An update of proliferative glomerulonephritis with monoclonal immunoglobulin deposits.

As aging increases, monoclonal gammopathy is becoming more common and monoclonal gammopathy of renal significance (MGRS) is gaining attention due to frequent renal involvement. Within MGRS, proliferative glomerulonephritis with monoclonal immunoglobulin deposits (PGNMID) is a special category. The disease was first described in 2004 and the research history on it is relatively short. Compared with other MGRS, the detection rate of circulating clones is lower in patients with PGNMID, which is easy to miss and misdiagnose in clinical work. In this review, the etiology and clinical features of PGNMID are discussed. It is noted that PGNMID is associated not only with MGRS, but also with malignancy, infection and other factors. PGNMID is not a disease exclusive to the elderly-young people can also develop this disease. Due to the low detection rate of circulating clones in most patients, confirmation of the disease needs to be combined with renal pathology, which emphasizes the importance of completing light and heavy chain subtype staining. Treatment options for patients with PGNMID differ by etiology. For MGRS-associated PGNMID, the current treatment is primarily empirical and more research evidence is needed to fill the treatment gap.