v-Src is a mutationally activated form of the non-receptor tyrosine kinase c-Src, and c-Src has been shown to be activated frequently in human cancers, such as breast (Hennipman et al, 1989; Ottenhoff-Kalff et al, 1992), colon (Bolen et al, 1987; Cartwright et al, 1990; Talamonti et al, 1993), skin (Barnekow et al, 1989), bladder (Fanning et al, 1992) and pancreas cancers (Lutz et al, 1998). Here, SRC is linked to cancer.