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Complete Clq deficiency associated with IgG multiple myeloma.
S Tokumitsu1, Y Furuta, T Kobayashi
1Department of Internal Medicine, Kawasaki Hospital, Kawasaki Medical School, Okayama, Japan.
Japanese Journal of Medicine
|March 1, 1989
Summary
This study details a rare case of IgG multiple myeloma in a 75-year-old woman with a complete deficiency in complement component 1q (Clq). Restoring Clq levels normalized her immune function, suggesting a primary deficiency.
Area of Science:
- Immunology
- Hematology
- Complement System
Background:
- Multiple myeloma is a plasma cell malignancy.
- The complement system is crucial for immune response.
- Complement component 1q (Clq) initiates the classical complement pathway.
Observation:
- A 75-year-old Japanese woman presented with urticaria and absent serum hemolytic complement activity (CH50).
- She had IgG multiple myeloma and a selective complete deficiency of Clq.
- No vasculitis was observed in the urticarial lesion.
Findings:
- The patient's serum showed a complete absence of Clq without low molecular weight Clq precipitin.
- Addition of purified Clq to her serum restored normal CH50 levels.
- The condition was likely a primary Clq deficiency.
Implications:
- This case highlights a potential link between multiple myeloma and primary Clq deficiency.
- Understanding this association may offer new insights into complement system disorders.
- Further research is warranted to explore the relationship between Clq deficiency and hematological malignancies.