Ab1	Coating antibody
Ab2	Labeling antibodies
AFP α	α-fetoprotein
ALP	Alkaline phosphatase
BSA	Bovine Serum Albumin
CA	Carbohydrate antigen
CEA	Carcinoembryonic antigen
CGS-MB	Carboxyl graphene nanosheets-methylene blue
CGS-PB	Carboxyl graphene nanosheets-Prussian Blue
CNTs	Carbon nanotubes
CP	Chitosan-poly(acrylic acid) nanospheres
CYFRA 21-1	Cytokeratin 19 fragments
DPV	Differential Pulse Voltammetry
GA	Glutaraldehyde
GCE	Glass carbon electrode
GOD	Glucose oxidase
GR	Graphene
GS	Graphene nanosheets
HCG	Human chorionic gonadotropin
IL-8	Interleukin-8
LSV	Linear-sweep stripping voltammetric
MB	Methylene blue
NPs	Nanoparticles
NSE	Neuron specific enolase
PDDA	Poly(diallyldimethylammonium chloride)
PEDOT	Poly(3,4-ethylenedioxythiophene)
PSA	prostate specific antigen
PTCA	3,4,9,10-perylenetetracarboxylic acid
Pt@SBA-15	Platinum nanoparticle-functionalized mesoporous silica
TB	Toluidine blue
THI	Thionine
SA	Sodium alginate
SPCEs	Screen-printed carbon electrodes
SWV	Square wave voltammograms