What Could Explain Late Reccurences/Metastases?

Researchers at Mount Sinai found a gene NR2F1 that could explain dormancy in cancer cells:

http://www.mountsinai.org/about-us/newsroom/press-releases/master-s...

The study was not done on synovial sarcoma but different cancer types:

http://www.ncbi.nlm.nih.gov/pubmed/25636082

Does this apply to synovial sarcoma? Some patients have very aggressive disease from the start while others have very long remission periods. It would be interesting to know why...