TABLE 2.

Electrochemical sensor for RNA biomarkers in hematological malignancies.

Target	Sensor	Linear range	LOD	References
miRNA-21	Au-RGO/TiPCd2+/Ru(NH3)6 3+	1 aM–10 pM	0.76 aM	Cheng et al. (2015)
miRNA-21	Graphene/GME	-	3.12 pM	Kilic et al. (2015)
miR-155	SS-probe/GO/GNR	2.0 fM–8.0 pM	0.6 fM	Azimzadeh et al. (2016)
miR-155	Amino-graphene	30 pM–1 nM	12.5 pM	Salimi et al. (2019)
miR-122	Graphene-PGE	0.5–7 μg/ml	1.06 pM	Kilic et al. (2016)