CAV1 and carcinoma: While Cav-1 is virtually absent in pancreatic ductal or acinar epithelial cells from which these tumors are derived (intensity score 0), 100% of 106 tumors with available staining data had some degree of Cav-1 staining: in the carcinoma cells, 60% were scored as weak (intensity score 1), 34% intermediate (intensity score 2), and 6% strong (intensity score 3) (Fig. 1B, right).