Figure 2From: Mining metastasis related genes by primary-secondary tumor comparisons from large-scale databasesTumor class diagram. Each of the four classes is described in this figure. A is a primary tumor arisen in liver. C is a primary tumor arisen in colon. B and D are both metastatic tumors disseminated from primary colon tumors. Primary tumors are denoted by blue circles, metastatic tumors are denoted by red circles.Back to article page