Immunotherapy against head and neck cancer stem cells Immunologic therapies like antibodies in solid tumors like squamous cell cancer of the head and neck are administered either alone or in combination with radiation and chemotherapy. Despite some respectable successes, the effect of this therapy reaches its limits due the ability of the tumor to escape the immune system. Cancer stem cells seem to play an important role in this process due to their intrinsic resistance to conventional therapy and the ability to regenerate tumor heterogeneity. This way they substantially contribute to the formation of recurrences and metastases. Therefore, future immunotherapies should target specifically this subpopulation, possibly in combination with other therapeutic modalities. In this review the immunologic features of cancer stem cells and their potential as target for immunotherapies is summarized.
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