title: Hypoxia-driven immunosuppression: a new reason to use thermal therapy in the treatment of cancer?
abstract: Hypoxia within the tumour microenvironment is correlated with poor treatment outcome after radiation and chemotherapy, and with decreased overall survival in cancer patients. Several molecular mechanisms by which hypoxia supports tumour growth and interferes with effective radiation and chemotherapies are now well established. However, several new lines of investigation are pointing to yet another ominous outcome of hypoxia in the tumour microenvironment: suppression of anti-tumour immune effector cells and enhancement of tumour escape from immune surveillance. This review summarises this important information, and highlights mechanistic data by which hypoxia incapacitates several different types of immune effector cells, enhances the activity of immunosuppressive cells and provides new avenues which help 'blind' immune cells to detect the presence of tumour cells. Finally, we discuss data which indicates that mild thermal therapy, through its physiologically regulated ability to alter vascular perfusion and oxygen tensions within the tumour microenvironment, as well as its ability to enhance the function of some of the same immune effector activities that are inhibited by hypoxia, could be used to rapidly and safely release the tight grip of hypoxia in the tumour microenvironment thereby reducing barriers to more effective immune-based therapies.
authors.affiliation: Department of Immunology, Roswell Park Cancer Institute, Buffalo, New York 14263, USA.
authors.forename: Chen-Ting
authors.initials: CT
authors.lastname: Lee
authors.forename: Thomas
authors.initials: T
authors.lastname: Mace
authors.forename: Elizabeth A
authors.initials: EA
authors.lastname: Repasky
mesh_terms: D003131:Combined Modality Therapy; D006801:Humans; D006979:Hyperthermia, Induced / Q000009:adverse effects* / Q000379:methods; D000860:Hypoxia / Q000276:immunology; D007165:Immunosuppression Therapy / Q000009:adverse effects*; D008833:Microcirculation; D009369:Neoplasms / Q000276:immunology* / Q000628:therapy*
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