Ependymoma treatment focuses on removing the tumor and preventing its return, combining surgery, radiation, and other therapies tailored to each patient’s unique situation and tumor characteristics.

How Treatment Decisions Are Made for Ependymoma

When someone is diagnosed with ependymoma, the path forward depends on many factors working together. The main goal of treatment is to remove as much of the tumor as possible while protecting surrounding brain or spinal cord tissue. Doctors also aim to reduce symptoms, prevent the tumor from returning, and help patients maintain the best possible quality of life^[1].

Treatment decisions are shaped by several important considerations. The tumor’s location matters greatly — whether it sits in the brain or spinal cord makes a significant difference in how doctors approach it. The tumor’s grade, which describes how quickly the cells are growing and how abnormal they appear under a microscope, also guides treatment choices. Grades range from 1 to 3, with grade 1 tumors growing slowly and grade 3 tumors growing aggressively^[2].

Patient characteristics play a crucial role too. Age is particularly important because ependymomas affect both children and adults, though they behave differently in each group. A patient’s overall health, ability to tolerate treatments, and presence of other medical conditions all influence what therapies are recommended. The amount of tumor that can be safely removed during surgery often determines whether additional treatments will be necessary^[3].

Modern medicine recognizes that ependymomas are not a single disease but rather a family of related tumors with distinct molecular features — specific genetic changes within the tumor cells. These molecular patterns help doctors understand how the tumor might behave and sometimes guide treatment decisions. The 2021 World Health Organization classification system now groups ependymomas based on their location, appearance, and molecular characteristics, creating a more precise roadmap for treatment^[3].

Standard Treatment Approaches

Surgery as the Foundation

Surgery remains the cornerstone of ependymoma treatment. A specialized brain surgeon, called a neurosurgeon, performs an operation to remove as much of the tumor as safely possible. The main objective is achieving what doctors call a “gross total resection,” which means removing the entire visible tumor. This is critically important because patients whose tumors are completely removed tend to have better outcomes than those with partial removal^[9].

However, complete removal is not always achievable. Ependymomas often grow near or within delicate structures in the brain and spinal cord. Removing too much tissue could cause serious problems with movement, sensation, speech, or other vital functions. In these situations, surgeons remove as much tumor as they can while preserving important brain or spinal cord function. The surgery also provides tissue samples that allow specialists called neuropathologists to examine the tumor cells under a microscope and determine the exact diagnosis^[3].

For tumors in the brain, the surgeon typically performs a craniotomy, which involves opening part of the skull to access the tumor. For spinal tumors, the approach depends on exactly where the tumor is located along the spine. Recovery from surgery can take several weeks, and patients often need rehabilitation to regain strength and function^[5].

Some patients may need more than one surgery, especially if the tumor returns or if not all of it could be removed during the first operation. Even when surgery is successful at removing visible tumor, microscopic tumor cells may remain, which is why additional treatments are often recommended^[11].

Radiation Therapy

Radiation therapy uses high-energy X-rays or other forms of radiation to destroy tumor cells or stop them from growing. This treatment is commonly recommended after surgery, particularly when the tumor could not be completely removed or when there is concern about tumor cells that may have spread through the cerebrospinal fluid — the liquid that surrounds and cushions the brain and spinal cord^[2].

The radiation is carefully targeted to the area where the tumor was located, and sometimes to the surrounding region to catch any remaining tumor cells. Treatment typically occurs daily, five days a week, for several weeks. Each session lasts only a few minutes and is painless during the procedure itself^[9].

For certain tumors, especially higher-grade ependymomas or those that have spread to multiple areas, doctors may recommend radiation to the entire brain and spinal cord. This more extensive approach aims to eliminate tumor cells that might have traveled through the cerebrospinal fluid to other locations. However, this broader radiation field can cause more side effects^[7].

Side effects of radiation therapy can appear during treatment or develop months to years later. Short-term effects may include fatigue, skin changes in the treatment area, hair loss, and nausea. Long-term effects depend on the area treated and the dose used, but can include changes in brain function, hormone imbalances, growth problems in children, and increased risk of developing other tumors later in life. Doctors carefully weigh these potential risks against the benefits of controlling the tumor^[11].

A specialized form of radiation called radiosurgery or stereotactic radiosurgery delivers very focused, high-dose radiation in one or a few sessions. Despite its name, it does not involve cutting. This approach may be used for small, well-defined tumors or for tumors that return after initial treatment^[9].

Chemotherapy

Chemotherapy involves using medications to kill cancer cells or stop them from growing. Unlike radiation, which is a local treatment targeting specific areas, chemotherapy travels throughout the entire body via the bloodstream. For ependymomas, chemotherapy is used less commonly than surgery and radiation, and its role remains somewhat limited^[2].

Chemotherapy may be recommended in several situations. For young children, doctors sometimes use chemotherapy to delay radiation therapy, giving the child’s brain more time to develop before exposure to radiation. Chemotherapy may also be tried when tumors return after initial treatment, especially if further surgery or radiation are not good options. In rare cases where the tumor has spread beyond the central nervous system, chemotherapy becomes more important^[10].

Several chemotherapy drugs have been tested in ependymoma, but none have shown consistent, strong effectiveness. The drugs used may include platinum-based agents, alkylating agents, or combinations of multiple drugs. Treatment might be given through an intravenous line or sometimes as pills taken by mouth. The duration of chemotherapy varies but typically involves multiple cycles over several months^[15].

Side effects of chemotherapy depend on which drugs are used but commonly include nausea, vomiting, hair loss, fatigue, increased risk of infection due to low blood cell counts, and mouth sores. Most of these effects are temporary and improve after treatment ends. Doctors provide supportive medications to help manage these side effects and monitor patients closely during treatment^[11].

Observation and Monitoring

For some slow-growing, low-grade ependymomas that are not causing symptoms, careful observation without immediate treatment may be appropriate. This is particularly true for certain subependymomas — grade 1 tumors that may be discovered incidentally during scans done for other reasons. These tumors may remain stable for years without growing or causing problems^[8].

Observation involves regular monitoring with imaging scans, typically MRI, every few months initially and then less frequently if the tumor remains stable. If the tumor begins to grow or causes symptoms, treatment can be started at that time. This approach avoids the risks of surgery and other treatments when they may not be necessary^[6].

Treatment in Clinical Trials

While standard treatments help many patients, ependymomas can be challenging tumors, especially when they return after initial treatment. Researchers around the world are testing new approaches in clinical trials — carefully controlled research studies that evaluate promising new treatments. These trials offer hope for better outcomes and are essential for advancing our understanding of how to treat ependymoma^[4].

Understanding Clinical Trial Phases

Clinical trials proceed through a series of phases, each designed to answer specific questions about a new treatment. Phase I trials test whether a treatment is safe and determine the best dose to use. These early studies usually involve small numbers of patients and focus primarily on safety rather than whether the treatment works^[4].

Phase II trials evaluate whether the treatment shows signs of effectiveness against the tumor. These studies involve more patients and begin to measure outcomes like whether tumors shrink, how long patients survive without the tumor growing, and what side effects occur. Phase II trials help researchers decide whether a treatment is promising enough to test in larger studies^[4].

Phase III trials compare the new treatment directly to the current standard treatment or to a placebo. These large studies, sometimes involving hundreds of patients, provide the strongest evidence about whether a new treatment is better than existing options. Patients are typically assigned randomly to receive either the new treatment or the standard treatment, which helps ensure fair comparison^[4].

Targeted Therapies Under Investigation

One exciting area of research involves targeted therapies — drugs designed to attack specific molecular abnormalities within tumor cells. Scientists have discovered that certain ependymomas have particular genetic changes that drive their growth. Developing drugs that specifically target these changes might offer more effective treatment with fewer side effects than traditional chemotherapy^[11].

For example, some ependymomas in the upper part of the brain have a genetic change called RELA fusion (now termed ZFTA fusion in the newest classification). This abnormality causes the tumor cells to produce too much of a protein that promotes cell growth. Researchers are testing drugs that might block this pathway and stop tumor growth. While these approaches are still in early testing phases, they represent a new direction in treatment^[3].

Other targeted approaches focus on growth factor pathways, which are the signals that tell cells when to grow and divide. Tumors often hijack these pathways to fuel their uncontrolled growth. Drugs that interfere with these signals are being evaluated in various clinical trials for ependymoma^[11].

Immunotherapy Approaches

Immunotherapy represents another frontier in cancer treatment. These treatments work by helping the patient’s own immune system recognize and attack tumor cells. The immune system normally protects the body from foreign invaders like bacteria and viruses, but cancer cells can hide from immune detection. Immunotherapy aims to unmask the tumor cells or boost the immune response against them^[2].

Several types of immunotherapy are being explored for ependymoma. Checkpoint inhibitors are drugs that release the brakes on the immune system, allowing immune cells to attack tumors more effectively. Cancer vaccines aim to train the immune system to recognize specific proteins found on tumor cells. These approaches are still being studied and are available primarily through clinical trials^[17].

Novel Radiation Techniques

Researchers continue to refine radiation therapy techniques to improve effectiveness while reducing side effects. Proton beam therapy uses protons instead of traditional X-rays. Protons can be controlled more precisely, delivering radiation to the tumor while sparing more of the surrounding normal tissue. This precision is particularly valuable for tumors near critical brain structures or in children, where protecting the developing brain is essential^[11].

Studies are comparing proton beam therapy to standard photon radiation to determine whether this newer technique improves outcomes or reduces long-term side effects. These trials are being conducted at specialized centers that have the equipment needed for proton therapy^[15].

Combination Approaches

Many current trials test combinations of treatments rather than single therapies alone. For example, researchers are evaluating whether adding targeted drugs or immunotherapy to standard radiation improves outcomes. Some studies test new chemotherapy combinations or new ways to deliver chemotherapy directly to the tumor site rather than through the bloodstream^[11].

Who Can Participate in Clinical Trials

Eligibility for clinical trials depends on many factors. Trials usually have specific requirements regarding the patient’s age, type and grade of ependymoma, whether it is newly diagnosed or recurrent, previous treatments received, and overall health status. Some trials are only for children, others only for adults, and some accept both^[4].

Clinical trials are conducted at medical centers around the world, including in the United States, Europe, and other regions. Patients interested in clinical trials should discuss options with their doctors, who can help identify appropriate studies and explain the potential benefits and risks. Organizations dedicated to ependymoma research and patient support often maintain databases of available trials^[17].

Treatment for Specific Situations

Managing Recurrent Ependymoma

Despite initial treatment, ependymomas can return, sometimes years after the first diagnosis. When tumors recur, they may come back in the same location or appear in different areas of the brain or spinal cord. Treatment decisions for recurrent ependymoma depend on where the tumor returned, what treatments were used initially, how much time passed before recurrence, and the patient’s overall condition^[9].

Surgery is often considered again if the recurrent tumor is accessible and can be safely removed. For patients whose tumors return after initial surgery and radiation, additional radiation may be possible depending on how much radiation was given before and where the new tumor is located. Re-irradiation requires careful planning to avoid exceeding safe radiation doses to normal tissues^[11].

Chemotherapy becomes more important for recurrent tumors, particularly when additional surgery or radiation are not good options. Clinical trials of new treatments may also be especially appropriate for patients with recurrent disease, as standard treatments have already been tried^[11].

Treatment Based on Tumor Location

Spinal ependymomas, particularly the slow-growing myxopapillary ependymoma subtype that typically occurs at the lower end of the spinal cord, may be treated somewhat differently than brain ependymomas. Surgery is still the primary treatment, and if complete removal is achieved, patients may not need radiation. These spinal tumors often have better outcomes than brain ependymomas, though they can still recur^[4].

For tumors in the upper part of the brain (supratentorial location), treatment approaches vary based on the tumor’s molecular features. Recent research has identified specific genetic patterns in these tumors that may influence how aggressive the tumor behaves and how it might respond to different treatments^[3].

Ependymomas in the back part of the brain (posterior fossa), which are common in children, also have distinct molecular subtypes. These subtypes help doctors predict which tumors are more likely to grow back and which patients might need more aggressive treatment^[15].

Most Common Treatment Methods

• Surgery
  • Neurosurgeons remove as much tumor as possible while preserving brain or spinal cord function
  • Complete tumor removal when achievable offers the best outcomes
  • Provides tissue for diagnosis and molecular testing
  • May need to be repeated if tumor returns
• Radiation Therapy
  • Uses high-energy X-rays to destroy remaining tumor cells after surgery
  • Typically given daily over several weeks
  • May target just the tumor area or the entire brain and spinal cord depending on tumor spread
  • Radiosurgery delivers focused high-dose radiation in fewer sessions
  • Proton beam therapy offers more precise radiation delivery in specialized centers
• Chemotherapy
  • Medications that kill cancer cells or stop their growth
  • Used more often in children to delay radiation or for recurrent tumors
  • May include platinum-based drugs, alkylating agents, or drug combinations
  • Given through intravenous lines or as oral medications
• Targeted Therapy (in clinical trials)
  • Drugs designed to attack specific molecular abnormalities in tumor cells
  • Targets pathways like ZFTA fusion or growth factor signaling
  • Aims for more effective treatment with fewer side effects
  • Still being tested in research studies
• Immunotherapy (in clinical trials)
  • Treatments that help the immune system recognize and attack tumor cells
  • Includes checkpoint inhibitors and cancer vaccines
  • Available primarily through clinical trial participation