TMEM26 and breast carcinoma: Measurements of the TMEM26 RNA levels in three ERα-positive (MCF-7, T47D and BT474) and three ERα-negative breast cancer cell lines (SKBR3, MDA-MB-231 and BT20) revealed that TMEM26 RNA levels are significantly higher in the ERα-positive breast cancer cell lines (Figure 1A).