ERBB2 and breast cancer: The RNA expression values of the ERBB2 gene in 30 breast cancer cell line panels demonstrated that SKBR3 expresses 3046 TPM (transcripts per million), BT474 expresses 2153 TPM, and MDA-MB-453 expresses 446 TPM, making SKBR3 more pronounced in expressing the ERBB2/HER2 gene than the other cell lines [29].