Figure 2From: A systems biology approach to invasive behavior: comparing cancer metastasis and suburban sprawl developmentSimilar Initiating Factors. Left side figure shows invasive bladder carcinoma (arrow) invading into normal tissue. These tumors are often induced by the overproduction of growth-promoting hormones. Right side shows aerial imaging of residential and retail development (arrow) encroaching into a rural area. These developments are most often initiated by economic potential rather than societal need. Satellite image courtesy of Google 2008 Tele Atlas; photomicrograph courtesy of William Frable, M.D., used with permission.Back to article page