Through quantifying Src protein expression levels via western blotting in 11 pairs of esophageal cancer and adjacent noncancerous tissues (the clinical information of these tissue specimens is listed in Table S2), 10 out of 11 pairs of tissues showed conspicuously higher levels of Src protein in cancer tissues compared to that in corresponding noncancerous tissues (Fig. 1C and D). Here, SRC is linked to cancer.