CDKN1B and neoplasm: To test whether endogenous TEAD4 also promotes TNBC cell proliferation and tumor growth, we stably knocked down TEAD4 in HCC1806 cells (Figure 3A) and HCC1937 (Figure S2A), and as expected, stable knockdown of TEAD4 increased the p27 protein levels (Figures 3A and S2A) and inhibited cell growth in vitro (Figure 3B and S2B).