Introduction
Multiple Myeloma is a type of blood cancer that develops from abnormal plasma cells, a type of white blood cell normally found in the bone marrow. Abnormal plasma cells can multiply excessively and produce an abnormal protein called monoclonal protein (M protein). The disease can affect the bones, kidneys, blood counts and immune system.
Overview
Multiple Myeloma is a type of blood cancer that develops from abnormal plasma cells, a type of white blood cell normally found in the bone marrow. Abnormal plasma cells can multiply excessively and produce an abnormal protein called monoclonal protein (M protein). The disease can affect the bones, kidneys, blood counts and immune system
Multiple Myeloma Develop
he exact cause of multiple myeloma is not completely understood.
Normally, plasma cells produce antibodies in response to infections and other immune signals. In multiple myeloma, one abnormal plasma-cell population begins multiplying uncontrollably.
These abnormal cells can accumulate inside the bone marrow and produce a large amount of one type of abnormal protein.
Over time, the growing population of myeloma cells can:
- Reduce normal blood-cell production.
- Damage bone tissue.
- Increase calcium levels in the blood.
- Produce proteins that may affect kidney function.
- Reduce normal immune-system function.
Causes
The exact cause of multiple myeloma is usually unknown.Researchers believe that multiple genetic and environmental factors may contribute to abnormal plasma-cell development.Multiple myeloma generally develops because of acquired changes in plasma cells rather than because a person inherits a single specific gene that directly causes the disease.Importantly, having a risk factor does not mean that a person will definitely develop multiple myeloma.
Risk Factors for Multiple Myeloma
Some factors are associated with an increased risk.
Age
Multiple myeloma is more common in middle-aged and older adults.
Sex
It is somewhat more common in men.
Previous Plasma-Cell Disorders
A previous diagnosis of MGUS (monoclonal gammopathy of undetermined significance) or certain other plasma-cell disorders can increase the risk of developing multiple myeloma.
Radiation or Certain Chemical Exposures
Some environmental exposures have been associated with increased risk, although these do not explain most cases.
Symptoms
Multiple myeloma can develop gradually, and some people may initially have no obvious symptoms. When symptoms occur, they can vary considerably.
Common symptoms include:
1. Bone Pain
Bone pain is one of the important symptoms of multiple myeloma.
Pain may occur particularly in:
- Back
- Hips
- Ribs
- Skull
- Other bones
Myeloma can weaken bones and increase the risk of fractures.
2. Fatigue and Weakness
Abnormal plasma cells can crowd the bone marrow and reduce production of red blood cells.
This may cause anemia, resulting in:
- Fatigue
- Weakness
- Dizziness
- Shortness of breath
- Reduced physical activity tolerance
3. Frequent Infections
Multiple myeloma can interfere with normal antibody production and immune function.
As a result, some patients may develop infections more frequently or may take longer to recover from infections.
4. Kidney Problems
Myeloma-related proteins can damage the kidneys.
Kidney problems may initially be detected through blood or urine tests rather than symptoms. More advanced kidney dysfunction can cause:
- Weakness
- Swelling of the legs
- Shortness of breath
- Changes related to fluid retention
5. High Calcium Level
Bone damage can release calcium into the bloodstream, causing hypercalcemia.
Symptoms can include:
- Excessive thirst
- Frequent urination
- Constipation
- Abdominal discomfort
- Weakness
- Loss of appetite
- Drowsiness
- Confusion
Severe hypercalcemia can become a medical emergency
Stages of Multiple Myeloma
Unlike leukemia, which is often described by phases, multiple myeloma is commonly staged.
One commonly used system is the Revised International Staging System (R-ISS).
It considers factors including:
- Beta-2 microglobulin
- Albumin
- LDH
- Specific cytogenetic abnormalities
These factors help doctors assess disease severity and prognosis.
The stage should not be interpreted alone. Genetic characteristics, response to treatment, overall health and other clinical factors can also influence prognosis.
Diagnosis
There is no single test that can diagnose every case of multiple myeloma. Doctors usually combine blood tests, urine tests, bone marrow examination and imaging studies.
1. Complete Blood Count (CBC)
A CBC measures:
- Hemoglobin
- Red blood cells
- White blood cells
- Platelets
Multiple myeloma may cause reduced blood-cell counts, particularly anemia, because abnormal plasma cells can occupy space within the bone marrow.
2. Serum Protein Electrophoresis
Serum protein electrophoresis (SPEP) can help detect abnormal proteins in the blood.
Doctors may also use immunofixation electrophoresis to identify the type of abnormal immunoglobulin.
3. Serum Free Light Chain Test
The serum free light chain test measures free kappa and lambda light chains.
An abnormal ratio may provide important information when evaluating a plasma-cell disorder.
4. Calcium and Kidney Function Tests
Blood tests may include:
- Serum calcium
- Creatinine
- Urea
- Albumin
- Total protein
- Other kidney and metabolic tests
These tests help identify organ effects associated with myeloma.
5. Beta-2 Microglobulin
Beta-2 microglobulin (β2M) is an important laboratory marker used in assessing multiple myeloma and contributes to disease staging.
Bone Marrow Examination
A bone marrow aspiration and biopsy is an important investigation when multiple myeloma is suspected.
The sample can help determine:
- Percentage of plasma cells
- Morphology of plasma cells
- Chromosomal abnormalities
- Genetic abnormalities
- Other characteristics of the disease
Bone marrow testing is commonly part of the diagnostic evaluation.
Imaging Tests for Multiple Myeloma
Imaging is important because multiple myeloma can cause bone damage.
Doctors may use:
- X-ray
- Low-dose CT
- MRI
- PET/CT
Imaging can identify bone lesions, fractures or other abnormalities.
Modern evaluation may use CT, MRI or PET-based imaging depending on the clinical situation.
CRAB Features of Multiple Myeloma
A useful way to understand important organ effects of active multiple myeloma is the CRAB concept:
C – Calcium: Increased blood calcium
R – Renal: Kidney impairment
A – Anemia: Reduced red blood cells/hemoglobin
B – Bone: Bone lesions or damage
These findings can indicate that the abnormal plasma-cell disorder is affecting the body.
Modern diagnostic criteria also include specific biomarkers and imaging findings beyond the traditional CRAB features.
Multiple Myeloma Be Prevented
There is currently no proven method to prevent most cases of multiple myeloma, and there is no recommended routine screening test for the general population.
People with certain precursor conditions, such as MGUS, may require medical monitoring according to their individual risk.
Conclusion
Multiple Myeloma is a cancer of abnormal plasma cells that develops mainly in the bone marrow. It can affect the bones, blood, kidneys and immune system.
Important symptoms may include bone pain, fatigue, recurrent infections, anemia, kidney problems and symptoms related to high calcium. However, some people may have no symptoms when the disease is first detected.
Diagnosis usually involves a combination of CBC, blood protein studies, serum free light chains, calcium and kidney-function tests, urine studies, bone marrow examination and imaging.
Treatment has advanced considerably and may include combinations of medicines, stem-cell transplantation, immunotherapy, targeted therapy and, in selected cases, CAR T-cell therapy.
Early medical evaluation, accurate diagnosis and appropriate specialist care are important for managing multiple myeloma and its complications.
Disclaimer
This article is provided for educational and general health-information purposes only. It should not be considered a substitute for professional medical advice, diagnosis or treatment. Laboratory results must be interpreted in the appropriate clinical context. Consult a qualified healthcare professional for individual medical concerns.
Frequently Asked Questions
Is multiple myeloma a blood cancer?
Yes. Multiple myeloma is a blood and bone-marrow cancer that develops from abnormal plasma cells.
What is the most common symptom of multiple myeloma?
Bone pain, particularly in the back, hips or ribs, is an important symptom, although some people have no symptoms at diagnosis.
What blood test can indicate multiple myeloma?
Doctors may use CBC, serum protein electrophoresis, immunofixation, serum free light chains, calcium, creatinine and beta-2 microglobulin, among other tests.
Written by Jambir Sk Certified Medical Laboratory Technologist
Disclaimer: This content is for educational purposes only and should not be consideredas medical advice. Always consult a qualified doctor.We do not provide professional medical advice, diagnosis, or treatment.All health-related content is based on research, knowledge, and general awareness.Always consult a licensed healthcare provider for any medical concerns.HealthSeba.com will not be responsible for any loss, harm, or damage caused by the use of information available on this site.
References & Sources
1. Book Reference
Book:Practical Pathology—P.CHAKRABORTY
Chapter: Chapter 19 – Leukaemia
Page: 127-145
Source: Practical Pathology textbook
2. Medical & Educational Sources
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