The c-SRC non-receptor tyrosine kinase is overexpressed and activated in a large number of human malignancies and has been linked to the development of cancer and progression to distant metastases. These observations have led to the recent targeting of c-SRC for the development of anticancer therapeutics, which show promise as a new avenue for cancer treatment. Despite this, however, the precise functions of c-SRC in cancer remain unclear. In addition to increasing cell proliferation, a key role of c-SRC in cancer seems to be to promote invasion and motility, functions that might contribute to tumour progression.