Malignant Fibrous Histiocytoma (Giant Cell Tumor) bei Katzen

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Autorin: Dr. med. vet. Gisa Löwe | Zuletzt bearbeitet: 02.11.2025

Malignant Fibrous Histiocytoma (MFH), also known as Giant Cell Tumor, is a rare, aggressive form of soft tissue sarcoma that can occur in cats. These Tumors are characterized by a mixture of spindle cells and giant multinucleated cells.

Das Wichtigste auf einen Blick

Malignant Fibrous Histiocytoma (MFH) is a rare soft tissue Tumor in cats that arises from connective tissue. It shows a mixture of fibroblastic and histiocytic cells that proliferate uncontrollably. The exact causes are unclear, but genetic and environmental factors as well as chronic Inflammatory conditions may play a role. Symptoms include palpable nodules, loss of appetite, and Weight loss. Diagnosis is made by clinical examination, imaging procedures, and a biopsy. The preferred treatment is surgical removal; if removal is incomplete, radiation or chemotherapy may be considered. The prognosis depends heavily on the possibility of complete Tumor removal. A healthy lifestyle and regular veterinary visits can minimize the risk. Research on MFH in cats is investigating new diagnostic and treatment methods, including biomarkers and immunotherapies. International collaboration and the exchange of research results contribute to improving the understanding and treatment of this rare disease. The goal is to increase the survival rate and quality of life of affected cats.

Ursachen

Malignant Fibrous Histiocytoma belongs to a group of Tumors known as soft tissue sarcomas. These Tumors arise from the connective tissue, which is found in many tissues of the body. Soft tissue sarcomas are relatively rare in cats, and MFH accounts for only a small proportion of these cases.

Scientifically, MFH is defined by its histological structure, which shows a mixture of fibroblastic and histiocytic cells. Histiocytes are a type of immune cell that plays a role in the body’s response to infections and injuries. In MFH, however, these cells tend to proliferate uncontrollably and undergo malignant transformation.

The exact causes of MFH development in cats are not fully understood. As with many cancers, it is believed that a combination of genetic and environmental factors plays a role. Mutations in certain genes that regulate cell growth and division could contribute to the development of these Tumors.

Another possible factor is chronic Inflammatory conditions. Chronic Inflammatory conditions can lead to persistent cell damage and regeneration, which can increase the risk of Tumor development. It is suspected that environmental triggers such as chemicals, radiation, or viral infections could also increase the risk of developing MFH.

Symptome

The symptoms of Malignant Fibrous Histiocytoma in cats can vary depending on the location and size of the Tumor. Often, the Tumor is palpable as a solid, painless mass under the skin. These masses occur most often on the limbs, trunk, or in the abdominal area.

Because these Tumors can grow quickly, displacement or invasion of neighboring tissues can occur, which can lead to functional disorders. For example, a Tumor near a joint can impair mobility or cause Lameness.

Other general symptoms that may be observed in affected cats include Weight loss, loss of appetite, lethargy, and in some cases Fever. In advanced disease, symptoms may also occur that indicate metastasis of the Tumor to other parts of the body, such as the lungs or liver.

Diagnose

The diagnosis of Malignant Fibrous Histiocytoma usually begins with a thorough clinical examination by a veterinarian. A palpable mass can be detected by palpation, and the veterinarian may recommend additional diagnostic tests to determine the type of Tumor.

Imaging procedures such as X-rays, ultrasound, or MRI can be used to assess the size, location, and extent of Tumor spread. These procedures are important to determine whether the Tumor can be surgically removed and whether metastases are present.

A definitive diagnosis usually requires a biopsy, in which a tissue sample of the Tumor is taken and examined under a microscope. The histological examination of the biopsy can show the characteristic features of MFH, including the presence of spindle cells and giant multinucleated cells.

Therapie

The treatment of Malignant Fibrous Histiocytoma in cats depends on several factors, including the size and location of the Tumor, as well as the cat’s general health. Surgical removal of the Tumor is the preferred treatment option and offers the best chance of a cure, especially if the Tumor can be completely removed.

In cases where complete surgical removal is not possible, radiation therapy may be considered to destroy remaining Tumor cells and slow Tumor growth. Chemotherapy may also be an option, especially if systemic treatment is needed to combat metastasis.

Follow-up care is an important part of treatment and may include regular check-ups and imaging studies to detect Tumor recurrence early. Support through pain management and nutritional counseling can also be part of the treatment plan to improve the quality of life of the affected cat.

Prognose und Nachsorge

The prognosis for cats with Malignant Fibrous Histiocytoma can vary and depends largely on the possibility of complete surgical removal of the Tumor. If the Tumor can be completely removed, the prognosis is generally better, and the cat may have an extended survival time.

In cases where the Tumor cannot be completely removed or metastases are present, the prognosis is less favorable. The risk of recurrence is high, and survival time may be significantly shortened.

However, early diagnosis and aggressive treatment can help extend survival time and improve the quality of life of the affected cat. Regular follow-up examinations are crucial to monitor the course of the disease.

Prävention

To minimize the risk of Malignant Fibrous Histiocytoma in cats, it is important to pay attention to a healthy lifestyle and environment. A balanced diet rich in nutrients can strengthen the cat’s immune system and thus reduce the risk of Tumor formation. In addition, care should be taken to ensure that the cat lives in a stress-free environment, as stress could weaken the immune system.

Regular veterinary visits are crucial to perform general health checks and detect possible signs of health problems early. This allows for early intervention and can prevent or slow the progression of diseases. It is also advisable to keep cats away from potential carcinogens that may be present in some household products or in the environment.

Genetic factors also play a role, so it is important to inquire about the medical history of the parents when acquiring a cat from a breeder. Careful selection can help reduce the risk of genetically determined diseases. Finally, cat owners should pay attention to unusual changes in their cat’s behavior or physical condition and seek veterinary advice immediately if they suspect anything.

Ausblick auf aktuelle Forschung

Research on Malignant Fibrous Histiocytoma (MFH) in cats is a dynamic and expanding field in veterinary medicine. While MFH is a rare disease in cats, there are new approaches to diagnosis and treatment that are promising. Researchers are working to better understand how these Tumors develop and what genetic and molecular factors play a role. The discovery of specific biomarkers for MFH could simplify diagnosis in the future and enable earlier detection.

Another focus of research is on treatment options. Surgical removal remains the primary treatment method, but new techniques and drugs are being explored to improve the prognosis. This includes the study of chemotherapy protocols specifically tailored to MFH that may reduce the recurrence rate. In addition, the role of radiation therapy in the treatment of MFH is being investigated, especially for Tumors that are difficult to access.

Immunological research is investigating how the cat’s immune system can be influenced to fight the Tumor cells more effectively. Researchers are testing experimental vaccines and immunotherapies that aim to strengthen the cat’s own defenses. Such approaches could represent a less invasive alternative to current treatment options in the future.

International collaboration is another important aspect of research. By exchanging data and results between different research institutions worldwide, it is possible to make faster progress. Large databases and biobanked samples from affected animals help to better understand the genetic basis and pathophysiology of MFH.

In summary, research on MFH in cats aims to improve diagnosis and treatment and ultimately increase the survival rate and quality of life of affected animals. Although much work remains to be done, there are many promising approaches that could lead to significant advances in the near future.

Häufig gestellte Fragen (FAQs)

  1. What is a Malignant Fibrous Histiocytoma? A Malignant Fibrous Histiocytoma is a rare, aggressive Tumor that occurs in cats and arises from connective tissue cells. It can occur in various parts of the body, most commonly in the skin or soft tissue.

  2. What symptoms does a cat with MFH show? Symptoms may include Swelling or nodules under the skin, loss of appetite, Weight loss, lethargy, and sometimes Lameness. The symptoms vary depending on the location and size of the Tumor.

  3. How is a Malignant Fibrous Histiocytoma diagnosed? The diagnosis is usually made through a combination of clinical examination, imaging procedures such as X-rays or ultrasound, and a biopsy of the affected tissue for histopathological examination.

  4. What treatment options are available for MFH in cats? The most common treatment is surgical removal of the Tumor. In some cases, additional treatment such as chemotherapy or radiation therapy may be considered to reduce the risk of recurrence.

  5. What is the prognosis for cats with MFH? The prognosis depends on the size and location of the Tumor and whether the Tumor could be completely removed. With complete removal, the prognosis can be favorable, but there is a high risk of recurrence.

  6. Is MFH heritable in cats? Currently, there is no evidence that MFH is heritable in cats. The exact cause of the disease is not yet fully understood.

  7. Can other animals or humans be infected by a cat with MFH? No, MFH is not contagious. It cannot be transmitted to humans or other animals.

  8. Are there risk factors that increase the likelihood of MFH? The exact risk factors are not known. However, some studies suggest that older cats may be at higher risk of developing this type of Tumor.

  9. How can I protect my cat from MFH? Since the exact cause of MFH is unknown, there are no specific prevention measures. However, a healthy lifestyle, including a balanced diet and regular veterinary check-ups, can contribute to overall health.

  10. What should I do if I notice a lump on my cat? If you notice a lump or Swelling on your cat, you should see a veterinarian as soon as possible. Early examination and diagnosis can be crucial for the successful treatment of Tumors.

Literatur

Meuten, Donald J. Tumors in Domestic Animals. 5th Edition, Wiley Blackwell, 2016.
Withrow, Stephen J.; Vail, David M. Withrow and MacEwen’s Small Animal Clinical Oncology. 5th Edition, Saunders, 2013.
Dobson, Jane M.; Lascelles, B. Duncan X. BSAVA Manual of Canine and Feline Oncology. 3rd Edition, British Small Animal Veterinary Association, 2011.

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