Cancer involves abnormal cells growing uncontrollably, invading nearby tissues, and spreading to other parts of the body through metastasis.
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The cornerstone of treatment for most primary brain tumors is surgery. The primary objective is “Maximal Safe Resection.” This means removing as much of the cancer as possible without causing new neurological deficits. Complete removal is often impossible for infiltrative gliomas because the tumor cells intermingle with normal brain cells, much like sand mixed into grass. However, “debulking” the tumor reduces the pressure in the skull, improves symptoms, and reduces the number of cancer cells that radiation and chemotherapy need to kill.
Technological advances have revolutionized neurosurgery. Neuronavigation enables the surgeon to visualize the instrument’s position on the patient’s MRI in real time. 5-ALA (5-aminolevulinic acid) is a dye that the patient drinks before surgery. It causes tumor cells to fluoresce (glow) pink under specific blue light in the microscope, helping the surgeon distinguish tumor from normal brain at the margins.
Awake Craniotomy is utilized when tumors are located in eloquent speech or motor areas. The patient is sedated for the opening but woken up during the tumor removal. A neuropsychologist tests the patient’s speech or movement while the surgeon stimulates the brain. If stimulation causes speech arrest or weakness, that area is spared. This functional mapping ensures the preservation of quality of life.
Radiation therapy uses high-energy photons or protons to damage the DNA of cancer cells, preventing them from dividing. It is standard for malignant tumors after surgery and for benign tumors that cannot be entirely removed. External Beam Radiation Therapy (EBRT) is typically delivered in fractions (daily small doses) over 3 to 6 weeks. This fractionation allows healthy brain tissue to repair itself between sessions while tumor cells, which have poor repair mechanisms, die.
Intensity-Modulated Radiation Therapy (IMRT) shapes the radiation beams to conform to the 3D shape of the tumor, sparing critical structures such as the optic nerves, brainstem, and hippocampus (a memory center). Proton Beam Therapy is a newer modality that uses protons instead of photons. Protons stop at a specific depth (the Bragg peak), delivering no exit dose to the healthy brain behind the tumor. This is particularly valuable in pediatric tumors to prevent long-term cognitive damage and secondary cancers.
Stereotactic Radiosurgery (SRS), often known by brand names like Gamma Knife or CyberKnife, delivers a single, extremely high dose of radiation to a small target with sub-millimeter accuracy. It is primarily used for brain metastases, meningiomas, and small recurrences. It acts like “knifeless surgery,” ablating the tumor in one session.
Chemotherapy for brain tumors is limited by the Blood-Brain Barrier (BBB). Most standard cancer drugs cannot cross it. The standard of care for Glioblastoma is Temozolomide (TMZ), an oral alkylating agent that can cross the BBB. It is typically given daily during radiation (concomitant phase) and then for 5 days every month afterwards (adjuvant phase). Its efficacy depends on the methylation status of the MGMT promoter; tumors with methylated MGMT cannot repair the damage caused by TMZ and thus respond better.
For Oligodendrogliomas, the PCV regimen (Procarbazine, Lomustine/CCNU, and Vincristine) is often used. Though more toxic than TMZ, it has shown durable responses in 1p/19q codeleted tumors. Lomustine is also used for recurrent glioblastoma.
Bevacizumab (Avastin) is a monoclonal antibody targeting VEGF. While it does not significantly extend survival, it is a potent agent for reducing cerebral edema (swelling) and sparing the use of steroids. It “normalizes” the leaky blood vessels, improving quality of life, but usually does not kill the tumor cells themselves. Carmustine wafers (Gliadel) are chemotherapy-impregnated polymers that can be placed directly into the surgical cavity after tumor removal to bypass the BBB.
Tumor Treating Fields (TTFields) represent a fourth modality of cancer treatment, distinct from surgery, radiation, or chemo. It is a non-invasive therapy involving a portable device (Optune) connected to adhesive transducer arrays placed on the patient’s shaved scalp. These arrays generate low-intensity, intermediate-frequency alternating electric fields.
The mechanism is biophysical. Cancer cells divide rapidly. During cell division (mitosis), charged proteins (like tubulin) must align to pull the cell apart. The electric fields disrupt this alignment, causing the cell to fail division and die (apoptosis). Because normal brain cells do not divide, they are largely unaffected.
Clinical trials have shown that adding TTFields to maintenance Temozolomide significantly extends survival in patients with Glioblastoma. The primary side effect is scalp skin irritation. Compliance is key; the device must be worn for at least 18 hours a day to be effective. It is currently FDA-approved for newly diagnosed and recurrent Glioblastoma.
Precision medicine is slowly entering neuro-oncology. For rare tumor subgroups with specific mutations, targeted drugs are available. BRAF inhibitors (Dabrafenib/Trametinib) are highly effective for BRAF V600E-mutated gliomas (often seen in younger adults or gangliogliomas). TRK inhibitors are used for tumors with NTRK fusions. mTOR inhibitors (Everolimus) are used for Subependymal Giant Cell Astrocytomas (SEGA) in Tuberous Sclerosis.
Immunotherapy, which has revolutionized melanoma and lung cancer, has faced challenges in the brain. Checkpoint inhibitors (PD-1 inhibitors like Pembrolizumab) have generally failed in large Glioblastoma trials, likely due to the “cold” (non-immunogenic) environment of the brain and the immunosuppressive effects of steroids. However, they are effective for brain metastases from melanoma or lung cancer.
Research is actively investigating CAR-T cell therapy, in which a patient’s own immune cells are engineered to recognize targets such as EGFRvIII or IL13Ra2 on glioblastoma cells. Oncolytic viruses (like modified Polio or Herpes viruses) are also being studied to infect and kill tumor cells while stimulating an immune response.
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It sounds scary, but it is a safe and painless procedure used when a tumor is near speech or movement areas. You are asleep while the surgeon opens the skull. Then, you are woken up (the brain feels no pain) to talk or move your hands while the surgeon maps the brain. This ensures the surgeon removes the tumor without cutting the parts of the brain you need to function.
External Beam Radiation (standard radiation) does not make you radioactive. The machine sends beams through you, but no radiation stays in your body. You are safe to hug children and family immediately after treatment. Only specific injected liquid radiation (like for thyroid cancer) makes you radioactive.
Temozolomide is generally better tolerated than many other chemotherapies. Common side effects include nausea (managed with anti-nausea meds), fatigue, and constipation. It can also lower your blood counts (platelets and white blood cells), so regular blood tests are needed to ensure it is safe to continue taking it.
Optune is a wearable device for the treatment of Glioblastoma. You shave your head and apply sticky patches (arrays) that create electric fields. These fields stop cancer cells from dividing. You wear it under a hat or scarf. It is not a drug, so it doesn’t make you sick, but you have to wear it for most of the day and night.
Gamma Knife (radiosurgery) is typically used for small tumors (usually less than 3-4 centimeters). If a tumor is too large, the high dose of radiation needed would damage the surrounding brain. Large tumors usually require surgery first to debulk them, or standard fractionated radiation given over several weeks.
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