How many people live in the brain
Malignant neoplasms of the braindiffer in the features of the clinical course and prognosis. The average length of life with malignant intracranial tumors after the surgical treatment is 20 weeks, and the one-year survival rate is 20-25%. Carrying out radiotherapy in the postoperative period increases the average life span of a brain tumor to 36 weeks, and adjuvant chemotherapy up to 50 weeks. According to the American Cancer Society, the overall 5-year survival of patients with brain tumors in 1975-1977 was 24%, in 1984-1986. - 29%, in 1996-2002. - 34%.
Tumors of the brain differ fromneoplasms of other localization by histogenesis, clinical manifestations, treatment possibilities. The presence of the blood-brain barrier also determines the specificity of tumors, as it limits the penetration of many substances (including medicinal) from the blood into the brain tissue. According to the nature of the clinical course, all neoplasms of the brain are malignant, since they lead to death due to hypertension and dislocation of the brain. There are fast-growing (gliomas, metastases, glioblastomas, adenocarcinomas) and relatively slowly growing (meningiomas, adenomas) tumors. This division is relatively arbitrary, since the place of cancer growth is of no small importance. Distinguish primary cancers originating from the brain and spinal cord, and metastatic, spreading from tumors that damage the organs of a particular system. Primary cancers develop from glial cells (astrocytoma, oligodendroglioma, glioblastoma), ependymoma cells (ependymoma) and tissues supporting the life support of the brain (meningioma, schwannoma, papilloma of the vascular plexus). In childhood, neoplasms originate from less differentiated cells (medulloblastoma, neuroblastoma, chordoma). In adults 40-45% of all brain cancers are gliomas, 18-20% - meningiomas, 8% - neurinomas of the VIII nerve, 6-8% - adenomas of the pituitary gland. Neoplasms of the brain can occur at any age, numerous studies allow us to divide patients into 2 large groups. The first group includes children aged 3 to 12 years, to the second group - adults aged 40-70 years.
In 2007, the incidence of brain cancer, other and unspecified parts of the nervous system was 4.4 per 100 thousand population: among men - 5.0, among women - 3.9.
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