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Association of disseminated tumor cells in the bone marrow with cancer metastasis. DTCs: Disseminated tumor cells; CTCs: Circulating tumor cells; CEPs: Circulating endothelial progenitors; MMP: Matrix metalloproteinase; BM: Bone marrow; BMDCs: BM-derived cells; EMT: Epithelial-mesenchymal transition. Adapted from Aft et al[21].
