Ellen’s son tried an aurora kinase inhibitor years ago: