The article claims that objective responses were observed in patients with synovial sarcoma:
http://www.ncbi.nlm.nih.gov/pubmed/21060028
If anybody is interested, I have the actual pdf article for this study. There was 2 patients with synovial sarcoma (13 year old female and 18 year old male) in this study. They both had partial responses to the drug but also both experienced pneumothorax.