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Its application could also be extended for global profiling of other complicated chemical systems, such as Chinese medicinal formulas.A novel sandwich-type electrochemical immunosensor has been fabricated for simultaneous determination of three kinds of tumor markers (TMs). The signal-amplified platform for sensor was assisted by graphene oxide (GO) loaded with Poly(styrene-alt-maleic anhydride) (PSMA). Three TMs of prostate specific antigen (PSA), human a-fetoprotein (AFP) and carbohydrate antigen 125 (CA 125) were employed as model test