Abstract
Tumor hypoxia, or the condition of low oxygen, is a key factor for tumor progression and treatment resistance. Hypoxic areas arise as a result of an imbalance between the supply and consumption of oxygen. Cellular responses to hypoxia are orchestrated through activation of the hypoxia-inducible factor family of transcription factors (HIFs). There are several approaches for detecting tumor hypoxia in head and neck cancers (HNC). Direct oxygen measurements in tissues with Eppendorf-pO2 histography have been used, but this method is invasive. Recent studies have focused on molecular markers of hypoxia, such as HIF-1 and carbonic anhydrase isozyme IX (CA-IX), and on developing noninvasive imaging techniques. Hypoxia appears to be prognostic for outcome in HNC. Several studies have shown that low pO2 in tumor, high HIF-1, Glut-1 and CA-IX expression, serum level of osteopontin correlated with treatment outcomes in HNC patients treated with RT or chemoradiotherapy. Several strategies have been used to overcome hypoxia-induced treatment resistance in HNC, such as hyperbaric oxygen treatment, accelerated radiotherapy with carbogen and nicotinamide, hypoxic cell radiosensitizers: nitroimi-dazoles, erythropoietin manipulation, and hypoxic cell cytotoxin. More recently, Micro-Environment-Vascular Normalization, HIF-1 Targeting and 18F-FMISO positron emission tomography-based intensity-modulated radiotherapy are promising methods.
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Tao, Y., Bourhis, J. (2011). Hypoxia in Head and Neck Cancers: Clinical Relevance and Treatment. In: Bernier, J. (eds) Head and Neck Cancer. Springer, New York, NY. https://doi.org/10.1007/978-1-4419-9464-6_10
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