LINC00668 and breast cancer: We also examined the expression of Linc00668 in an array of mammary epithelial cell lines, including 2 non-transformed cell lines (HMEC hTERT, MCF-10A) and 6 breast cancer cell lines (T47D, MCF-7, SUM149, MDA-MB-231, HS578t, SUM159) by qRT-PCR (Figure 1E).