Supplementary Material for: Congenital Nephrotic Syndrome in India in the Current Era: A Multicenter Case Series

<b><i>Background:</i></b> There is a paucity of information on epidemiology, diagnosis, and treatment outcomes of congenital nephrotic syndrome (CNS) in developing countries. <b><i>Methods:</i></b> Retrospective (2012–2017) review of case records undertaken across 12 Indian pediatric nephrology centers. <b><i>Results:</i></b> Sixty-five children (58% male, median birth weight 2.4 kg [interquartile range (IQR) 2.1–2.86]) were identified with CNS. Nearly half (45%) were preterm with previous history of fetal loss/sibling death in 22% and history of consanguinity in a third. No infective etiology was confirmed. Genetic reports available for 15 (23%) children identified causal mutations in 10 (8 in NPHS1 [1 novel variant], 1 in WT 1 [novel variant], and 1 in PLCE-1 gene). In addition, 1 child was clinically diagnosed as Galloway Mowat syndrome. Next-generation sequencing showed 80% yield and Sanger sequencing 20%. Albumin infusion and angiotensin-converting enzyme inhibitors were used initially in around two-third of cohort, while only 12% of children received indomethacin. Totally, 22 (34%) children were lost to follow-up after initial visit, and among the rest median follow-up was 69 days (IQR 20–180) with 18 (42%) deaths. Eight children showed partial response (including 2 with NPHS1 compound mutation), 1 complete response, and all of them were alive at last follow-up in contrast to 53% mortality among nonresponders, <i>p</i> = 0.004. <b><i>Conclusion:</i></b> This largest reported series on CNS from India revealed suboptimal management with poor outcome as well as low number of CNS being subjected to genetic evaluation.