PTK2 and desmoplastic small round cell tumor: Baseline FAK, Src, pFAK (Tyr397), and pSrc (Tyr416) expressions were assessed in the tumor tissue of primary and post-treatment resections, metastatic or locally recurrent DSRCT (n = 13), ES (n = 68), ARMS (n = 21), and ERMS (n = 39).