Summary
The continuous growth of metastases that are resistant to conventional therapies is the major cause of death from colorectal carcinoma. Recent data indicate that metastases can arise from the nonrandom spread of specialized subpopulations of cells that preexist within the primary tumor, that metastases can be clonal in their origin, that different metastases can originate from different progenitor cells, and that metastatic cells can have an increased rate of spontaneous mutation as compared with benign, nonmetastatic cells. Therefore, the successful therapy of disseminated metastases will have to circumvent the problems of cancer heterogeneity and the development of tumor cell resistance to therapy.
Appropriately activated macrophages can fulfill these demanding criteria. Macrophages obtained from normal donors or from patients with colorectal carcinoma can be activated to become tumoricidal subsequent to endocytosis of phospholipid vesicles (liposomes) containing specific immunomodulators. Macrophages thus activated can recognize and destroy neoplastic cells in vitro or in vivo, while leaving nonneoplastic cells unharmed. Moreover, macrophage destruction of tumor cells is not associated with the development of tumor cell resistance.
The major limitations of many cancer therapies are their lack of selectivity against cancer cells. The ability of tumoricidal human monocytes to distinguish neoplastic from bystander nonneoplastic cells, therefore, presents an attractive possibility for treatment of disseminated cancer.
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© 1986 Martinus Nijhoff Publishing, Boston
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Fidler, I.J., Jessup, J.M., Kleinerman, E.S., Fogler, W.E., Mazumder, A. (1986). Circumvention of Neoplastic Heterogeneity by Systemically Activated Macrophages. In: Mastromarino, A.J. (eds) Biology and Treatment of Colorectal Cancer Metastasis. Developments in Oncology, vol 42. Springer, Boston, MA. https://doi.org/10.1007/978-1-4613-2301-3_25
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DOI: https://doi.org/10.1007/978-1-4613-2301-3_25
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