PCNA and neoplasm: The Pearson correlation coefficient (R) for 15 of the tumor subtypes we studied was ≥0.5, demonstrating a strong correlation between the expression of TUBG1 and PCNA. In contrast, no significant correlation between the expression levels of TUBG2 and PCNA was found for 17 of the investigated tumors subtypes, whereas 7 and 9 tumor subtypes, respectively, showed a week negative and a positive correlation between TUBG2 and PCNA expression (R ≤ 0.5; Supplementary Fig. 12 and Supplementary Table 2).