SOS1 and endometrial cancer: The endometrial cancer samples were divided into high-risk and low-risk groups based on the median of risk scores, calculated using the following function: risk score = (expression level of LINC01871×−0.292) + (expression level of SCARNA9×−0.284) + (expression level of SOS1 − IT1 × 0.414) + (expression level of AL161618.1×−0.703) + (expression level of FIRRE × 0.379).