Tianjin Medical Journal ›› 2023, Vol. 51 ›› Issue (8): 878-882.doi: 10.11958/20221789

• Clinical Research • Previous Articles     Next Articles

The difference between simple membranous nephropathy and simple membranous nephropathy combined with unknown monoclonal immunoglobulinemia

GAO Ge(), ZHANG Xinyue, DONG Yijun, CHENG Genyang()   

  1. Department of Nephrology, the First Affiliated Hospital of Zhengzhou University, Zhengzhou 450052, China
  • Received:2022-11-14 Revised:2023-03-06 Published:2023-08-15 Online:2023-08-10
  • Contact: E-mail: zdchengrooter@zzu.edu.cn

Abstract:

Objective To explore the difference in clinical pathological characteristics and short-term prognosis between patients with simple membranous nephropathy (MN) and patients with MN complicated with monoclonal gammopathy of undetermined significance (MGUS). Methods Forty-one patients diagnosed with MN combined with MGUS (the MN combined with MGUS group) and 81 patients with simple MN (the simple MN group) diagnosed by renal biopsy were selected in this study. General data and laboratory indicators were collected in the two groups, including white blood cell count (WBC), hemoglobin (Hb), platelet (PLT), urea nitrogen (BUN), serum creatinine (Scr), C-reactive protein (CRP), erythrocyte sedimentation rate (ESR) and glomerular filtration rate (eGFR). Indirect immunofluorescence assay was used to detect serum anti-M-type phospholipase A2 receptor (PLA2R) antibody. M protein typing in patients with MN and MGUS was determined by immunofixation electrophoresis. The difference of pathological data was compared between the two groups. The treatment effect and adverse reactions of patients were followed up. Results Compared with the simple MN group, Hb, PLT, eGFR anti-PLA2R antibody were lower in the MN combined with MGUS group, while expression levels of BUN, Scr, CRP and ESR were higher (P<0.05). Most monoclonal immunoglobulins in patients with MN complicated with MGUS were IgG type [41.5% (17/41)]. There was no significant difference in pathological data between the two groups (P>0.05). Thirty-five patients in the MN combined with MGUS group and 74 patients in the simple MN group were followed up respectively. The remission rate after treatment in the MN combined with MGUS group was lower than that in the simple MN group [62.9% (22/35) vs. 78.4% (58/74), χ2=3.884, P<0.05]. The Kaplan-Meier curve showed that the cumulative complete remission rate of the MN combined with MGUS group was lower than that of the simple MN group (Log-rank χ2=8.943, P<0.01). There was no significant difference in the incidence of adverse reactions between the two groups (P>0.05). Conclusion Compared with simple MN patients, patients with MN and MGUS have worse baseline renal function and a lower post-treatment renal response rates.

Key words: membranous nephropathy, monoclonal gammopathy, renal remission rate

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