Tuesday, November 29, 2016 1:19:06 PM
ES4-1 Basic science of immunotherapy
Knutson KL Mayo Clinic Florida, Jacksonville, FL
While it remains unclear whether the immune system naturally evolved to prevent cancer, it is clear that many of its constituent cells and factors can greatly influence the clinical course of the disease in many different cancers, including breast cancer. Generally speaking, the immune system is a double edged sword and produces a broad array of both pro-tumor and anti-tumor factors. Of those which demonstrate anti-tumor activity, antigen-specific T cells (including both cytotoxic and helper T cells) are the most important as several studies have now shown that increased T cell infiltration is generally, and markedly, protective. More recent evidence also suggests that B cells can also be protective, particularly when producing tumor-specific antibodies or associated with intratumoral tertiary lymphoid structures. Thus, newer therapeutics being developed in academia and industry are being designed to directly augment adaptive immunity. The methods to manipulate the numbers of lymphocytes is growing and includes direct clonal expansion approaches such as vaccination and adoptive T cell therapy as well as more indirect methods that modulate cell intrinsic regulatory mechanisms (e.g. checkpoint and co-stimulatory pathways). In contrast, the pro-tumor activity of the immune system is largely mediated by the myeloid compartment of the immune system. While normal myeloid cells are not generally pro-tumorigenic, most tumors impair proper myeloid differentiation inducing intratumoral and systemic accumulation of defective myeloid cells which have profound tumor-promoting activity. This tumor-promoting activity of myeloid cells is mediated either through direct tumor growth-promoting activity (e.g. growth and angiogenic factors) or through blockade of adaptive immune response. Mechanisms by myeloid cells promote tumor growth appear to be diversified and are now only recently becoming understood, but nonetheless represent unique targets for therapeutic manipulation either alone in combination with other therapeutic modalities (e.g. checkpoint blockade). The basic underpinnings of tumor immunology are being rapidly identified and applied clinically to treat a variety of cancers and more recently breast cancer. This educational lecture will be a general overview of tumor immunology focusing on recent basic and therapeutic advances, highlighting those relevant to the field of breast cancer.
Session: Educational Session 4 (3:45 PM-5:15 PM)
Date/Time: Tuesday, December 6, 2016 - 3:45 pm
Room: Stars at Night Ballroom 3&4-3rd Level
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