Abstract
Co-occurrence of anti-neutrophil cytoplasmic antibody (ANCA)-associated vasculitis (AAV) and IgA nephropathy (IgAN) is extremely uncommon. To date, only a few case reports have described such patients. Here, we describe the clinical presentation, pathologic features, treatment response, and outcome data of five patients with the rare form of co-existing AAV and IgAN and compared the characteristics of these patients to AAV patients with pauci-immune glomerulonephritis (n = 10) and IgAN patients (n = 10) that were selected as controls by stratified random sampling. In addition, we summarize all the previously reported cases of AAV and IgAN. In total, including the current study, 16 AAV/IgAN overlap cases were reported. Our five patients with the coexistence of AAV and IgAN were younger than the ten AAV patients with pauci-immune glomerulonephritis (22.6 ± 8.2 years versus 48.9 ± 15.7 years, respectively, P = 0.004). Histologically, they had a significantly lower percentage of glomeruli with fibrous crescents compared with AAV patients (0.0% versus 4.0%, P = 0.038). Compared with ten IgAN patients, our five AAV/IgAN patients had higher levels of ESR (P = 0.032) and CRP (P = 0.031). After accepting treatment with a combination of steroid and immunosuppressants, all patients showed a positive response to therapy, except for one patient in our cohort and another previously reported patient. We described the clinical presentation, pathologic features, treatment response, and outcome data of five patients with overlapping AAV and IgAN. They had mild glomerular pathological lesions and a positive response to aggressive immunosuppressive therapy. They were quite similar to pauci-immune AAV patients in clinical features, except for younger age. They had a lower percentage of glomeruli with fibrous crescents compared with AAV patients. In contrast to IgAN patients, they had higher levels of ESR and CRP. The mechanism of the coexistence of IgAN and AAV needs further study.
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Funding
This work was funded by the National Key R&D Program of China (2020YFC2005000 to XX), the Key Research and Development Program of Hunan province (2020WK2008 to YZ), the Science and Technology Innovation Program of Hunan Province (2020RC5002 to JO), the Natural Science Foundation of Hunan Province (2021JJ31130 to YZ and 2020JJ6109 to CS), “Yiluqihang Shenmingyuanyang” Medical Development and Scientific Research Fund Project on Kidney Diseases (SMYY20220301001 to YZ), and Scientific Research Program of Traditional Chinese Medicine in Hunan Province (201761 to XL).
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Y.Z., Q.X., R.T., T.M., W.L., and X.C.X. conceived and designed the research; Y.Z., Q.X., R.T., and X.C.X. wrote the paper; J.D.O., P.J.E., C.J.S., W.N.N., X.L., Q.L.Z., and P.X. revised the paper; Q.X., T.M., W.L., Y.Z., W.N.N., C.J.S., and X.L. collected the clinical and pathologic parameters of patients; Q.X., Y.Z., R.T., T.M., J.B.C, and W.L. analyzed data; all authors approved the final version of the manuscript.
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The study was approved by the Medical Ethics Committee of the Xiangya Hospital of Central South University for Human Studies (approval number 201711836). Additional informed consent was obtained from all individual participants for whom identifying information is included in this article.
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Xiong, Q., Lin, W., Shen, C. et al. Coexistence of antineutrophil cytoplasmic antibody (ANCA)-associated vasculitis (AAV) and IgA nephropathy. Immunol Res 71, 1–14 (2023). https://doi.org/10.1007/s12026-022-09322-8
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DOI: https://doi.org/10.1007/s12026-022-09322-8