Work

Rituximab for the treatment of membranous nephropathy in a patient with ankylosing spondylitis: a case report

Year: 2026

Type: article

Abstract: Ankylosing spondylitis (AS) is a chronic inflammatory disease primarily affecting the axial skeleton. Renal involvement is uncommon in AS, occurring in only 5-13% of patients, with membranous nephropathy (MN) being particularly rare, with only 10 cases reported in PubMed to date. We report the case of a 37-year-old man with an 11-year history of AS who developed nephrotic syndrome during the stable phase of his disease. Renal biopsy confirmed MN, revealing IgG and C3 deposition along the glomerular capillary walls and subepithelial electron-dense deposits. After excluding secondary causes, rituximab was selected as the initial immunosuppressive therapy. Six months after treatment, the patient's 24-h urinary protein excretion decreased from 12.9 g to 836 mg, and serum albumin increased from 21.4 g/L to 35.4 g/L, achieving partial remission. This case provides additional clinical evidence of a potential association between AS and MN and demonstrates the efficacy and safety of rituximab in this rare clinical scenario, offering insight into potential treatment strategies.

Source: Frontiers in Medicine

DOI: 10.3389/fmed.2026.1757906

Authors: Rongzhen Zhong, Li Su, Hongxia Li, Hongyan Zhu, Zhiqing Xiao

Institution: Chinese PLA General Hospital

Language: English

Topic: Renal Diseases and Glomerulopathies

Subfield: Nephrology

Field: Medicine

Domain: Health Sciences

SDG: Good health and well-being

Open Access status: gold

Estimated APC paid: $3,801