Malignant Bone Marrow Plasma Cell Tumor in Dogs (Multiple Myeloma)
- Occurrence: very rare
- Location of disease: General/Whole body
When to visit the vet?
Non-urgent see a veterinarian within 2–3 days
If the condition worsens / symptoms persist, consult a veterinarian.
Definition
Multiple myeloma is a malignant cancer of the bone marrow in dogs, characterized by the uncontrolled proliferation of plasma cells. These cells are part of the immune system and normally produce antibodies, but in multiple myeloma, abnormal, non-functional antibodies are created, which can lead to various health problems.
Das Wichtigste auf einen Blick
Multiple myeloma is a form of bone marrow cancer in dogs involving the uncontrolled proliferation of plasma cells that produce antibodies. The exact cause is not fully understood, but genetic and environmental factors as well as chronic Inflammatory conditions may play a role. This disease leads to the production of monoclonal proteins that damage organs such as the kidneys, cause coagulopathies, and can weaken the immune system. Symptoms include Pain, Lameness, weakness, Fever, Respiratory distress, and a tendency to bleed. Diagnosis is made through clinical examinations, blood tests, electrophoresis, and imaging procedures such as X-rays. A bone marrow biopsy may be required for confirmation.
Treatment includes chemotherapy, supportive care, and symptomatic treatments to control the growth of cancer cells. Medications such as melphalan and prednisone are frequently used, and bisphosphonates can help support bone health. The prognosis depends on the stage of the disease and treatment efficiency, with survival time typically between 12 and 18 months. Since the causes are not fully known, there are no specific prevention measures; however, regular veterinary examinations can help detect the disease early.
Current research focuses on the genetic and molecular mechanisms that cause multiple myeloma in dogs, as well as new treatment methods such as immunotherapies. The goal is to develop personalized medicine to make treatment more effective and minimize side effects.
Ursachen
The bone marrow is the tissue inside the bones where blood cells, including plasma cells, are formed. Plasma cells are a type of white blood cell that originate from B-lymphocytes and are responsible for the production of antibodies. In multiple myeloma, a clonal expansion of these cells occurs, meaning that a single cell grows and multiplies uncontrollably.
The exact cause of multiple myeloma in dogs is not fully understood. It is believed that genetic factors may play a role, as certain dog breeds are more frequently affected. Environmental factors and chronic Inflammatory conditions could also contribute to the development of the disease.
An important aspect of the pathogenesis of multiple myeloma is the production of monoclonal proteins (paraproteins), which circulate in the blood and can damage various organs. These proteins can impair normal kidney function, lead to blood clotting disorders, and weaken the immune system.
Symptoms
The symptoms of multiple myeloma in dogs are often non-specific and can vary depending on the affected organ. The most common signs include Lethargy, weakness, and loss of appetite. Dogs may also drink and urinate excessively, which indicates kidney involvement.
Bone pain and Lameness are also common, as the abnormal cells in the bone marrow can damage the surrounding bone tissue, which can lead to fractures. In addition, blood clotting disorders can occur, manifesting as Bleeding or bruising.
Some dogs develop neurological symptoms such as weakness or Paralysis if the disease spreads to the nervous system. Eye symptoms such as retinal detachment can also occur if blood flow to the eyes is disrupted.
Diagnose
The diagnosis of multiple myeloma in dogs requires a combination of clinical examinations, blood tests, and imaging procedures. A blood count can reveal anemia, thrombocytopenia, or an increased number of white blood cells. A biochemical profile can detect kidney dysfunction and elevated calcium levels in the blood.
Serum or urine electrophoresis tests are used to identify the presence of monoclonal proteins. These tests can detect abnormal antibodies produced by plasma cells. A bone marrow biopsy is often required to confirm the diagnosis and determine the number of plasma cells and myeloma cells.
Imaging procedures such as X-rays, ultrasound, or MRI can help detect bone lesions, tumor growth, or organ involvement. These examinations are important for determining the extent of the disease and the affected areas.
Therapie
Treatment of multiple myeloma in dogs usually includes a combination of chemotherapy, supportive care, and symptomatic therapy. Chemotherapeutic drugs such as melphalan and prednisone are frequently used agents that can inhibit the growth of cancer cells and reduce their number.
Additionally, treatment with bisphosphonates can help support bone health and relieve Pain. These medications work by inhibiting Bone resorption and improving bone strength.
Symptomatic treatments may include the administration of painkillers, the correction of anemia, or the treatment of kidney failure. Regular monitoring of blood cells and organ functions is also important to observe the course of the disease and adjust the therapy accordingly.
Prognose und Nachsorge
The prognosis for dogs with multiple myeloma varies considerably and depends on several factors, including the stage of the disease, the response to treatment, and the presence of complications. In general, the disease can be controlled with appropriate therapy, but it is considered incurable.
The median survival time after diagnosis is typically between 12 and 18 months, but it can be shorter or longer depending on the individual response to treatment. Early diagnosis and a well-coordinated treatment plan can significantly improve quality of life and extend survival time.
Prävention
Since the exact causes of multiple myeloma in dogs are not fully understood, there are no specific prevention measures that can reliably prevent the development of the disease. However, general health monitoring and regular veterinary examinations can help detect and treat the disease early.
A balanced diet rich in antioxidants could reduce the risk of cancer, although there are no specific dietary recommendations for the prevention of multiple myeloma. Regular exercise and a healthy body weight can also contribute to the dog’s general health and well-being.
Avoiding known environmental toxins and carcinogens whenever possible can also be an important step in reducing overall cancer risk. This includes minimizing exposure to pesticides, certain chemicals, and tobacco smoke.
Ausblick auf aktuelle Forschung
Multiple myeloma is a rare but significant disease in dogs that affects the bone marrow. Current research focuses on better understanding the genetic and molecular mechanisms involved in the development of this disease. Of great interest is the area of identifying genetic predispositions that could make certain dog breeds more susceptible to multiple myeloma. By understanding these genetic factors, scientists hope to develop better diagnostic tools and targeted therapies.
Another research focus is the development of new treatment methods. Traditionally, chemotherapy and radiation therapy have been used to treat multiple myeloma, but new approaches such as immunotherapeutic treatments are currently being investigated. These therapies aim to strengthen the dog’s immune system to fight cancer cells more effectively. Initial studies have shown that immunotherapies have the potential to slow the progression of the disease and improve the quality of life for affected dogs.
Additionally, researchers are working to identify biomarkers that allow for the early detection of multiple myeloma. Currently, this disease is often only diagnosed at an advanced stage because the symptoms can be non-specific. By developing blood tests or other non-invasive methods for early detection, veterinarians could diagnose and treat the disease at an earlier stage, which could significantly improve the prognosis.
In the long term, research aims to develop personalized medicine for dogs with multiple myeloma. This would mean that treatment is tailored to the specific genetic and molecular characteristics of each individual dog’s tumor. Such personalized approaches could increase the effectiveness of treatment and minimize side effects.
Research into multiple myeloma in dogs is still in its early stages, but the progress made so far is promising. With the increasing availability of advanced genetic analysis techniques and collaboration between veterinarians and oncologists, there is hope that significant breakthroughs can be achieved in the near future that will improve the lives of dogs with this disease.
Frequently Asked Questions (FAQs)
1. What is multiple myeloma?
2. What symptoms occur in dogs with multiple myeloma?
3. How is multiple myeloma diagnosed in dogs?
4. What treatment options are available for dogs with multiple myeloma?
5. Is multiple myeloma in dogs curable?
6. Which dog breeds are particularly susceptible to multiple myeloma?
7. How common is multiple myeloma in dogs?
8. Can multiple myeloma be prevented in dogs?
9. What role does nutrition play for dogs with multiple myeloma?
10. How can I help my dog with multiple myeloma?
Literatur
- Moore, A. R. (2023). Diagnosing multiple myeloma and related disorders. Veterinary Clinics of North America: Small Animal Practice, 53(1), 101–120. https://doi.org/10.1016/j.cvsm.2022.07.009
- Moore, A. R., Harris, A., Jeffries, C., Avery, P. R., & Vickery, K. (2021). Retrospective evaluation of the use of the International Myeloma Working Group response criteria in dogs with secretory multiple myeloma. Journal of Veterinary Internal Medicine, 35(1), 442–450. https://doi.org/10.1111/jvim.15967
- Fernández, R., & Chon, E. (2018). Comparison of two melphalan protocols and evaluation of outcome and prognostic factors in multiple myeloma in dogs. Journal of Veterinary Internal Medicine, 32(3), 1060–1069. https://doi.org/10.1111/jvim.15084
- Hõim, S.-E., Fitzgerald, E., Mapletoft, E., & Purzycka, K. (2023). Computed tomographic findings in dogs with multiple myeloma. Veterinary Medicine and Science, 9(2), 660–669. https://doi.org/10.1002/vms3.1019
- Caldin, M., Campigli, M., Zoia, A., Zanella, A., Bertolini, G., Furlanello, T., & Lubas, G. (2019). Bleeding diathesis in canine multiple myeloma and prognostic implications: A cohort study in 156 dogs. Research in Veterinary Science, 125, 305–308. https://doi.org/10.1016/j.rvsc.2019.07.006
- Giraudel, J. M., Pagès, J. P., & Guelfi, J. F. (2002). Monoclonal gammopathies in the dog: A retrospective study of 18 cases (1986–1999) and literature review. Journal of the American Animal Hospital Association, 38(2), 135–147. https://doi.org/10.5326/0380135
- Valente, P. C. L. G., Peleteiro, M. C., Pissarra, H., Vicente, G., Correia, J., Pomba, C., & Duarte, A. (2024). Multiple myeloma in dogs: Use of the cell block technique as a new diagnostic tool. Veterinary Clinical Pathology, 53(1), 93–98. https://doi.org/10.1111/vcp.13320