The aims of this study are to establish a method for efficient soluble expression of human squamous cell carcinoma antigen(SCCAg)based on Escherichia coli expression system and obtain the recombinant SCCAg antigen in fine activity,then apply it in the detectionmethod establishment of antigen. The study on the method of soluble expression and purification of recombinant SCCAg antigen was conductedbased on p GEX-6P-1 vector and E. coli ER2566 strain. The activity of the purified antigen was evaluated by Abbot...