This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pathology
Synovial sarcoma cellular markers are -a) Cytokeratinb) S-100c) Vimentind) Calretinin 
Select and explain. 
A. abc, B. bc, C. acd, D. bcd
A: abc
Answer: A: abc 
Explanation: Immunohistochemistry: these tumors have spindle cells which are positive for vimentin and epithelial components positive for cytokeratin. More recently, molecular diagnostic studies have identitied a unique translocation, t (X;18), producing SYT/SSX1 or - SSX2 fusion genes. S-100 staining may give positive results.