CUL4B and breast cancer: Spearman's correlation showed that the expression of CUL4B protein in BC tissues was negatively correlated with E-cadherin (r = –0.462, P < 0.001) but positively correlated to N-cadherin expression (r = 0.318, P < 0.001) and Vimentin expression (r = 0.201, P = 0.016) (Table 2).