Figure 3

Immunohistochemical staining for CK, α–SMA, Myoglobin, MyoD1, Desmin and Ki-67 in the tumor. A, The tumor cells were negative for CK. B, α–SMA was expressed in the wall of blood vessel, but not expressed in tumor cells. C, Myoglobin immunostaining highlighted the entrapped striated muscle cells, but was not positive in tumor cells. D, The tumor cells showed a diffuse positive immunostaining for MyoD1. E, The majority of the cells were positive for Desmin. F, Ki-67 index was approximate 60%.