Bone Marrow Cancer (Myeloma) in Cats

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Multiple Myeloma in Cats

Multiple myeloma is an uncommon cancer that is derived from a clonal population of cancerous (malignant) plasma cells in the bone marrow. A “clonal population of cells” is a group of cells that have descended from a single cell; all of them have the same genetic make-up. Plasma cells are specialized white-blood cells, lymphocytes that have been altered to produce immunoglobulin, an immune protein or antibody necessary for fighting disease.

Three of four defining features must be present for a diagnosis of multiple myeloma: immune protein from a single clone of cells (known as a monoclonal gammopathy), seen as a spike in the gamma region of a protein analysis of the blood (known as a protein electrophoresis); cancerous plasma cells or a high number of plasma cells in the bone marrow (known as plasmacytosis); destruction of areas of bone (known as lytic bone lesions); and a particular type of protein found in the urine (known as Bence Jones [light-chain] proteinuria).

Multiple myeloma occurs primarily in middle-aged or older cats (6-13 years).

Symptoms and Types

Attributed to bone infiltration and destruction of bone, effects of proteins produced by the tumor (such as increased protein in the blood leading to sludging of the blood and kidney damage), and infiltration of organ(s) by cancerous cells. Symptoms depend on location and extent of disease.

  • Weakness
  • Lameness
  • Generalized discomfort or uneasiness
  • Pain
  • Fever
  • Partial paralysis
  • Increased thirst
  • Increased urination
  • Urinary incontinence
  • Dementia
  • Labored breathing
  • Lack of appetite
  • Weight loss
  • Bleeding from the nose that may involve one or both nostrils
  • Bleeding in the back part of the eye and blindness
  • Excessive bleeding from needle punctures to collect blood or to administer intravenous medications and/or fluids
  • Bleeding involving the gastrointestinal tract




You will need to give a thorough history of your cat’s health and onset of symptoms. The history you provide may give your veterinarian clues as to which organs are causing secondary symptoms. Along with a thorough physical examination, your veterinarian will also conduct a thorough ophthalmological examination on your cat, if the eyes are showing symptoms of a diseased state.

Symptoms for multiple myeloma resemble those of several other diseases. Your veterinarian will need to rule out a number of other possibilities for the symptoms, such as infections, other types of tumors, and immune-mediated illnesses. To do that, your doctor will conduct a complete blood profile, including a chemical blood profile, a complete blood count, and a urinalysis. Diagnostic imaging will include X-rays of the vertebra and limbs to look for bone lesions, and ultrasound to examine the internal organs.

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radiation therapy

A treatment of certain neoplasms that is administered using an x ray


Protein found in the urine


The product of protein being metabolized; can be found in blood or urine.


An in-depth examination of the properties of urine; used to determine the presence or absence of illness


A bone in the spinal column


A cell that aids in clotting


A type of tumor made up of certain cells in the bone marrow


A type of antibody in the plasma; there are five of them


The digestive tract containing the stomach and intestine


A decrease in the number of white blood cells (abnormal)


Something that becomes worse or life threatening as it spreads


A protein in the body that is designed to fight disease; antibodies are brought on by the presence of certain antigens in the system.


The ability to create a disease where a disease might not normally be found, usually due to an ill timed or unlikely weakness

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