Renal microangiopathy and immune complex glomerulonephritis induced by anti-tumour agents: A case report.

A 60-year-old woman with bilateral lower extremity oedema for several days was admitted to the hospital on 21 November 2023. Previously, after receiving rectal cancer resection in February 2023, she had been receiving drug chemotherapy, during which she had normal urinalysis and renal function. However, 10 days before admission, after the drug regimen was adjusted to tislelizumab + fruquintinib, she developed bilateral lower extremity oedema with foamy urine; this was later extended to facial oedema. After a histologic examination of renal biopsy, it was judged as drug-induced glomerular microangiopathy (GMA) with focal segmental glomerulosclerosis-like lesions accompanied by immune complex-mediated glomerulonephritis. The condition was controlled by stopping the anti-tumour drug, lowering glucose with linagliptin, and providing renal protection with Nephritis Rehabilitation Tablets, and the patient recovered well at the follow-up visit after 6 months. This case may be GMA induced by tislelizumab or fruquintinib and was examined in this study.