KLK3 and cancer: In 2014, Wang and collaborators instead realized a field-effect sensing device based on a molybdenum disulfide (MoS2) multi-layer, demonstrating its ability to detect cancer markers in liquid-phase with a 375 fM limit of detection through a change in the transistor drain current induced by the biorecognition between antibodies immobilized on the MoS2 film surface and prostate-specific antigens (PSA) (Figure 12).