The following study suggests that MLN0128 has better antiproliferative effects than rapamycin in a synovial sarcoma cell line among others:
http://www.ncbi.nlm.nih.gov/pubmed/25519700
I remember reading about one patient with synovial sarcoma who had some success with rapamycin in combination with sutent for one year...
The future will tell if this is a good drug but for now, here are some clinical trials testing it: