Background: In 2011, the Japanese Society of Nephrology (JSN) published new clinical guidelines for IgA nephropathy (IgAN) with a new risk stratification based on clinical and histological severity. For classification, patients are divided into four groups (low, medium, high, and very high risk). However, differences in responsiveness to each treatment among different groups remain unclear. We evaluate the responsiveness of tonsillectomy plus steroid pulse (TSP) therapy using the new risk stratification.

Methods: We retrospectively reviewed 111 IgAN patients with TSP therapy between January 2003 and January 2013. Study patients were divided into three groups [low- (n = 40), medium- (n = 43) and high-/very high-risk group (n = 28)]. The primary outcome was clinical remission (CR). The observation period was 1 year following tonsillectomy.

Results: 57 out of 111 patients (51.4 %) reached CR. The CR incidence was 70.0, 41.9 and 39.3 % (the low-, the medium- and the high-/very high-risk group, respectively). The incidence of CR was significantly higher in the low-risk group (P = 0.013). In a multivariate logistic regression analysis, both the medium- and the high-/very high-risk group showed significantly lower incidence of inducing CR than the low-risk group [(odds ratio 0.324; 95 % confidence interval 0.106-0.939, P = 0.041) (odds ratio 0.239; 95 % confidence interval 0.058-0.910, P = 0.040), respectively].

Conclusions: The new risk stratification in the 2011 JSN clinical guidelines for IgAN had a positive impact on early CR of TSP therapy.

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http://dx.doi.org/10.1007/s10157-014-1052-4DOI Listing

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