CCR7 and breast carcinoma: Compared to HS578T-Hyg breast cancer cells and M13HS hybrids M13SV1-EGFP-neo breast epithelial cells exhibiting stem cell characteristics expressed markedly lower CCR7 levels, which might be an explanation for previous flow cytometry data showing virtually no CCR7 expression on M13SV1-EGFP-Neo cells [5].