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Vol. 72, No. 2, 1996
Issue release date: 1996
Nephron 1996;72:237–242

Steroid Therapy during the Early Stage of Progressive IgA Nephropathy

A 10-Year Follow-Up Study

Kobayashi Y. · Hiki Y. · Kokubo T. · Horii A. · Tateno S.
Department of Medicine, School of Medicine and Nursing, Kitasato University, Kanagawa, Japan

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This study was undertaken to clarify the effect of corticosteroids on the long-term clinical course of the early stage of progressive IgA nephropathy. The early stage of progressive IgA nephropathy was defined as having moderate proteinuria between 1 and 2 g/day, creatinine clearance values of 70 ml/min or more, and a histological severity score of 7 or more. The number of patients who fulfilled these three conditions during 12 years from 1972 and then were continuously followed up for 10 years or more in our renal unit was 46. Twenty of them received steroid treatment for an average period of 18 months, and the remaining 26 patients had no steroid treatment. The initial data of proteinuria, creatinine clearance values, frequency of hypertensive cases, and histological scores of 7 or more were not different between the two groups: 1.4 ± 0.4 vs. 1.3 ± 0.3 g/day, 85 ± 14 vs. 88 ± 13 ml/min, 25 vs. 38%, and 10.7 ± 2.5 vs. 11.0 ± 3.0, respectively. During the follow-up period of 10 years, the renal survival rate was significantly different between the two groups (100 vs. 84% 5 years after starting therapy and 80 vs. 34% 10 years later; p < 0.001). The final creatinine clearance values were significantly different between the two groups (54 ± 35 vs. 20 ± 29 ml/min; p < 0.005). On the other hand, the patient groups with mild histological changes or decreased renal function due to moderate proteinuria showed no significant differences in the final outcome. These results indicate that corticosteroids are beneficial in stabilizing the renal function for a long time during the early stage of progressive IgA nephropathy, although this study was not a randomized one.

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