PTENP1 and nonpapillary renal cell carcinoma: Wu et al. determined the expression of 91 cancer-associated lncRNA molecules in serum from ccRCC patients, and then established 5 lncRNA signatures (i.e., lncRNA-LET, PVT1, PANDAR, PTENP1 and lnc00963) serving as potential markers for discriminating ccRCC patients from healthy controls.