To investigate in which type of breast cancer cells LINC00899 has a notable biological role, RT-qPCR was used to detect the relative expression levels of LINC00899 in the MDA-MB-231 (triple-negative-type), MCF-7 (luminal-type), SKBR3 (HER2-type) and MCF-10A (normal human breast epithelial cells) cell lines. This evidence concerns the gene ERBB2 and breast cancer.