user: What are the treatments for Primary CNS Lymphoma ?

assistant: Key Points
                    - There are different types of treatment for patients with primary CNS lymphoma.     - Three standard treatments are used:         - Radiation therapy      - Chemotherapy      -  Steroid therapy        - New types of treatment are being tested in clinical trials.         - High-dose chemotherapy with stem cell transplant     - Targeted therapy        - Patients may want to think about taking part in a clinical trial.    - Patients can enter clinical trials before, during, or after starting their cancer treatment.    - Follow-up tests may be needed.
                
                
                    There are different types of treatment for patients with primary CNS lymphoma.
                    Different types of treatment are available for patients with primary central nervous system (CNS) lymphoma. Some treatments are standard (the currently used treatment), and some are being tested in clinical trials. A treatment clinical trial is a research study meant to help improve current treatments or obtain information on new treatments for patients with cancer. When clinical trials show that a new treatment is better than the standard treatment, the new treatment may become the standard treatment. Patients may want to think about taking part in a clinical trial. Some clinical trials are open only to patients who have not started treatment.     Surgery is not used to treat primary CNS lymphoma.
                
                
                    Three standard treatments are used:
                    Radiation therapy      Radiation therapy is a cancer treatment that uses high-energy x-rays or other types of radiation to kill cancer cells or keep them from growing. There are two types of radiation therapy:            -  External radiation therapy uses a machine outside the body to send radiation toward the cancer. Because primary CNS lymphoma spreads throughout the brain, external radiation therapy is given to the whole brain. This is called whole brain radiation therapy.     -  Internal radiation therapy uses a radioactive substance sealed in needles, seeds, wires, or catheters that are placed directly into or near the cancer.           The way the radiation therapy is given depends on whether the patient has primary CNS lymphoma and AIDS. External radiation therapy is used to treat primary CNS lymphoma.     High-dose radiation therapy to the brain can damage healthy tissue and cause disorders that can affect thinking, learning, problem solving, speech, reading, writing, and memory. Clinical trials have tested the use of chemotherapy alone or before radiation therapy to reduce the damage to healthy brain tissue that occurs with the use of radiation therapy.       Chemotherapy     Chemotherapy is a cancer treatment that uses drugs to stop the growth of cancer cells, either by killing the cells or by stopping them from dividing. When chemotherapy is taken by mouth or injected into a vein or muscle, the drugs enter the bloodstream and can reach cancer cells throughout the body (systemic chemotherapy). When chemotherapy is placed directly into the cerebrospinal fluid (intrathecal chemotherapy), an organ, or a body cavity such as the abdomen, the drugs mainly affect cancer cells in those areas (regional chemotherapy).     The way the chemotherapy is given depends on where the tumor is in the CNS or eye. Primary CNS lymphoma may be treated with systemic chemotherapy, intrathecal chemotherapy and/or intraventricular chemotherapy, in which anticancer drugs are placed into the ventricles (fluid -filled cavities) of the brain. If primary CNS lymphoma is found in the eye, anticancer drugs are injected directly into the vitreous humor (jelly-like substance) inside the eye.     A network of blood vessels and tissue, called the blood-brain barrier, protects the brain from harmful substances. This barrier can also keep anticancer drugs from reaching the brain. In order to treat CNS lymphoma, certain drugs may be used to make openings between cells in the blood-brain barrier. This is called blood-brain barrier disruption. Anticancer drugs infused into the bloodstream may then reach the brain.         Steroid therapy     Steroids are hormones made naturally in the body. They can also be made in a laboratory and used as drugs. Glucocorticoids are steroid drugs that have an anticancer effect in lymphomas.
                
                
                    New types of treatment are being tested in clinical trials.
                    This summary section describes treatments that are being studied in clinical trials. It may not mention every new treatment being studied. Information about clinical trials is available from the NCI website.     High-dose chemotherapy with stem cell transplant     High-dose chemotherapy with stem cell transplant is a method of giving high doses of chemotherapy and replacing blood -forming cells destroyed by the cancer treatment. Stem cells (immature blood cells) are removed from the blood or bone marrow of the patient or a donor and are frozen and stored. After the chemotherapy is completed, the stored stem cells are thawed and given back to the patient through an infusion. These reinfused stem cells grow into (and restore) the body's blood cells.       Targeted therapy     Targeted therapy is a type of treatment that uses drugs or other substances to attack cancer cells. Targeted therapies usually cause less harm to normal cells than chemotherapy or radiation therapy do. Monoclonal antibody therapy is one type of targeted therapy being studied in the treatment of primary CNS lymphoma.    Monoclonal antibody therapy is a cancer treatment that uses antibodies made in the laboratory from a single type of immune system cell. These antibodies can identify substances on cancer cells or normal substances that may help cancer cells grow. The antibodies attach to the substances and kill the cancer cells, block their growth, or keep them from spreading. Monoclonal antibodies are given by infusion. They may be used alone or to carry drugs, toxins, or radioactive material directly to cancer cells. Rituximab is a type of monoclonal antibody used to treat newly diagnosed primary CNS lymphoma in patients who do not have AIDS.
                
                
                    Patients may want to think about taking part in a clinical trial.
                    For some patients, taking part in a clinical trial may be the best treatment choice. Clinical trials are part of the cancer research process. Clinical trials are done to find out if new cancer treatments are safe and effective or better than the standard treatment.   Many of today's standard treatments for cancer are based on earlier clinical trials. Patients who take part in a clinical trial may receive the standard treatment or be among the first to receive a new treatment.   Patients who take part in clinical trials also help improve the way cancer will be treated in the future. Even when clinical trials do not lead to effective new treatments, they often answer important questions and help move research forward.
                
                
                    Patients can enter clinical trials before, during, or after starting their cancer treatment.
                    Some clinical trials only include patients who have not yet received treatment. Other trials test treatments for patients whose cancer has not gotten better. There are also clinical trials that test new ways to stop cancer from recurring (coming back) or reduce the side effects of cancer treatment.   Clinical trials are taking place in many parts of the country. See the Treatment Options section that follows for links to current treatment clinical trials. These have been retrieved from NCI's listing of clinical trials.
                
                
                    Follow-up tests may be needed.
                    Some of the tests that were done to diagnose the cancer or to find out the stage of the cancer may be repeated. Some tests will be repeated in order to see how well the treatment is working. Decisions about whether to continue, change, or stop treatment may be based on the results of these tests.   Some of the tests will continue to be done from time to time after treatment has ended. The results of these tests can show if your condition has changed or if the cancer has recurred (come back). These tests are sometimes called follow-up tests or check-ups.
                
                
												            Treatment Options for Primary CNS Lymphoma
												            
												                
												                    Primary CNS Lymphoma Not Related to AIDS
												                    Treatment of primary central nervous system (CNS) lymphoma in patients who do not have AIDS may include the following:         -  Whole brain radiation therapy.    -  Chemotherapy.    - Chemotherapy followed by radiation therapy.    - Chemotherapy and targeted therapy (rituximab) followed by high-dose chemotherapy and stem cell transplant.    - A clinical trial of high-dose chemotherapy with stem cell transplant.    - A clinical trial of high-dose chemotherapy and targeted therapy (rituximab), with or without stem cell transplant or whole brain radiation therapy.
												                
												                
												                    Primary CNS Lymphoma Related to AIDS
												                    Treatment of primary central nervous system (CNS) lymphoma in patients who do have AIDS may include the following:         -  Whole brain radiation therapy.    -  Chemotherapy followed by radiation therapy.        Treatment of primary CNS lymphoma is different in patients with AIDS because the treatment side effects may be more severe. (See the PDQ summary on AIDS-Related Lymphoma Treatment for more information).
												                
												                
												                    Primary Intraocular Lymphoma
												                    Treatment of primary intraocular lymphoma may include the following:         -  Chemotherapy (intraocular or systemic).    -  Whole brain radiation therapy.
												                
												                
												                    Recurrent Primary CNS Lymphoma
												                    Treatment of recurrent primary central nervous system (CNS) lymphoma may include the following:         -  Chemotherapy.    -  Radiation therapy (if not received in earlier treatment).    - A clinical trial of a new drug or treatment schedule.