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Cell detachment and metastasis

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Summary

Cancer cell detachment in three distinct and critical parts of the metastatic cascade is discussed.

  1. 1.

    The detachment of cancer cells from their parent tumors is an initial early event in metastasis. The site of detachment with respect to proximity to blood vessels may determine the initial dissemination route. Many factors affect cell detachment; we specifically consider the effects of growth-rate, necrosis, enzyme activity, and stress on cell release in terms of metastasis-promoting mechanisms.

  2. 2.

    Detachment is also discussed in relation to active cancer cell locomotion, where localized detachment from the substratum is a prerequisite for translatory movement. The importance of active cell movement in tissue invasion has only recently been assessed, and, in the case of at least some human malignant melanomas, a zone of actively moving cancer cells is believed to precede the growing body of the tumor.

  3. 3.

    The secondary release of cancer cells from temporary arrest sites at the vascular endothelium consequent upon intravascular dissemination is also a major area of investigation.

Circulating cancer cells arrest at vascular endothelium or are impacted in small vessels, however, most are released into the circulation and subsequently perish. The blood stream is a hostile environment, and it is probable that cancer cells are sufficiently damaged in translocation by hemodynamic trauma and humoral factors such that they easily detach or are ‘sheared-off’ the vascular endothelium by blood flow. Another possibility is that in some cases they are processed by ‘first organ encounters’ and perish before or shortly after arriving in a second organ. Animal studies have shown that, following intravenous injection, 60–100% of the injected dose of viable cancer cells are initially arrested in the lungs, but very few remain after 24hr. As it is only those retained cells which produce tumors, the mechanisms involved in this secondary release, which occurs in all organs so far examined, are critical to any understanding of the metastatic cascade and metastatic inefficiency.

The arrest of cancer cells at the vascular endothelium and their subsequent release have been associated with the presence of platelets, and the deposition of fibrin and manipulation of platelet-aggregating mechanisms and fibrinolysis are discussed in terms of their antimetastatic effects. The role of the reticulo-endothelial system, natural killer cells, and polymorphs is discussed in relation to cancer cell clearance from blood vessels and also to inherent cancer cell properties which may act to inhibit their metastasis.

Although detachment of cancer cells from a primary tumor may be regarded as metastasis promoting, secondary release of cancer cells may be associated with inhibition of metastasis.

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  1. Department of Experimental Pathology, Roswell Park Memorial Institute, 14263, Buffalo, NY, USA

    Leonard Weiss & Pamela M. Ward

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Weiss, L., Ward, P.M. Cell detachment and metastasis. Cancer Metast Rev 2, 111–127 (1983). https://doi.org/10.1007/BF00048965

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