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Heavy Chain Deposition Disease: Clinicopathologic Characteristics of a Chinese Case Series
Yuan Zhang1, Xiaomei Li1, Dandan Liang1
1Jinling Hospital Department of Nephrology, Nanjing Medical University, Nanjing, PR, China.
Insights
Heavy chain deposition disease (HCDD) in Chinese patients primarily involves immunoglobulin G deposits. Chemotherapy improved kidney function, particularly in early-stage HCDD cases.
Area of Science:
- Nephrology
- Immunopathology
- Rare Diseases
Background:
- Heavy chain deposition disease (HCDD) is a rare complication of monoclonal immunoglobulin deposition disease.
- HCDD is poorly characterized in non-white populations, necessitating further investigation.
- This study focuses on the clinicopathologic features and outcomes of HCDD in Chinese individuals.
Purpose of the Study:
- To describe the clinicopathologic characteristics of HCDD in a Chinese cohort.
- To evaluate the outcomes and survival rates of HCDD patients.
- To identify potential therapeutic benefits, particularly chemotherapy, in managing HCDD.
Main Methods:
- A retrospective case series design was employed.
- Twenty-five patients with biopsy-proven HCDD at a single center in China were analyzed.
- Clinical data, laboratory results, kidney biopsy findings, and patient outcomes were reviewed.
Main Results:
- All 25 patients exhibited immunoglobulin G heavy chain deposition in kidney biopsies.
- Common clinical presentations included edema, anemia, hypertension, and impaired kidney function.
- Chemotherapy was associated with improved kidney survival, especially in early-stage disease.
Conclusions:
- Heavy chain deposition disease in this Chinese cohort is characterized by immunoglobulin G heavy chain deposits.
- Chemotherapy demonstrates a positive impact on kidney function and survival in HCDD patients.
- Early intervention with chemotherapy may be crucial for better outcomes in HCDD.
Rationale & Objective:
Heavy chain deposition disease (HCDD) is a rare consequence of monoclonal immunoglobulin deposition disease that has not been well characterized in non-white populations. To explore the clinicopathologic characteristics and outcomes of HCDD in Chinese individuals, we report on a case series assembled in a single center in China.
Study Design:
Case series.
Setting & Participants:
25 patients with biopsy-proven HCDD were studied retrospectively.
Results:
14 men and 11 women with an average age of 50.3 years were studied. The patients presented with hypertension (76%), edema (96%), anemia (84%), serum creatinine level > 1.2mg/dL (68%), nephrotic-range proteinuria (56%), and microscopic hematuria (80%). One (4%) patient had multiple myeloma diagnosed. Serum immunofixation electrophoresis showed that 10 of 21 (48%) patients were positive for monoclonal immunoglobulin. Hypocomplementemia of C3 was found in 68% of patients. Nodular mesangial sclerosis was identified in all patients by using light microscopy. Using immunofluorescence, all 25 patients had deposition of heavy chains of immunoglobulin G class (γ1, 13; γ2, 2; γ3, 6; γ4, 2; γ1 and γ4, 1; and γ2 and γ4, 1). During an average of 40.1 months of follow-up of 20 patients, 65% had improved kidney function, 10% had worsening kidney function, and 25% progressed to kidney failure. Mean values for kidney and patient survival were 37.8 and 40.1 months, respectively. Kidney survival was higher among patients who received chemotherapy.
Limitations:
Retrospective study, single-center experience.
Conclusions:
In this case series of HCDD in a single center in China, the heavy chain deposits seen in the kidney biopies of all individuals were of immunoglobulin G class. Chemotherapy improved kidney function, especially among individuals in an early stage of the disease.
