SAA1 and Behcet disease: In the moderate BD group, highly expressed proteins were primarily involved in defense response (CRP, ORM1, CFH, C1S, RARRES2, CFI, MST1, KRT1, SAA4, HP, TNC, HPR, IFNW1, KNG1, LOC102723996, C9, SAA1, LBP, APOL1, CFB), acute‐phase response (CRP, ORM1, SAA4, SAA1, HP, HPR, LBP), and immune response (CRP, IGHV3‐43D, CFH, C1S, IGHV3‐11, RARRES2, CFI, MST1, KRT1, IFNW1, ICAM1, VTN, AZGP1, LOC102723996, C9, IGHD, ENPP2, LBP, APOL1, CFB).