CXCR1 and neoplasm: Based on an unsupervised hierarchical clustering in all tumor specimens, we readily identified three distinct clusters: clusters A and B (TS‐CA and TS‐CB), with the lowest and highest expression of TSs or all 10 telomerase genes, respectively, and cluster C (TS‐CC) as the intermediate subtype showing their inconsistent expression levels among 10 genes (Fig. 1C).