SAPCD2 and fibrosarcoma: Based on the SI of the 66 fibrosarcoma samples examined above by IHC, low and high SAPCD2 expression was stratified by the following criteria: SI ≤ 3 was used to define fibrosarcoma tissues with low SAPCD2 expression, and SI ≥ 4 was used to define fibrosarcomatissues with high SAPCD2 expression.