Treatment and Prevention
Brain cancers are usually treated with a combination of surgery, chemotherapy (anti-cancer drugs), and radiation as well as medications that control symptoms. High doses of steroids are frequently used to reduce any swelling caused by the tumor. These will often relieve some or all of the symptoms but have no effect on the tumor itself. Anticonvulsant medications may be used to prevent seizures.
Surgery is done to remove as much of the cancer as possible. Some brain cancers are located in areas that surgeons can't reach without damaging other important portions of the brain. It's often better not to operate in those cases. Even when surgery can't completely remove all of the cancer, it can make the tumor smaller which helps relieve some of the symptoms and can make other treatments more effective.
Radiation is usually started after surgery. It often doesn't cure brain cancer, but it can keep the tumor under control for months or even years. Some types of brain cancers may respond to chemotherapy. A variety of different drugs are available or are being tested.
Treatment of metastatic cancers (those that have spread) largely depends on the location where they started. For example, a lung cancer that metastasized to the brain would be treated the same way as other lung cancers. The part of the cancer that has spread to the brain may be treated by radiation. If the cancer has metastasized but is limited to one area in the brain, it is sometimes removed surgically.
Advances in technology are providing new treatment options such as lasers and ultrasound for removing tumors. An alternative to surgery is a new technique called "Gamma knife" stereotactic radiosurgery, where radiation beams are accurately focused directly on the tumor. These newer techniques may leave fewer cancer cells behind and minimize the damage to the healthy brain tissue around the tumor, resulting in fewer neurological complications.
It is usually not possible to get rid of all the brain cancer cells. If even a few are left behind, the cancer can grow back. Experimental treatments such as radioactive implants (which are implanted inside tumors) and certain new kinds of immune therapy or gene therapy provide hope for better treatment of brain cancers in the future.