SPP1 and prostate carcinoma: Lerner et al. developed a novel detection method for osteopontin (OPN), a new biomarker for prostate cancer, by attaching a genetically engineered single‐chain variable fragment (scFv) protein with high binding affinity for OPN to a carbon nanotube field‐effect transistor (NT‐FET) to investigate the use of CNTs in PCa diagnosis.184