To determine the expression of lncRNA DGCR5 in human RCC cell lines and tissues, we first screen for PCR primers targeting different exons of DGCR5 (primer sets are illustrated in Supplementary Figure 1A and Supplementary Table 1) and found the expression levels of DGCR5 in different cell lines were varied using different primer sets (Supplementary Figure 1B), indicating several isoforms may exist. This evidence concerns the gene DGCR5 and renal cell carcinoma.