Home » Diseases » In cats » Mucocutaneous Plasmacytoma (skin cancer originating from plasma cells, a type of white blood cells)

Mucocutaneous Plasmacytoma (skin cancer originating from plasma cells, a type of white blood cells) in cats

Occurrence: very rare
Location of illness: Skin/Fur

Author: Dr. med. vet. Gisa Löwe | Last modified: 17.02.2026

When to visit the vet?

Non-urgent see a veterinarian within 2–3 days

If the condition worsens / symptoms persist, consult a veterinarian.

Definition

Mucocutaneous plasmacytoma is a form of skin cancerCancer refers to the uncontrolled proliferation of cells that can lead to tumors or spread throughout the body. Various types of cancer occur in dogs and cats, ranging from skin cancer to lymphomas. in cats that originates from plasmaPlasma is the liquid part of blood in which blood cells are suspended. It contains water, salts, proteins, and other substances and serves as a transport medium for nutrients, hormones, and waste products. cells, a type of white blood cells, and primarily affects the skin and mucous membranes.

The most important facts at a glance

Mucocutaneous plasmacytoma in cats is a rare tumor disease originating from plasmaPlasma is the liquid part of blood in which blood cells are suspended. It contains water, salts, proteins, and other substances and serves as a transport medium for nutrients, hormones, and waste products. cells, a type of white blood cell that produces antibodyAn antibody is a protein produced by the immune system to recognize and bind specific antigens. By binding to the antigen, antibodies can help destroy or neutralize it.. The exact causes are unclear, but genetic factors, environmental factors, and chronicChronic refers to a condition or disease that is long-lasting or permanent. Chronic diseases often develop slowly and can lead to persistent or recurring health problems over time. Inflammatory conditions could play a role. Symptoms include small, hard nodules on the skin that can become ulcerated, as well as systemic signs such as loss of appetite, Weight loss, increased thirst, and urination. diagnosisA diagnosis is the identification of a disease or condition by its symptoms and/or results from diagnostic tests. It is the first step in the management and treatment of patients. is made through a clinical examination and a biopsyA biopsy is a medical procedure in which a small amount of tissue is removed from the body to be examined under a microscope for signs of disease. Biopsies can help diagnose cancer and other conditions. to identify abnormal plasmaPlasma is the liquid part of blood in which blood cells are suspended. It contains water, salts, proteins, and other substances and serves as a transport medium for nutrients, hormones, and waste products. cells. Blood tests and imaging procedures can assess the extent of the disease. Treatment depends on the tumorA tumor is an abnormal growth of tissue that can be benign or malignant. Tumors can develop in any part of the body and affect various functions. size, location, and the cat’s health status. The tumorA tumor is an abnormal growth of tissue that can be benign or malignant. Tumors can develop in any part of the body and affect various functions. is often surgically removed. radiation therapyRadiation therapy is the use of radiation, most often to treat cancer. It can be used to kill cancer cells or slow their growth without significantly damaging surrounding healthy tissue. or chemotherapyChemotherapy refers to the treatment of diseases, especially cancer, with chemical substances or drugs. It aims to kill cancer cells or prevent their growth, but can also affect healthy cells. may also be used to destroy remaining tumorA tumor is an abnormal growth of tissue that can be benign or malignant. Tumors can develop in any part of the body and affect various functions. cells. In cases where the tumorA tumor is an abnormal growth of tissue that can be benign or malignant. Tumors can develop in any part of the body and affect various functions. is inoperable or metastasesA metastasis is a secondary tumor that originates from a primary, malignant tumor in another part of the body. Metastases indicate that cancer has spread in the body. are present, palliativePalliative refers to treatments that aim to alleviate the symptoms of a disease without curing the disease itself. Palliative care focuses on improving the quality of life of patients with incurable diseases. treatment may be necessary. The prognosisThe prognosis is the prediction of the likely course and outcome of a disease based on the general state of health, the nature of the disease, and the response to treatment. It can provide information on how a disease is expected to develop. depends on early diagnosisA diagnosis is the identification of a disease or condition by its symptoms and/or results from diagnostic tests. It is the first step in the management and treatment of patients. and complete removal of the tumorA tumor is an abnormal growth of tissue that can be benign or malignant. Tumors can develop in any part of the body and affect various functions.. Regular veterinary check-ups, a balanced diet, and protectionProtection refers to safeguarding against diseases or harm. In veterinary medicine, this can include protecting animals through vaccinations, the use of parasite control products, or providing a safe environment. from UV radiation can reduce the risk of developing mucocutaneous plasmacytoma. Research focuses on genetic and molecular bases to develop new diagnosisA diagnosis is the identification of a disease or condition by its symptoms and/or results from diagnostic tests. It is the first step in the management and treatment of patients. and treatment options, including immunotherapies and non-invasive diagnosisA diagnosis is the identification of a disease or condition by its symptoms and/or results from diagnostic tests. It is the first step in the management and treatment of patients. methods.

Causes

PlasmaPlasma is the liquid part of blood in which blood cells are suspended. It contains water, salts, proteins, and other substances and serves as a transport medium for nutrients, hormones, and waste products. cells are specialized white blood cells that originate from B-lymphocytes and play an important role in the immune systemThe immune system is the body's defense system against infectious agents such as bacteria, viruses, fungi, and parasites. It comprises a complex network of organs, cells, and molecules that work together to protect the body. by producing antibodies. If these cells multiply uncontrollably, it can lead to the formation of tumors, which are called plasmacytomas.

The exact causes for the development of mucocutaneous plasmacytomas in cats are not yet fully understood. However, it is suspected that genetic factors may play a role, as certain breeds may be more susceptible to this type of tumors. Furthermore, environmental factors or previous infections could increase the risk.

It is also believed that chronicChronic refers to a condition or disease that is long-lasting or permanent. Chronic diseases often develop slowly and can lead to persistent or recurring health problems over time. inflammatory conditions or immune systemThe immune system is the body's defense system against infectious agents such as bacteria, viruses, fungi, and parasites. It comprises a complex network of organs, cells, and molecules that work together to protect the body. disorders could play a role in the development of these tumors. Chronic stimulation of the immune systemThe immune system is the body's defense system against infectious agents such as bacteria, viruses, fungi, and parasites. It comprises a complex network of organs, cells, and molecules that work together to protect the body. could lead to an abnormal proliferation of plasmaPlasma is the liquid part of blood in which blood cells are suspended. It contains water, salts, proteins, and other substances and serves as a transport medium for nutrients, hormones, and waste products. cells, which eventually transition into a malignantMalignant means "cancerous" and is used to describe tumors or neoplasms that grow invasively and have the ability to metastasize. Malignant tumors can cause serious health problems in dogs and cats. state.

Symptoms

Very common symptoms:

Common symptoms:

Rare symptoms:

The symptoms of mucocutaneous plasmacytoma in cats can vary depending on the location and size of the tumorA tumor is an abnormal growth of tissue that can be benign or malignant. Tumors can develop in any part of the body and affect various functions.. Nodular or ulcerativeUlcerative refers to the condition or process that leads to the formation of ulcers. Ulcers are open Wounds or Lesions that can form on the skin or mucous membranes, are painful, and often heal slowly. skin changes often occur, which are frequently found on mucous membranes or at transitions between skin and mucous membrane, such as the lips.

Affected cats may show itching or pain at the affected site. In some cases, bleeding or an infectionAn infection is the colonization and multiplication of pathogens such as bacteria, viruses, fungi, or parasites in an organism, which often, but not always, leads to a disease. of the tumorA tumor is an abnormal growth of tissue that can be benign or malignant. Tumors can develop in any part of the body and affect various functions. may occur, especially if the skin surface is injured.

In advanced cases or if metastasesA metastasis is a secondary tumor that originates from a primary, malignant tumor in another part of the body. Metastases indicate that cancer has spread in the body. are present, systemic symptoms such as weight loss, loss of appetite, or general weakness may occur.

Diagnosis

The diagnosisA diagnosis is the identification of a disease or condition by its symptoms and/or results from diagnostic tests. It is the first step in the management and treatment of patients. of mucocutaneous plasmacytoma usually begins with a thorough clinical examination of the cat, during which the veterinarian assesses the skin changes and looks for other symptoms.

A biopsyA biopsy is a medical procedure in which a small amount of tissue is removed from the body to be examined under a microscope for signs of disease. Biopsies can help diagnose cancer and other conditions. of the suspicious skin change is often required to make a definitive diagnosisA diagnosis is the identification of a disease or condition by its symptoms and/or results from diagnostic tests. It is the first step in the management and treatment of patients.. A tissue sample is taken and examined microscopically to confirm the presence of abnormal plasmaPlasma is the liquid part of blood in which blood cells are suspended. It contains water, salts, proteins, and other substances and serves as a transport medium for nutrients, hormones, and waste products. cells. Additionally, immunohistochemistryImmunohistochemistry is a laboratory technique that uses antibodies to identify and localize specific antigens in tissue sections. This method is used in veterinary diagnostics to detect and characterize diseases at the cellular level in dogs and cats. can be used to identify specific surface markers of the plasma cells.

Further diagnostic tests, such as blood tests or imaging procedures like X-rayX-ray is an imaging technique that uses X-rays to create images of the inside of the body. It is often used to diagnose bone fractures, lung diseases, and other conditions. or ultrasoundUltrasound refers to sound waves that are above the hearing threshold of the human ear. In medicine, ultrasound is used for diagnostic imaging procedures to visualize internal organs, tissues, and blood flow., may be necessary to assess the extent of the disease and look for possible metastasesA metastasis is a secondary tumor that originates from a primary, malignant tumor in another part of the body. Metastases indicate that cancer has spread in the body..

Therapy

The treatment of mucocutaneous plasmacytoma in cats depends on several factors, including the size and location of the tumor, the presence of metastasesA metastasis is a secondary tumor that originates from a primary, malignant tumor in another part of the body. Metastases indicate that cancer has spread in the body., and the cat’s general health condition.

In many cases, surgical removal of the tumorA tumor is an abnormal growth of tissue that can be benign or malignant. Tumors can develop in any part of the body and affect various functions. is the preferred treatment option. The success of the surgery depends on the complete removal of the tumorA tumor is an abnormal growth of tissue that can be benign or malignant. Tumors can develop in any part of the body and affect various functions. with sufficient safety margins to prevent recurrence.

In cases of incomplete removal or if the tumorA tumor is an abnormal growth of tissue that can be benign or malignant. Tumors can develop in any part of the body and affect various functions. is located in a hard-to-reach area, additional treatment measures such as radiation therapyRadiation therapy is the use of radiation, most often to treat cancer. It can be used to kill cancer cells or slow their growth without significantly damaging surrounding healthy tissue. or chemotherapyChemotherapy refers to the treatment of diseases, especially cancer, with chemical substances or drugs. It aims to kill cancer cells or prevent their growth, but can also affect healthy cells. may be considered. These treatments can help destroy remaining tumor cells and reduce the risk of recurrence.

In some cases, especially if the tumorA tumor is an abnormal growth of tissue that can be benign or malignant. Tumors can develop in any part of the body and affect various functions. is inoperable or metastasesA metastasis is a secondary tumor that originates from a primary, malignant tumor in another part of the body. Metastases indicate that cancer has spread in the body. are present, palliativePalliative refers to treatments that aim to alleviate the symptoms of a disease without curing the disease itself. Palliative care focuses on improving the quality of life of patients with incurable diseases. treatment may be necessary to maintain the cat’s quality of life and alleviate symptoms.

Prognosis and follow-up care

The prognosis for cats with mucocutaneous plasmacytoma varies greatly and depends on several factors, including the size and location of the tumorA tumor is an abnormal growth of tissue that can be benign or malignant. Tumors can develop in any part of the body and affect various functions., the presence of metastasesA metastasis is a secondary tumor that originates from a primary, malignant tumor in another part of the body. Metastases indicate that cancer has spread in the body., and the response to treatment.

Generally, the prognosisThe prognosis is the prediction of the likely course and outcome of a disease based on the general state of health, the nature of the disease, and the response to treatment. It can provide information on how a disease is expected to develop. is good with early diagnosisA diagnosis is the identification of a disease or condition by its symptoms and/or results from diagnostic tests. It is the first step in the management and treatment of patients. and complete surgical removal of the tumorA tumor is an abnormal growth of tissue that can be benign or malignant. Tumors can develop in any part of the body and affect various functions., and many cats can lead a normal life after treatment. However, if the tumorA tumor is an abnormal growth of tissue that can be benign or malignant. Tumors can develop in any part of the body and affect various functions. cannot be completely removed or if metastasesA metastasis is a secondary tumor that originates from a primary, malignant tumor in another part of the body. Metastases indicate that cancer has spread in the body. are present, the prognosisThe prognosis is the prediction of the likely course and outcome of a disease based on the general state of health, the nature of the disease, and the response to treatment. It can provide information on how a disease is expected to develop. is more guarded.

Regular follow-up examinations are important to detect a recurrence of the tumorA tumor is an abnormal growth of tissue that can be benign or malignant. Tumors can develop in any part of the body and affect various functions. early and to treat it promptly if necessary.

Prevention

To minimize the risk of a cat developing mucocutaneous plasmacytoma, regular veterinary check-ups are important. Early detection of changes or abnormalities in the skin can be crucial for timely intervention. Cat owners should regularly examine their pets for unusual Skin lesions or growths and consult a vet promptly if anything unusual is noticed.

A balanced diet and good care also contribute to the cat’s overall health and strengthen its immune systemThe immune system is the body's defense system against infectious agents such as bacteria, viruses, fungi, and parasites. It comprises a complex network of organs, cells, and molecules that work together to protect the body., which can potentially lower the risk of tumorA tumor is an abnormal growth of tissue that can be benign or malignant. Tumors can develop in any part of the body and affect various functions. diseases. Additionally, cat owners should ensure their pets are protected from excessive sun exposureExposure refers to the Contact with or subjection to certain substances, environmental factors, or pathogens. In veterinary medicine, this can include Contact with toxins, allergens, or infectious agents that can cause health problems in dogs and cats., as UV radiation is considered a factor in the development of skin cancerCancer refers to the uncontrolled proliferation of cells that can lead to tumors or spread throughout the body. Various types of cancer occur in dogs and cats, ranging from skin cancer to lymphomas..

Minimizing stressStress refers to the state of an organism reacting to external stimuli or demands. In veterinary medicine, stress can have physical or psychological effects on animals, impacting their health and well-being. and ensuring a safe, clean living environment are additional factors that can contribute to disease preventionPrevention includes measures taken to prevent diseases or injuries. In veterinary medicine, this includes vaccinations, parasite control, and health monitoring.. It is also advisable to keep cats away from potentially carcinogenic chemicals or substances that may be found in household cleaners or pesticidesPesticides are chemical or biological substances used to control pests, including insects, weeds, and fungi. In dogs and cats, exposure to certain pesticides can be harmful to health and lead to signs of poisoning., to reduce the risk of developing skin cancerCancer refers to the uncontrolled proliferation of cells that can lead to tumors or spread throughout the body. Various types of cancer occur in dogs and cats, ranging from skin cancer to lymphomas..

Outlook on current research

Research on mucocutaneous plasmacytomas in cats is a developing field that is gaining increasing importance. Plasmacytomas are tumors that originate from plasmaPlasma is the liquid part of blood in which blood cells are suspended. It contains water, salts, proteins, and other substances and serves as a transport medium for nutrients, hormones, and waste products. cells, a type of white blood cells that play an important role in the immune systemThe immune system is the body's defense system against infectious agents such as bacteria, viruses, fungi, and parasites. It comprises a complex network of organs, cells, and molecules that work together to protect the body.. In cats, mucocutaneous plasmacytomas are relatively rare, which complicates research due to the lack of large case numbers for meaningful studies.

Current studies focus on better understanding the genetic and molecular basis of these tumors to develop new diagnostic and treatment options. Researchers use advanced techniques such as genome sequencing to identify the genetic changes that contribute to the development of these tumors. By understanding the genetic landscape of these tumors, scientists hope to develop targeted therapies that specifically target the molecular vulnerabilities of the tumorA tumor is an abnormal growth of tissue that can be benign or malignant. Tumors can develop in any part of the body and affect various functions. cells.

Another important area of research is the investigation of the immune responseAn immune response is the immune system's reaction to foreign substances (antigens), such as microorganisms or proteins. It involves a series of processes aimed at recognizing, fighting, and eliminating these antigens. in cats with mucocutaneous plasmacytomas. Since plasmaPlasma is the liquid part of blood in which blood cells are suspended. It contains water, salts, proteins, and other substances and serves as a transport medium for nutrients, hormones, and waste products. cells are part of the immune systemThe immune system is the body's defense system against infectious agents such as bacteria, viruses, fungi, and parasites. It comprises a complex network of organs, cells, and molecules that work together to protect the body., the way the immune systemThe immune system is the body's defense system against infectious agents such as bacteria, viruses, fungi, and parasites. It comprises a complex network of organs, cells, and molecules that work together to protect the body. reacts to these tumors could provide important clues for new treatment approaches. Immunotherapies that stimulate the immune systemThe immune system is the body's defense system against infectious agents such as bacteria, viruses, fungi, and parasites. It comprises a complex network of organs, cells, and molecules that work together to protect the body. to effectively fight tumorA tumor is an abnormal growth of tissue that can be benign or malignant. Tumors can develop in any part of the body and affect various functions. cells are a promising approach that is already successfully used in human medicine and is now also being researched in animals.

Additionally, researchers are investigating the role of environmental factors and pre-existing conditions in the development of mucocutaneous plasmacytomas. Factors such as nutrition, viruses, chronicChronic refers to a condition or disease that is long-lasting or permanent. Chronic diseases often develop slowly and can lead to persistent or recurring health problems over time. inflammatory conditions, and genetic predispositions could influence the risk for the development of these tumors. By identifying risk factors, scientists hope to develop strategies for the preventionPrevention includes measures taken to prevent diseases or injuries. In veterinary medicine, this includes vaccinations, parasite control, and health monitoring. of this disease.

The development of new diagnostic tools is another important goal of research. Currently, diagnosisA diagnosis is the identification of a disease or condition by its symptoms and/or results from diagnostic tests. It is the first step in the management and treatment of patients. is often based on histopathologicalHistopathological refers to the microscopic examination of tissue samples for the diagnosis of diseases. This technique is used to identify the specific characteristics of diseases at the cellular level in dogs and cats. examinations that require a biopsyA biopsy is a medical procedure in which a small amount of tissue is removed from the body to be examined under a microscope for signs of disease. Biopsies can help diagnose cancer and other conditions. of the tumorA tumor is an abnormal growth of tissue that can be benign or malignant. Tumors can develop in any part of the body and affect various functions.. Researchers are working on the development of non-invasive diagnostic methods, such as the identification of biomarkers in the blood, which could enable an earlier and less burdensome diagnosisA diagnosis is the identification of a disease or condition by its symptoms and/or results from diagnostic tests. It is the first step in the management and treatment of patients..

Although there are still many challenges to overcome, the progress in research is promising. The increasing attention given to mucocutaneous plasmacytomas in cats is expected to lead to better diagnostic and treatment options and ultimately improve the quality of life and survival of affected cats.

Frequently asked questions (FAQs)

What is mucocutaneous plasmacytoma in cats? A mucocutaneous plasmacytoma is a rare tumorA tumor is an abnormal growth of tissue that can be benign or malignant. Tumors can develop in any part of the body and affect various functions. in cats that originates from plasmaPlasma is the liquid part of blood in which blood cells are suspended. It contains water, salts, proteins, and other substances and serves as a transport medium for nutrients, hormones, and waste products. cells, a type of white blood cells. These tumors often occur on the skin or mucous membranes.
How is mucocutaneous plasmacytoma diagnosed? DiagnosisA diagnosis is the identification of a disease or condition by its symptoms and/or results from diagnostic tests. It is the first step in the management and treatment of patients. is usually made by a biopsyA biopsy is a medical procedure in which a small amount of tissue is removed from the body to be examined under a microscope for signs of disease. Biopsies can help diagnose cancer and other conditions. of the affected tissue, followed by a histopathologicalHistopathological refers to the microscopic examination of tissue samples for the diagnosis of diseases. This technique is used to identify the specific characteristics of diseases at the cellular level in dogs and cats. examination under the microscope. In some cases, additional tests such as blood tests or imaging procedures may be necessary.
Are mucocutaneous plasmacytomas in cats malignantMalignant means "cancerous" and is used to describe tumors or neoplasms that grow invasively and have the ability to metastasize. Malignant tumors can cause serious health problems in dogs and cats.? Mucocutaneous plasmacytomas in cats are usually benignBenign refers to a non-invasive, non-serious condition that is not life-threatening. In medicine, the term is often used to describe benign tumors that do not metastasize, meaning they do not form secondary tumors., but in rare cases, they can be malignantMalignant means "cancerous" and is used to describe tumors or neoplasms that grow invasively and have the ability to metastasize. Malignant tumors can cause serious health problems in dogs and cats. and spread to other parts of the body. An accurate diagnosisA diagnosis is the identification of a disease or condition by its symptoms and/or results from diagnostic tests. It is the first step in the management and treatment of patients. by a veterinarian is important to determine the best treatment plan.
What are the treatment options for mucocutaneous plasmacytomas? The most common treatment is surgical removal of the tumor. In some cases, additional treatments such as radiation therapyRadiation therapy is the use of radiation, most often to treat cancer. It can be used to kill cancer cells or slow their growth without significantly damaging surrounding healthy tissue. or chemotherapyChemotherapy refers to the treatment of diseases, especially cancer, with chemical substances or drugs. It aims to kill cancer cells or prevent their growth, but can also affect healthy cells. may be necessary, especially if the tumorA tumor is an abnormal growth of tissue that can be benign or malignant. Tumors can develop in any part of the body and affect various functions. is malignantMalignant means "cancerous" and is used to describe tumors or neoplasms that grow invasively and have the ability to metastasize. Malignant tumors can cause serious health problems in dogs and cats. or cannot be completely removed.
What are the symptoms of mucocutaneous plasmacytoma? Symptoms may include swelling or nodules on the skin or mucous membranes, changes in skin color or texture, itching or pain. If a tumorA tumor is an abnormal growth of tissue that can be benign or malignant. Tumors can develop in any part of the body and affect various functions. is suspected, a veterinarian should be consulted.
Can mucocutaneous plasmacytomas be prevented in cats? Since the exact causes of these Tumors are not yet fully understood, there are no specific preventive measures. However, a healthy lifestyle, regular veterinary check-ups, and avoiding known risk factors can be helpful.
Are certain cat breeds more susceptible to mucocutaneous plasmacytomas? There is currently no evidence that certain cat breeds have a higher risk for these Tumors. However, research into genetic predispositions is not yet complete.
What is the survival rate for cats with mucocutaneous plasmacytomas? The survival rate depends on various factors, including the malignancyMalignancy refers to the aggressiveness of a tumor, that is, its ability to grow invasively and metastasize. Malignant tumors can be life-threatening in dogs and cats and require specific treatment. of the tumorA tumor is an abnormal growth of tissue that can be benign or malignant. Tumors can develop in any part of the body and affect various functions., its location, and early detection. BenignBenign refers to a non-invasive, non-serious condition that is not life-threatening. In medicine, the term is often used to describe benign tumors that do not metastasize, meaning they do not form secondary tumors. Tumors that are completely removed generally have a good prognosisThe prognosis is the prediction of the likely course and outcome of a disease based on the general state of health, the nature of the disease, and the response to treatment. It can provide information on how a disease is expected to develop..
Can mucocutaneous plasmacytomas recur in cats? Yes, as with many tumorA tumor is an abnormal growth of tissue that can be benign or malignant. Tumors can develop in any part of the body and affect various functions. diseases, there is a possibility of recurrence. Regular follow-up examinations with the vet are important to detect and treat a recurrence early.
What research is currently being conducted on mucocutaneous plasmacytomas? Current research focuses on genetic analyses, immune responseAn immune response is the immune system's reaction to foreign substances (antigens), such as microorganisms or proteins. It involves a series of processes aimed at recognizing, fighting, and eliminating these antigens., environmental factors, and the development of new diagnosisA diagnosis is the identification of a disease or condition by its symptoms and/or results from diagnostic tests. It is the first step in the management and treatment of patients. and treatment methods. The goal is to improve understanding of the disease and develop more effective therapies.