For instance, Geng and co-workers prepared two THz metamaterial biosensors with integrated microfluidics and found that the liver cancer biomarkers alpha-fetoprotein (AFP) and glutaminyl transferase isozyme II (GGT-II) showed resonance shifts of about 19 GHz (5 mu/ml) and 14.2 GHz (0.02524 μg/mL).76 This evidence concerns the gene AFP and liver cancer.