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. Author manuscript; available in PMC: 2013 May 1.
Published in final edited form as: Expert Rev Mol Diagn. 2012 Jul;12(6):621–628. doi: 10.1586/erm.12.46

Figure 1. A variety of endogenous and exogenous factors contribute to a diversity of tumor–host interactions and carcinogenesis processes, leading to intertumor heterogeneity and the uniqueness of each tumor.

Figure 1

To simplify, only several examples of such factors are shown, and no interaction between the factors is depicted. In addition, there is probably a chance factor in the process of carcinogenesis.