SNAI1 and soft tissue sarcoma: For comparison, the average log normalized expression value for the transcription factor SNAIL (SNAI1), which play a key role regulating the behavior of some sarcoma cell types [45, 46] was 3.50 for all samples in this study, while that of keratin 13 (KRT13), which is expressed in epithelial cell types [47] but is not expected to be significantly expressed in soft tissue sarcomas, was -1.47.