Similarly, in 38 breast cancer cell lines (Additional file 5), the expression of the ERBB2 gene was significantly correlated with the expression of all the 5 members of the TNFAIP1/POLDIP2 SFGM, although the total number of observed significant correlations was less than for the breast cancer patients (Figures 8A, B). Here, POLDIP2 is linked to breast cancer.