Abstract
Background A 59-year-old man who had undergone a left nephrectomy for renal cell carcinoma was found to have metastatic disease during a restaging examination. The patient was started on treatment with interferon α2b plus bevacizumab, a humanized monoclonal anti-vascular endothelial growth factor antibody. After 9 months of this therapy, the patient developed proteinuria, which gradually increased to over 6 g/day.
Investigations Physical examination, urine and blood analysis, biopsy of the right kidney, and histologic evaluation of the non-neoplastic portion of the left nephrectomy specimen.
Diagnosis Thrombotic microangiopathy and IgA immune-complex deposition in the glomerular capillary walls and mesangium.
Management Discontinuation of interferon α2b and bevacizumab, control of blood pressure with an angiotensin-converting-enzyme inhibitor and an angiotensin-receptor blocker.
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Roncone, D., Satoskar, A., Nadasdy, T. et al. Proteinuria in a patient receiving anti-VEGF therapy for metastatic renal cell carcinoma. Nat Rev Nephrol 3, 287–293 (2007). https://doi.org/10.1038/ncpneph0476
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DOI: https://doi.org/10.1038/ncpneph0476
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