Abstract
Objectives
Anti-neutrophil cytoplasmic antibody (ANCA)-associated vasculitis (AAV) is a systemic vasculitis with unknown aetiology. Although biopsies are helpful for diagnosing AAV, whether they improve the outcomes of AAV patients remains unknown. The objective of this study was to elucidate the association between biopsies and prognosis.
Method
This retrospective cohort study analysed health care records that were routinely collected at 190 hospitals in Japan from April 2005 to March 2019. Patients who were 18 years or older and hospitalized for AAV were eligible for inclusion. The primary outcome was the composite outcome of death and renal replacement therapy (RRT) during the first admission. We compared the outcome between the biopsy group and the no-biopsy group. The chi-square test was performed as a univariable analysis, and logistic regression analysis was performed as a multivariable analysis.
Results
Three hundred and eighty-six patients were assessed in this study. One hundred fifty-four (39.9%) patients underwent biopsy, and 232 (60.1%) patients did not undergo biopsy during the first admission with AAV. In univariable analysis, the composite outcome of death and RRT were observed in 7 (4.5%) patients in the biopsy group and 25 (10.8%) patients in the no-biopsy group (OR 0.39 [95% CI 0.17, 0.94], P = 0.01). The result was consistent in the multivariable analysis (OR 0.31 [95% CI 0.12, 0.79], P = 0.01) after adjusting for potential confounders.
Conclusions
We showed that patients who underwent biopsy had a better prognosis in the composite outcome of mortality and RRT during admission using a Japanese healthcare record database.
Key Points • This is the first study to elucidate the association between undergoing biopsy and prognosis. • Patients undergoing biopsy had a better prognosis in the composite outcome of mortality and RRT. • The proportion of patients who received transfusions was not significantly different between the two groups. |
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Acknowledgements
We acknowledge HCEI, which provided data to us.
Funding
This work was supported by a Grant-in-Aid for Scientific Research from the Japan Society for the Promotion of Science (grant number 20H03941).
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HH conducted the analysis and wrote the first draft of the manuscript. MT commented on the analysis and redrafted the manuscript. KK advised on the analysis and study design. HH and MT contributed to the study conception and design. HH contributed to the analysis and interpretation of data. The first draft was written by HH, and all authors commented and revised the draft. The authors read and approved the final manuscript.
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This study was approved by the Institutional Review Board at Kyoto University. We performed this study in accordance with the ethical standards laid down in the 1964 Declaration of Helsinki and its later amendments. This study did not need individual consent because the data were anonymized.
Competing interests
Koji Kawakami has received research funds from Eisai Co. Ltd.; Kyowa Kirin Co. Ltd.; Sumitomo Dainippon Pharma Co. Ltd.; Pfizer Inc.; Stella Pharma Corporation; CMIC Co. Ltd.; Suntory Beverage & Food Ltd.; Mitsubishi Corporation, and Real World Data Co. Ltd.; consulting fees from LEBER Inc.; JMDC Inc.; Shin Nippon Biomedical Laboratories Ltd.; Kaken Pharmaceutical Co. Ltd.; and Advanced Medical Care Inc.; executive compensation from Cancer Intelligence Care Systems; Inc.; honorarium from Mitsubishi Chemical Holdings Corporation, Mitsubishi Corporation, and Pharma Business Academy; and holds stock in Real World Data Co. Ltd. Other authors declare no competing interests.
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Hashimoto, H., Takeuchi, M. & Kawakami, K. Association between biopsies for anti-neutrophil cytoplasmic antibody-associated vasculitis and prognosis: a retrospective cohort study. Clin Rheumatol 41, 541–548 (2022). https://doi.org/10.1007/s10067-021-05889-z
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DOI: https://doi.org/10.1007/s10067-021-05889-z