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. 2021 May 7;11:672195. doi: 10.3389/fonc.2021.672195

Figure 1.

Figure 1

Overview of the metastatic cascade. The metastatic process includes invasion, intravasation, circulation, extravasation and colonization. CTCs detaching from the primary tumor can travel alone or as clusters. Enumeration, molecular profiling and expansion of CTCs in non-metastatic tumors could provide a better understanding on the significance of CTC early dissemination. Figure created in BioRender.com.