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Membranous nephropathy in Japan: analysis of the Japan Renal Biopsy Registry (J-RBR)

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Abstract

Membranous nephropathy (MN) is one of the most common causes of nephrotic syndrome in adults. The J-RBR/J-KDR registry developed by the Japanese Society of Nephrology provides nationwide cohort data for epidemiological studies of MN. MN was present in 36.8% of 1,203 primary nephrotic syndrome patients in Japan. In addition, 633 (77.9%) out of 813 MN patients were referred to as “idiopathic,” whereas 22.1% were classified as “secondary” and involved conditions such as systemic lupus erythematosus, drug exposure, infections, cancer, and various collagen diseases. The mean age of the MN patients was 62.2 (2–88) years old, their mean eGFR was 76.7 (7.6–154.6) ml/min/1.73 m2, and 63.3% had hypertension at the time of renal biopsy. On the basis of these findings, half of Japanese idiopathic MN patients have risk factors (age >60, male, or lower eGFR) for end-stage renal failure, and 10% belong to the high-risk group (daily proteinuria of over 8.0 g). Further studies with high-grade evidence should resolve the natural history and therapeutic problems of idiopathic MN in elderly Japanese.

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Acknowledgments

The authors greatly acknowledge the help and assistance of their colleagues at the centers and affiliated hospitals who helped with the data collection for the J-RBR/J-KDR. This study was supported in part by the committee of the Japanese Society of Nephrology and a Grant-in-Aid for Progressive Renal Disease Research from the Ministry of Health, Labour, and Welfare of Japan.

Conflict of interest

Three of the authors (HY, TT, and HS) have no conflicts of interest to disclose. One author (SH) was supported by Daiichi-Sankyo Co. Ltd.

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Correspondence to Hitoshi Yokoyama.

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This article is based on the studies first reported in Epidemiology of membranous nephropathy in Japan (in Japanese). Jpn J Nephrol 2011;53:677–83.

Appendix

Appendix

The following are the initial investigators and institutions who have participated in the project to develop the J-RBR since 2007:

Takao Saito (Fukuoka University), Yukimasa Kohda (Kumamoto University; present address, Hikarinomori Clinic), Shinichi Nishi (Niigata University; present address: Kobe University), Kazuhiko Tsuruya and Yutaka Kiyohara (Kyushu University), Hideyasu Kiyomoto (Kagawa University; present address: Tohoku University), Hiroyuki Iida (Toyama Prefectural Central Hospital), Tamaki Sasaki (Kawasaki Medical School), Makoto Higuchi (Shinshu University), Motoshi Hattori (Tokyo Women’s Medical University), Kazumasa Oka (Osaka Kaisei Hospital; present address: Hyogo Prefectural Nishinomiya Hospital), Shoji Kagami (The University of Tokushima Graduate School), Michio Nagata (University of Tsukuba), Tetsuya Kawamura (Jikei University School of Medicine), Masataka Honda (Tokyo Metropolitan Children’s Medical Center), Yuichiro Fukasawa (KKR Sapporo Medical Center; present address: Sapporo City Hospital), Atsushi Fukatsu (Kyoto University Graduate School of Medicine), Kunio Morozumi (Japanese Red Cross Nagoya Daini Hospital), Norishige Yoshikawa (Wakayama Medical University), Yukio Yuzawa (present address: Fujita Health University) and Seiichi Matsuo (Nagoya University Graduate School of Medicine), Kensuke Joh (Chiba-East National Hospital; present address: Sendai Shakai Hoken Hospital), Hirofumi Makino (Okayama University Graduate School of Medicine).

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Yokoyama, H., Taguchi, T., Sugiyama, H. et al. Membranous nephropathy in Japan: analysis of the Japan Renal Biopsy Registry (J-RBR). Clin Exp Nephrol 16, 557–563 (2012). https://doi.org/10.1007/s10157-012-0593-7

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