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Epidemiology of Diffuse Low-Grade Gliomas

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Diffuse Low-Grade Gliomas in Adults

Abstract

Diffuse low-grade gliomas (DLGGs) belong to primary central nervous system tumors (PCNSTs) and include diffuse astrocytomas (fibrillary astrocytoma, gemistocytic astrocytoma, protoplasmic astrocytoma), oligodendroglioma, and oligoastrocytoma.

Specific epidemiological publications of DLGG are very rare. However, it is possible to obtain epidemiological data concerning DLGG by selecting some publications referring to all PCNSTs, gliomas, or even to low-grade gliomas (LGGs). (We will show that the term “LGG” is not well appropriate.).

This work summarizes the definitions and descriptive epidemiological data for DLGG and PCNST. DLGGs account for approximately 15 % of all gliomas, and incidence rate is about 1/100,000 person-years or just a little less. Main prognostic factors (e.g., age, performance status, location, volume and growth rate of the tumor, extent of surgical resection, histology) are discussed, and it is shown how they influence survival. Recent literature proposes a lot of new spontaneous prognostic factors, but until now, just a few are validated. In the other hand, little data are available to define best combinations of the different therapeutic strategies (successive surgeries, chemotherapy, radiotherapy, and new treatments).

This work proposes new efficient methodology to evaluate medical care and quality of life. The developments of modern informatics technology will revolutionize our methods of recording data. Collaboration between all medical specialties (including epidemiology and biostatistics) and development of large databases are the keys of efficiency for the future.

This chapter also summarizes knowledge of risk factors for DLGG and PCNST and proposes classical and new directions for searching etiologies for these tumors.

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Bauchet, L. (2013). Epidemiology of Diffuse Low-Grade Gliomas. In: Duffau, H. (eds) Diffuse Low-Grade Gliomas in Adults. Springer, London. https://doi.org/10.1007/978-1-4471-2213-5_2

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