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Bexxar (Tositumomab / Iodine I 131 Tositumomab) - Summary



Hypersensitivity Reactions, including Anaphylaxis: Serious hypersensitivity reactions, including some with fatal outcome, have been reported with the BEXXAR therapeutic regimen. Medications for the treatment of severe hypersensitivity reactions should be available for immediate use. Patients who develop severe hypersensitivity reactions should have infusions of the BEXXAR therapeutic regimen discontinued and receive medical attention (see WARNINGS).

Prolonged and Severe Cytopenias: The majority of patients who received the BEXXAR therapeutic regimen experienced severe thrombocytopenia and neutropenia. The BEXXAR therapeutic regimen should not be administered to patients with >25% lymphoma marrow involvement and/or impaired bone marrow reserve (see WARNINGS and ADVERSE REACTIONS).

Pregnancy Category X: The BEXXAR therapeutic regimen can cause fetal harm when administered to a pregnant woman.

Special requirements: The BEXXAR therapeutic regimen (Tositumomab and Iodine I 131 Tositumomab) contains a radioactive component and should be administered only by physicians and other health care professionals qualified by training in the safe use and handling of therapeutic radionuclides. The BEXXAR therapeutic regimen should be administered only by physicians who are in the process of being or have been certified by GlaxoSmithKline in dose calculation and administration of the BEXXAR therapeutic regimen.



The BEXXAR therapeutic regimen (Tositumomab and Iodine I 131 Tositumomab) is an anti-neoplastic radioimmunotherapeutic monoclonal antibody-based regimen composed of the monoclonal antibody, Tositumomab, and the radiolabeled monoclonal antibody, Iodine I 131 Tositumomab.

The BEXXAR therapeutic regimen (Tositumomab and Iodine I 131 Tositumomab) is indicated for the treatment of patients with CD20 antigen-expressing relapsed or refractory, low grade, follicular, or transformed non-Hodgkin's lymphoma, including patients with Rituximab-refractory non-Hodgkin’s lymphoma. Determination of the effectiveness of the BEXXAR therapeutic regimen is based on overall response rates in patients whose disease is refractory to chemotherapy alone or to chemotherapy and Rituximab. The effects of the BEXXAR therapeutic regimen on survival are not known.

The BEXXAR therapeutic regimen is not indicated for the initial treatment of patients with CD20 positive non-Hodgkin’s lymphoma. (See ADVERSE REACTIONS, Immunogenicity.)

The BEXXAR therapeutic regimen is intended as a single course of treatment. The safety of multiple courses of the BEXXAR therapeutic regimen, or combination of this regimen with other forms of irradiation or chemotherapy, has not been evaluated.

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Media Articles Related to Bexxar (Tositumomab / Iodine I 131 Tositumomab)

Early results show response to new drug in patients with lymphomas and advanced solid tumours
Source: Cancer / Oncology News From Medical News Today [2014.11.21]
Patients with B-cell Non-Hodgkin lymphomas and advanced solid tumours have responded to a new drug that is being tested for the first time in humans in a phase I clinical trial.

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Canine lymphoma: new hope for beloved family pets
Source: Veterinary News From Medical News Today [2014.09.23]
Nearly one out of four dogs will develop cancer in their lifetime and 20 per cent of those will be lymphoma cases.

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Published Studies Related to Bexxar (Tositumomab / Iodine I 131 Tositumomab)

Tositumomab and iodine-131 tositumomab produces durable complete remissions in a subset of heavily pretreated patients with low-grade and transformed non-Hodgkin's lymphomas. [2005.10.20]
PURPOSE: This study is an integrated efficacy analysis of the five clinical trials of tositumomab and iodine-131 tositumomab in patients with relapsed or refractory low-grade, follicular, or transformed low-grade non-Hodgkin's lymphoma (NHL) that resulted in the regulatory approval of the iodine-131 tositumomab by the US Food and Drug Administration... CONCLUSION: The tositumomab and iodine-131 tositumomab therapeutic regimen produces high response rates in patients with relapsed or refractory low-grade, follicular, and transformed low-grade NHL, with a sizable subgroup of patients achieving long-term durable responses.

Six of 12 relapsed or refractory indolent lymphoma patients treated 10 years ago with 131I-tositumomab remain in complete remission. [2011.06]
The purpose of our study was to update the safety and efficacy results of radioimmunotherapy in relapsed or resistant indolent or transformed non-Hodgkin lymphoma... CONCLUSION: Optimal patient benefit might be obtained in indolent lymphoma when administering radioimmunotherapy up-front in combination with chemotherapy and rituximab treatment. However, these results show that radioimmunotherapy alone achieved long-lasting remissions in 6 of 12 (50%) indolent lymphoma patients in relapse after 1 or multiple chemotherapies.

Tositumomab and iodine I 131 tositumomab (Bexaar). [2011.04]
Tositumomab and iodine I 131 tositumomab (Bexaar) therapeutic regimen targets monoclonal antibodies against the CD20 antigen expressed in non-Hodgkin lymphoma. This article reviews the mechanism of action and clinical indications for this regimen..

Dosimetry in patients with B-cell lymphoma treated with [(90)Y]ibritumomab tiuxetan or [(131)I]tositumomab. [2011.04]
Radioimmunotherapy involves the use of radiolabeled monoclonal antibodies (MAbs) to treat malignancy.Moreover, we wish to point at the possibility of performing low-cost therapy bremsstrahlung imaging for [(90)Y]ibritumomab tiuxetan to confirm biodistribution, and possibly also for dosimetric calculations.

Predicting hematologic toxicity in patients undergoing radioimmunotherapy with 90Y-ibritumomab tiuxetan or 131I-tositumomab. [2010.12]
This study aimed at identifying clinical factors for predicting hematologic toxicity after radioimmunotherapy with (90)Y-ibritumomab tiuxetan or (131)I-tositumomab in clinical practice... CONCLUSION: The elapsed time since the last chemotherapy can be used to predict hematologic toxicity and customize the current dosing method in radioimmunotherapy.

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Clinical Trials Related to Bexxar (Tositumomab / Iodine I 131 Tositumomab)

Safety and Efficacy Study of I-131 Tositumomab in Patients With Relapsed/Refractory Hodgkin's Lymphoma [Recruiting]
The purpose of this study is to find the highest safe dose of Iodine-131 Tositumomab (Bexxar®) that can be given to patients who have relapsed/refractory Hodgkin's lymphoma, what side effects these patients get when they take Bexxar® and if Bexxar® is effective in treating relapsed/refractory Hodgkin's lymphoma. Bexxar® works by delivering doses of radiation to cancer cells.

Clinical Trial of Consolidation Treatment With Iodine I 131 Tositumomab for Multiple Myeloma [Recruiting]
This study is for patients with newly diagnosed or relapsed multiple myeloma. The main purpose of this study is to see how their disease responds to consolidation treatment (treatment aimed at further decreasing cancer cells) with a radioactive antibody (protein) called iodine I 131 tositumomab (known by the tradename Bexxar®) and also to look at the side effects which occur with this type of treatment. The investigators will also be looking at how long disease responds to treatment, if it responds at all, and how long patients who have had this treatment survive.

Bexxar is a monoclonal antibody (protein) to which radioactive iodine 131 is attached. The monoclonal antibody in Bexxar (tositumomab), targets a protein called CD20 found on the surface of a variety of B-cells, including lymphoma cells, and some myeloma cells. The antibody is given as an infusion and finds its way to these cells. The radioactive iodine attached to the antibody delivers radiation directly to these cells which works to harm or kill the cancer cells. Approximately 20-25% of patients with multiple myeloma have this protein on the surface of their tumor cells. In addition, this protein was found on the surface of myeloma stem cells. While myeloma stem cells represent a minority of all myeloma cells (less than 5%), these cells are resistant to chemotherapy and are believed to be responsible for a recurrence of the disease after chemotherapy. In this study, Bexxar will be used after patients complete a course of chemotherapy and have residual myeloma cells left in their body. The Investigators are hoping that the treatment with Bexxar will decrease and possibly eliminate residual myeloma cells resistant to chemotherapy.

Tositumomab and Iodine I 131 Tositumomab in Treating Patients With Chronic Lymphocytic Leukemia or Small Lymphocytic Lymphoma in First Remission [Recruiting]
This phase II trial studies how well tositumomab and iodine I 131 tositumomab works in treating patients with chronic lymphocytic leukemia (CLL) or small lymphocytic lymphoma (SLL) in first remission. Monoclonal antibodies, such as tositumomab and iodine I 131 tositumomab, can block cancer growth in different ways. Some block the ability of cancer to grow and spread. Others find cancer cells and help kill them or carry cancer cancer-killing substances to them

Safety and Efficacy of Bexxar Therapy in the Treatment of Relapsed/Residual B-Cell Lymphoma After Autologous Transplant [Recruiting]
Patients with B-cell lymphoma who relapse after autologous transplant tend to have a poor prognosis. Currently, there is no standard treatment for such patients. Bexxar is a radioactive antibody therapy that has shown a 60-80% response rate in non-transplanted patients with relapsed B-cell lymphoma. This study will test the safety and efficacy of Bexxar in the treatment of patients whose B-cell lymphoma has relapsed after an autologous transplant.

Iodine I 131 Tositumomab and Fludarabine Phosphate in Treating Older Patients Who Are Undergoing an Autologous or Syngeneic Stem Cell Transplant for Relapsed or Refractory Non-Hodgkin's Lymphoma [Recruiting]
RATIONALE: Radiolabeled monoclonal antibodies, such as iodine I 131 tositumomab, can find cancer cells and carry cancer-killing substances to them without harming normal cells. Drugs used in chemotherapy, such as fludarabine phosphate, work in different ways to stop the growth of cancer cells, either by killing the cells or by stopping them from dividing. A peripheral stem cell transplant may be able to replace blood-forming cells that were destroyed by chemotherapy and radiation therapy. Giving iodine I 131 tositumomab together with fludarabine phosphate followed by autologous stem cell transplant may be an effective treatment for non-Hodgkin's lymphoma.

PURPOSE: This phase I trial is studying the side effects and best dose of fludarabine when given together with iodine I 131 tositumomab in treating older patients who are undergoing an autologous or syngeneic stem cell transplant for relapsed or refractory B-cell non-Hodgkin's lymphoma.

more trials >>

Page last updated: 2014-11-21

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