Cancer Control Research
5R01CA028498-03
PI Name is not available.
TUMOR IMMUNOTHERAPY WITH PHARMACOLOGICAL AGENTS
AbstractCurrent understanding of the complex cellular interactions involved in the
immune reaction to tumor-specific antigens illuminates the suppressor system as
a potential target for cancer therapy. If suppressive regulation of the
tumor-specific immune response could be eliminated specifically, or reduced, the
tumor rejection potential of the host would be augmented significantly. The
existence of differential biochemical susceptibility among sub-populations of
immune cells suggests that the balance between beneficial and detrimental
components of the tumor-specific immune response (i.e., immune rejection
potential) can be altered favorably through pharmacological means. Therefore,
we plan to evaluate a therapeutic strategy for the specific elimination of
suppressor activity in the tumor host through pharmacological means. A
spontaneous autochthonous murine breast tumor model will be employed to identify
drugs (dosages, drug combinations, and treatment schedules) which will result in
specific reduction of suppressor activity with no, or minimum, interference with
the beneficial components of the tumor-specific immune response. Treatment will
be monitored by in vitro assay of non-specific (PHA-stimulation), and
tumor-specific immune suppressor activity, as well as by assay of tumor-specific
cytotoxic activities including direct cell-mediated cytotoxicity, and antibody
mediated, complement-dependent and lymphocyte-dependent, cytotoxicity.
Therapeutic efficacy of the various drug treatments will be evaluated in the
autochthonous-tumor-bearing host, against a large tumor burden, and against
residual local and metastatic tumor foci after reduction of the tumor burden
with surgery and/or conventional cancer chemotherapy. The spontaneous,
autochthonous murine breast tumor to be employed here is considered to be an
excellent model for the human disease, and therefore, it is anticipated that
results forthcoming from these studies will provide a basis for translation of a
pharmacological approach to immunotherapy of cancer in man.
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