Words similar to tumor-bearing
Example sentences for: tumor-bearing
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In some circumstances, CD4 +and CD8 +T cells were rendered inactive in tumor-bearing hosts [ 8 ] . The inactivation of CD4 +T cells has been attributed either to the tumor cells themselves or to bone marrow-derived cells [ 9 10 11 ] , whereas antigen ignorance or loss of memory have been postulated to underlay that of CD8 +T cells [ 12 13 ] . Other studies have suggested that tumor cells can secrete immunosuppressive factors such as TGF-β or express Fas ligand to induce apoptosis of infiltrating lymphocytes [ 14 15 16 ] . Furthermore, the tumor vasculature appears to be quite different from normal blood vessels, in terms of structural organization, interstitial pressure, and flow patterns [ 17 ] , and in reduced lymphocyte and natural killer cell homing and adhesion [ 18 19 20 21 ] . The existence of significant barriers to effective immunological destruction is further illustrated by a mouse model of concurrent multistage tumorigenesis and anti-oncogene autoimmunity, wherein progenitor dysplastic lesions are infiltrated and disrupted, while solid tumors are not [ 22 ] . The hypothesis is that the microenvironment of certain types of solid tumor can serve to locally suppress T cell infiltration.
However, when T cells reactive against tumor antigens are expanded ex vivo and then transferred back into tumor-bearing hosts, results have been mixed in treating both melanoma [ 2 3 4 ] and lymphoma [ 5 6 7 ] . Several explanations for these variable results have been suggested by studies of T cell immunity in mice, involving experimental tumors derived from inoculation of cell lines.
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