Objective To detect the expression of New York esophageal squamous cell carcinoma antigen 1 (NY?ESO?1) in common types of mesenchymal myxoid tumors, and to investigate its significance in the diagnosis and differential diagnosis of myxoid liposarcoma. Methods A total of 43 formalin?fixed paraffin?embedded samples of mesenchymal myxoid tumors from the Affiliated Hospital of Qingdao University and Qingdao Municipal Hospital ranging between 2010 and 2017 were selected. NY?ESO?1 expression was detected by immunohistochemical staining. DDIT3 gene status was detected by fluorescence in situ hybridization (FISH). NY?ESO?1 mRNA was detected by reverse transcription?PCR (RT?PCR). Results Histopathology and FISH results confirmed that there were 11 cases of myxoid liposarcoma and 32 other types (including 7 cases of well?differentiated liposarcoma, 1 dedifferentiated liposarcoma, 3 lipomas, 2 lipoblastomas and 19 non?adipocytic tumors). Immunohistochemical staining showed that the positive expression propotion of NY?ESO?1 in myxoid liposarcoma was 11/11, and the positive location was the cytoplasm and nucleus of lipoblast cells. The expression intensity is higher in regions with round cell differentiation. Among the 32 cases of other mesenchymal myxoid tumors, only one well?differentiated liposarcoma showed positive immunoreactivity for NY?ESO?1. RT?PCR confirmed that 7 cases of myxoid liposarcoma (7/11) and one well?differentiated liposarcoma (1/7) had NY?ESO?1 mRNA expression. Conclusions NY?ESO?1 is positively expressed in myxoid liposarcoma. It can be served as a useful marker for the diagnosis and differential diagnosis of myxoid liposarcoma.

Objective: To detect the expression of New York esophageal squamous cell carcinoma antigen 1 (NY-ESO-1) in common types of mesenchymal myxoid tumors, and to investigate its significance in the diagnosis and differential diagnosis of myxoid liposarcoma. Methods: A total of 43 formalin-fixed paraffin-embedded samples of mesenchymal myxoid tumors from the Affiliated Hospital of Qingdao University and Qingdao Municipal Hospital ranging between 2010 and 2017 were selected. NY-ESO-1 expression was detected by immunohistochemical staining. DDIT3 gene status was detected by fluorescence in situ hybridization (FISH). NY-ESO-1 mRNA was detected by reverse transcription-PCR (RT-PCR). Results: Histopathology and FISH results confirmed that there were 11 cases of myxoid liposarcoma and 32 other types (including 7 cases of well-differentiated liposarcoma, 1 dedifferentiated liposarcoma, 3 lipomas, 2 lipoblastomas and 19 non-adipocytic tumors). Immunohistochemical staining showed that the positive expression propotion of NY-ESO-1 in myxoid liposarcoma was 11/11, and the positive location was the cytoplasm and nucleus of lipoblast cells. The expression intensity is higher in regions with round cell differentiation. Among the 32 cases of other mesenchymal myxoid tumors, only one well-differentiated liposarcoma showed positive immunoreactivity for NY-ESO-1. RT-PCR confirmed that 7 cases of myxoid liposarcoma (7/11) and one well-differentiated liposarcoma (1/7) had NY-ESO-1 mRNA expression. Conclusions NY-ESO-1 is positively expressed in myxoid liposarcoma. It can be served as a useful marker for the diagnosis and differential diagnosis of myxoid liposarcoma.