ERBB2 and breast cancer: However, we did not find a significant difference among different cell lines, including BT549 (ER/PR/HER2-negative), MCF-7 (ER+), SK-BR-3 (HER+), T47D (ER+), MDA-MB-231 (ER/PR/HER2-negative), which suggest that has_circ_0000069 may have no significant difference among different types of breast cancer.