We found that the level of HCK mRNA transcripts and HCK protein expression were both higher in highly invasive and metastatic BT549 and MDA-MB-231 triple-negative breast cancer cells than that in less invasive and metastatic SKBR3 and MCF7 breast cancer cells (Fig. 2E, 2F). This evidence concerns the gene HCK and triple-negative breast carcinoma.