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Hematologic malignancy Hematological malignancies are cancers that affect the blood and lymph system. The cancer may begin in blood-forming tissue (e.g., bone marrow), or in the cells of the immune system. Some types of hematologic malignancies include: Leukemia; Non-Hodgkin lymphoma; Hodgkin lymphoma; Multiple myeloma; For more information about hematologic malignancies, including common symptoms and treatment options, see blood cancers.
Tumors may occur at any age, but many types of tumors are most common in a certain age group. In adults, gliomas and meningiomas are most common. Gliomas come from glial cells such as astrocytes, oligodendrocytes, and ependymal cells. The gliomas are divided into three types: Astrocytic tumors include astrocytomas (can be noncancerous), anaplastic astrocytomas, and glioblastomas.