Brain tumor medical therapy: Difference between revisions

	Brain tumor Microchapters
Patient Information
Overview
Classification Adult brain tumors Glioblastoma multiforme Oligodendroglioma Meningioma Hemangioblastoma Pituitary adenoma Schwannoma Primary CNS lymphoma Childhood brain tumors Pilocytic astrocytoma Medulloblastoma Ependymoma Craniopharyngioma Pinealoma Metastasis Lung cancer Breast cancer Melanoma Gastrointestinal tract cancer Renal cell carcinoma Osteoblastoma Head and neck cancer Neuroblastoma Lymphoma Prostate cancer
Causes
Differentiating Brain Tumor from other Diseases

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Revision as of 20:53, 20 August 2015

Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]

Overview

Although there is no generally accepted therapeutic management for primary brain tumors, a surgical attempt at tumor removal or at least cytoreduction (that is, removal of as much tumor as possible, in order to reduce the number of tumor cells available for proliferation) is considered in most cases^[1]. However, due to the infiltrative nature of these lesions, tumor recurrence, even following an apparently complete surgical removal, is not uncommon. Postoperative radiotherapy and chemotherapy are integral parts of the therapeutic standard for malignant tumors. Radiotherapy may also be administered in cases of "low-grade" gliomas, when a significant tumor burden reduction could not be achieved surgically.

Chemotherapy may be used with surgery or radiation treatment.

Medical Therapy

Some drugs that are used to treat brain cancer are:

Everolimus- FDA approved - approved to treat Subependymal giant cell astrocytoma in patients who have Tuberous Sclerosis and are not able to have surgery.
Bevacizumab- FDA approved - approved to treat Glioblastoma in patients whose disease has not gotten better with other types of treatment.

Lomustine- FDA approved - used in patients who have already had surgery or radiation therapy

Temozolomide- FDA approved - used in adults for the treatment of Anaplatic astrocytomas and Glioblastoma multiforme

Other medications used to treat primary brain tumors in children may include:

Corticosteroids, such as dexamethasone, to reduce brain swelling
Medicines such as urea or mannitol to reduce brain swelling and pressure
Anticonvulsants, such as evetiracetam (Keppra), to reduce seizures
Pain medications
Antacids or histamine blockers to control

Contraindicated medications

Cerebral neoplasm is considered an absolute contraindication to the use of the following medications:

Streptokinase

References

↑ Nakamura M, Konishi N, Tsunoda S, Nakase H, Tsuzuki T, Aoki H, Sakitani H, Inui T, Sakaki T. Analysis of prognostic and survival factors related to treatment of low-grade astrocytomas in adults. Oncology 2000;58:108-16. PMID 10705237.

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[1] Nakamura M, Konishi N, Tsunoda S, Nakase H, Tsuzuki T, Aoki H, Sakitani H, Inui T, Sakaki T. Analysis of prognostic and survival factors related to treatment of low-grade astrocytomas in adults. Oncology 2000;58:108-16. PMID 10705237.

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 |MedCond = Cerebral neoplasm|Streptokinase}}
-===Radiation Therapy===
-In case of a malignant brain tumor, radiation therapy is needed to control the tumor and possibly acheive long-term remission.
-There are some possible side effects of radiation therapy; these include the possibility of strokes and [[Dementia]]. The severity as well as the chance that they happen, worsen with higher doses of therapy. The radiation therapy is usually very well tolerated.
-'''Stereotactic Radiosurgery:'''
-Stereotactic radiosurgery is a special form of
-radiation therapy - it is not surgery. Stereotactic
-radiosurgery allows precisely focused, high dose
-X-ray beams to be delivered to a small, localized
-area of the brain. It is used to treat small brain and
-spinal cord tumors (both benign and malignant);
-blood vessel abnormalities in the brain; deﬁned
-areas of cancer; certain small tumors in the lungs
-and liver; and neurologic problems such as
-movement disorders.Stereotactic radiosurgery is given in
-a single session. If given in multiple sessions, the
-treatment may be called stereotactic radiotherapy
-or fractionated stereotactic radiotherapy.
-“Frameless radiosurgery” refers to radiosurgery
-that does not use a metal frame to immobilize the
-head during treatment. Rather, markers able to be
-viewed on a scan are placed on the scalp, or a face
-mask is used to help hold the head steady. The
-treatment equipment is then aligned with the
-markers or with the face mask.
-Radiosurgery is different from Conventional Radiation therapy.
-Conventional external beam radiation therapy –
-the most common form of radiation therapy –
-delivers full dose radiation to the tumor and some
-of the surrounding brain tissue. For several
-reasons, the target area for conventional radiation
-deliberately includes a border (called a “margin”)
-of normal brain around the tumor. These reasons
-include uneven tumor borders, the risk of invisible
-spread of the tumor into the surrounding tissue, a
-larger tumor size, or the presence of multiple
-tumors. This larger zone of full-dose radiation
-includes the borders of the tumor where
-microscopic tumor cells may be located.
-Since normal brain tissue is included in the
-full-dose region, conventional radiation is broken
-down into small daily doses so the normal brain
-tissue can tolerate it. As a result, reaching the
-desired dose of radiation takes several weeks of
-daily treatment.
-Radiosurgery focuses radiation beams more
-closely to the tumor than conventional external
-beam radiation. This is possible through the use
-of highly sophisticated computer-assisted
-equipment. A head frame or facemask used for
-this treatment allows very precise set up,
-localization and treatment of the tumor. Using
-advanced computer planning, radiosurgery
-minimizes the amount of radiation received by
-normal brain tissue and focuses radiation in the
-area to be treated.
-Since conventional radiation therapy covers more
-normal tissue, it can often be given only once.
-Radiosurgery, however, may be considered for
-re-irradiation due to its precision and the
-possibility of avoiding previously treated areas
-'''Gamma knife, Linear Accelerators, Proton Beam radiosurgery units''' are the types of equipment used in Radiosurgery.  Radiosurgery requires a
-team of specialists. That team may include a
-neurosurgeon, radiation oncologist, radiologist,
-radiation physicist, neurologist, anesthesiologist,
-specially trained nurses, technologists and the unit
-support staff.The actual treatment time for any of these
-techniques generally ranges from 15 minutes to
-about two hours.
-Some people have few or no side
-effects from this type of radiation therapy. Once
-they have rested following the treatment and have
-resumed their regular activities, tenderness at the
-pin sites may be the only side effect
-Early symptoms are often due to brain edema
-(swelling) caused by the radiation. These
-symptoms can include nausea, vomiting, dizziness,
-or headaches which are usually temporary. Once the
-swelling resolves, these symptoms usually resolve.
-Two to three weeks after treatment, some may
-experience hair loss in the area radiated, but this
-does not occur in everyone. Hair loss depends on
-the dose of radiation received by portions of the
-scalp and the ability of the radiated hair follicles to
-heal. Regrowth usually begins in 3-4 months, and
-may be a slightly different color or texture than
-before. The scalp may also become temporarily
-irritated.
-Some patients may experience delayed reactions
-weeks or months after treatment. These reactions
-can include necrosis or cell death in the high
-radiation dose region due to swelling in reaction
-to the radiation effect on the target region. These
-symptoms are mainly due to swelling or death of
-brain tissue in the treated area. They may mimic
-the symptoms of tumor regrowth or stroke.
-Treatment will be based on the type of side effect
-that occurred. Other effects depend on the
-location of the tumor.