COL7A1 and sarcoma: The 1-year AUC values for TCGA training cohort of the SAGRI constructed using the four sarcoma-like differentiation-related genes (COL7A1, LCTL, NPR3, ZFHX4) were 0.725 in the training set, 0.712 in the internal validation set, and 0.770 in the external validation set.