The short answer
Plasma cell neoplasms occur when abnormal plasma cells form cancerous tumors in bone or soft tissue. When there is only one tumor, it is called a plasmacytoma. When there are multiple tumors, it is called multiple myeloma.
Plasma cell neoplasms occur when abnormal plasma cells form cancerous tumors.
These tumors can form in bone or soft tissue.
When there is only one tumor, the disease is called a plasmacytoma.
When there are multiple tumors, it is called multiple myeloma.
Subjective: What you might experience
This section describes the symptoms and history a patient might report to their doctor.
Bone pain, often in the back or ribs, and bones that break easily.
Fatigue and weakness from anemia.
Frequent infections.
Excessive thirst, frequent urination, confusion, or constipation (from high calcium).
Foamy urine or kidney problems.
Symptoms are often summarized by the 'CRAB' features
high Calcium, Renal problems, Anemia, Bone lesions.
Objective: Tests and findings
Blood and urine tests for monoclonal (M) protein, including serum protein electrophoresis and free light chains.
Complete blood count, calcium, and kidney function tests.
Bone marrow aspiration and biopsy to measure plasma cells and do genetic testing.
Imaging for bone lesions
low-dose whole-body CT, MRI, or PET.
Beta-2 microglobulin and albumin for staging.
Interactive anatomy guide
Explore where cancers start and how they are found, on an interactive body map.
Open the anatomy guideAssessment: Staging and prognosis
Diagnosis based on marrow plasma cells plus M protein and CRAB/organ-damage criteria.
Distinguished from precursor conditions (MGUS, smoldering myeloma) that may not need treatment.
Staged with the Revised International Staging System using labs and genetics rather than TNM.
Cytogenetic risk features refine prognosis and therapy.
Plan: The treatment approach
Combination drug therapy
proteasome inhibitors, immunomodulators, and monoclonal antibodies, often with steroids.
Autologous stem cell transplant for eligible patients.
Bone-strengthening medication, and treatment of anemia, kidney issues, and high calcium.
Maintenance therapy and CAR T-cell/bispecific therapies or clinical trials for relapse.
Ongoing monitoring of M protein and organ function.
These are simplified, educational SOAP-style summaries showing the kinds of findings clinicians document when evaluating each cancer, based on National Cancer Institute resources. They describe typical diagnostic criteria and workups — not a real patient, and not medical advice. Real clinical notes are individualized. Always rely on your own care team. Based on National Cancer Institute educational content. Educational only — not medical advice.
Words to know
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Common questions
What are plasma cell neoplasms?
Plasma cell neoplasms occur when abnormal plasma cells form cancerous tumors in bone or soft tissue. Multiple myeloma is one type of plasma cell neoplasm.
What is the difference between a plasmacytoma and multiple myeloma?
The difference is the number of tumors. When there is only one tumor, the disease is called a plasmacytoma. When there are multiple tumors, it is called multiple myeloma. Both are types of plasma cell neoplasms.
Where do plasma cell tumors form?
Plasma cell neoplasms form when abnormal plasma cells create cancerous tumors in bone or in soft tissue.
Is multiple myeloma a plasma cell neoplasm?
Yes. Multiple myeloma is a type of plasma cell neoplasm. Plasma cell neoplasms are grouped together because they all involve abnormal plasma cells forming cancerous tumors. Multiple myeloma is the form with multiple tumors.
Is there a standard way to screen for or prevent multiple myeloma?
According to the National Cancer Institute, it does not have evidence-based information about preventing plasma cell neoplasms, including multiple myeloma, and it does not have evidence-based information about screening for them. Your healthcare team is the best source of information for your own situation.
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Sources last checked: 2026-07-21 what this meansLast updated: 2026-08-05Next planned review: 2027-07-21
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How this page was created
Cancer Explained does not originate medical claims. Every page restates guidance already published by the National Cancer Institute, the CDC, the USPSTF and the FDA, in plain language, with the source cited so you can check the original yourself. AI does the translating and organizing; automated checks test claims, citations, clarity and safety before anything publishes. We do not employ clinicians and do not intend to — our work is translation and navigation, not clinical judgment. Nothing here is personal medical advice, and no page can account for your particular situation.
Editorial status: Source checked — This page was written with AI assistance and checked line by line against the sources listed on it. That confirms the sources support what the page says. It is not a medical review, and it does not confirm the page is complete or right for your situation.
Human medical review: not completed. Pages here are not signed off by a clinician before they publish. That is not an oversight we are quietly working around: we restate published guidance and cite it, so the authority belongs to the source rather than to us, and every page names where its claims come from — you can verify us instead of trusting us. Where a volunteer clinician has reviewed a page, their name and credentials appear on it; where no name appears, no clinician has checked it. We are glad to have reviewers and are recruiting them, and we do not hold pages back waiting for one. Use this site to understand your situation and to ask better questions of the people treating you.
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