In this regard, transcripts of prostate cancer biomarkers, including kallikrein-related peptidase-2 and −3 (KLK2, KLK3), folate hydrolase 1 (FOLH1), and neuropeptide-Y (NPY), were found exclusively in the platelet fraction of cancer patients and were absent in healthy controls [196]. This evidence concerns the gene NPY and Familial prostate cancer.