For example, lncRNA PTENP1, a group of three lncRNAs (MALAT1, PCAT-1, and SPRY4-IT1) [21,22], and a panel of three lncRNAs (PCAT-1, UBC1, and SNHG16) were encapsulated in BLCA urine or blood exosomes and could serve as essential biomarkers for disease diagnosis or prognosis [13]. Here, PCAT1 is linked to bladder transitional cell carcinoma.