Risk factors for multiple myeloma
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multiple myeloma risk factors etiology epidemiology
Harrison's Principles of Internal Medicine, Twenty First Edition
Page 3354
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multiple myeloma MGUS progression age race radiation chemical exposure
Harrison's Principles of Internal Medicine, Twenty First Edition
Page 3332
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Based on retrieved content and comprehensive medical knowledge, here is a thorough overview of risk factors for multiple myeloma (MM).
Risk Factors for Multiple Myeloma
Precursor Conditions
The most significant risk factor for MM is the presence of a precursor plasma cell dyscrasia. All cases of MM are preceded by one of these states (Harrison's, p. 3332):
| Precursor | Risk of Progression to MM |
|---|---|
| MGUS (Monoclonal Gammopathy of Undetermined Significance) | ~1% per year |
| SMM (Smoldering Multiple Myeloma) | Up to 76% over 5 years (high-risk) |
Higher-risk MGUS features (60% progression over 20 years if all three present):
- Non-IgG subtype
- Abnormal kappa/lambda free light chain ratio
- Serum M protein >15 g/L
Higher-risk SMM features (76% progression in 5 years if all three present):
- Bone marrow plasmacytosis >10%
- Abnormal kappa/lambda free light chain ratio
- Serum M protein >30 g/L
Demographic & Non-Modifiable Risk Factors
| Factor | Details |
|---|---|
| Age | Median age at diagnosis ~70 years; rare before age 40 |
| Sex | Slightly more common in males (M:F ~1.4:1) |
| Race/Ethnicity | African Americans have 2–3× higher incidence than whites; lower incidence in Asians |
| Family history | First-degree relatives of MM patients have increased risk (~2–4× elevated); MGUS also clusters in families |
Environmental & Occupational Exposures
| Exposure | Evidence |
|---|---|
| Ionizing radiation | Increased risk in atomic bomb survivors and radiation workers |
| Agricultural chemicals | Pesticides, herbicides (e.g., glyphosate, organochlorines) linked to elevated risk |
| Benzene and petroleum products | Occupational exposure associated with higher incidence |
| Heavy metals | Some evidence for arsenic, cadmium exposure |
| Hair dyes | Modest association in some studies |
Lifestyle & Medical Factors
- Obesity: Elevated BMI is an established risk factor, possibly mediated through increased IL-6 and adipokine signaling promoting plasma cell proliferation.
- Chronic immune stimulation: Autoimmune conditions (e.g., rheumatoid arthritis, Sjögren syndrome) and chronic infections may increase risk.
- HIV infection: Associated with modestly increased MM risk, possibly through chronic B-cell stimulation.
Genetic & Molecular Factors
- Chromosomal abnormalities: Key initiating events include:
- Translocations involving the immunoglobulin heavy chain locus (14q32): t(11;14), t(4;14), t(14;16), t(14;20)
- Hyperdiploidy (odd-numbered chromosomal gains)
- Deletions: del(17p) (TP53), del(13q) are common and confer worse prognosis
- Germline variants: Some inherited variants in genes involved in immune regulation may predispose to MGUS/MM
Summary
The dominant risk pathway is: genetic/environmental trigger → MGUS → SMM → MM. The most actionable risk factors are monitoring of MGUS/SMM progression features, with age, Black race, obesity, and certain occupational exposures representing the primary population-level risk determinants.
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