TCF19 and neoplasm: In line with the observation that inhibition of 786‐O cell growth in vitro by silencing of the TCF19 gene, the remarkable reduction in TCF19 expression (Figure S12B) and a significant suppression of tumor growth rate as well as smaller tumor volume were observed in TCF19‐siRNA 786‐O tumor xenografts compared with Ne‐siRNA group (Figures 1F and S12C).