{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,10]],"date-time":"2026-08-10T14:42:20Z","timestamp":1786372940600,"version":"build-2736575974"},"reference-count":41,"publisher":"Ovid Technologies (Wolters Kluwer Health)","issue":"4","funder":[{"DOI":"10.13039\/100019531","name":"Apellis Pharmaceuticals","doi-asserted-by":"crossref","id":[{"id":"10.13039\/100019531","id-type":"DOI","asserted-by":"crossref"}]},{"DOI":"10.13039\/501100012112","name":"Swedish Orphan Biovitrum","doi-asserted-by":"crossref","id":[{"id":"10.13039\/501100012112","id-type":"DOI","asserted-by":"crossref"}]},{"DOI":"10.13039\/501100009703","name":"Fondazione per la Ricerca Biomedica","doi-asserted-by":"crossref","award":["Project ERAPERMED2020-151, GA 779282"],"award-info":[{"award-number":["Project ERAPERMED2020-151, GA 779282"]}],"id":[{"id":"10.13039\/501100009703","id-type":"DOI","asserted-by":"crossref"}]},{"DOI":"10.13039\/501100002426","name":"Fondazione Telethon","doi-asserted-by":"crossref","id":[{"id":"10.13039\/501100002426","id-type":"DOI","asserted-by":"crossref"}]},{"DOI":"10.13039\/501100003196","name":"Ministero della Salute","doi-asserted-by":"crossref","award":["Project COMPRare EJP RD JTC-2022"],"award-info":[{"award-number":["Project COMPRare EJP RD JTC-2022"]}],"id":[{"id":"10.13039\/501100003196","id-type":"DOI","asserted-by":"crossref"}]},{"name":"Progetto DDD Onlus-Associazione per la lotta alla DDD"},{"DOI":"10.13039\/501100006392","name":"Lausanne University Hospital","doi-asserted-by":"crossref","id":[{"id":"10.13039\/501100006392","id-type":"DOI","asserted-by":"crossref"}]},{"name":"SICPA foundation"}],"content-domain":{"domain":["lww.com","ovid.com"],"crossmark-restriction":true},"short-container-title":["CJASN"],"published-print":{"date-parts":[[2026,4]]},"abstract":"<jats:sec>\n                    <jats:title>Key Points<\/jats:title>\n                    <jats:p>\n                      <jats:list list-type=\"bullet\">\n                        <jats:list-item>\n                          <jats:p>This retrospective study analyzed clinical, histological, and biochemical data from a large cohort of participants with biopsy-proven primary C3 glomerulopathy\/immune complex-mediated membranoproliferative GN.<\/jats:p>\n                        <\/jats:list-item>\n                        <jats:list-item>\n                          <jats:p>C3 glomerulopathy and immune complex-mediated membranoproliferative GN subjects shared most baseline and longitudinal features; 10-year kidney survival did not differ across histological subtypes.<\/jats:p>\n                        <\/jats:list-item>\n                        <jats:list-item>\n                          <jats:p>Older age at onset and higher proteinuria levels at 1 year from biopsy were the strongest predictors of kidney failure.<\/jats:p>\n                        <\/jats:list-item>\n                      <\/jats:list>\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Background<\/jats:title>\n                    <jats:p>Membranoproliferative glomerulonephritides (MPGNs) are defined by a typical glomerular histopathological pattern including C3 glomerulopathy (C3G) and immune complex-mediated MPGN (IC-MPGN). The overall prognosis is poor and the treatment options remain limited. Outcome predictors and reliable surrogate endpoints are critically needed for interventional trials. Herein, we described the natural history and analyzed clinical, histological and biochemical data from a large cohort of patients with primary C3G\/IC-MPGN.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods<\/jats:title>\n                    <jats:p>\n                      This is a retrospective analysis of patients with biopsy-proven primary C3G or IC-MPGN from the Italian Registry of MPGN. Demographic, clinical and histopathological data, molecular complement profiles, treatment patterns, and outcomes were collected. We performed univariable and multivariable Cox regressions and Kaplan\u2013Meier survival analyses to assess risk associations with kidney disease progression. The composite endpoint included ESKD (defined by either eGFR &lt;15 ml\/min per 1.73 m\n                      <jats:sup>2<\/jats:sup>\n                      , initiation of chronic dialysis or kidney transplantation), doubling of serum creatinine at the last available follow-up, or death by kidney-related causes.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>\n                      Of the 349 patients identified, 208 had C3G and 141 IC-MPGN. Females were 41%, and over half were younger than 18 years old at time of biopsy. C3G and IC-MPGN patients shared most baseline and longitudinal features, with IC-MPGN patients presenting with higher baseline proteinuria (median 4.0 versus 2.3 g\/24 hours,\n                      <jats:italic toggle=\"yes\">P<\/jats:italic>\n                      &lt; 0.001). Median eGFR at presentation was 83 ml\/min per 1.73 m\n                      <jats:sup>2<\/jats:sup>\n                      . Twenty-six percent of patients progressed to ESKD over a median follow-up of 5 years from diagnosis. Higher proteinuria levels at 1 year from biopsy, particularly \u22651 g\/24 hours, were significantly associated with a higher risk of adverse kidney outcomes. Pediatric onset was associated with better kidney survival, whereas kidney survival at 10 years did not statistically differ across histological subtypes. Complement dysregulation and rare functional variants in complement genes were not associated with outcomes.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusions<\/jats:title>\n                    <jats:p>Our findings from a large and well-characterized cohort of individuals with primary C3G\/IC-MPGN identify age at onset and proteinuria levels as associations with kidney survival, a finding that should inform future interventional trials.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.2215\/cjn.0000000953","type":"journal-article","created":{"date-parts":[[2025,12,23]],"date-time":"2025-12-23T17:00:35Z","timestamp":1766509235000},"page":"626-640","update-policy":"https:\/\/doi.org\/10.1097\/lww.0000000000001000","source":"Crossref","is-referenced-by-count":2,"title":["Natural History and Clinical Associations with Long-Term Outcomes in Primary C3 Glomerulopathy and Immune Complex-Mediated Membranoproliferative GN"],"prefix":"10.2215","volume":"21","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-8522-7524","authenticated-orcid":false,"given":"Giliane","family":"Nanchen","sequence":"first","affiliation":[{"name":"Clinical Research Center for Rare Diseases \u201cAldo e Cele Dacc\u00f2\u201d, Istituto di Ricerche Farmacologiche Mario Negri IRCCS, Bergamo, Italy"},{"name":"Service of Nephrology and Hypertension, Department of Medicine, Lausanne University Hospital and University of Lausanne, Lausanne, Switzerland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0712-2329","authenticated-orcid":false,"given":"Maddalena","family":"Maras\u00e0","sequence":"additional","affiliation":[{"name":"Clinical Research Center for Rare Diseases \u201cAldo e Cele Dacc\u00f2\u201d, Istituto di Ricerche Farmacologiche Mario Negri IRCCS, Bergamo, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Matteo","family":"Breno","sequence":"additional","affiliation":[{"name":"Clinical Research Center for Rare Diseases \u201cAldo e Cele Dacc\u00f2\u201d, Istituto di Ricerche Farmacologiche Mario Negri IRCCS, Bergamo, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Carolina","family":"Martinatto","sequence":"additional","affiliation":[{"name":"Clinical Research Center for Rare Diseases \u201cAldo e Cele Dacc\u00f2\u201d, Istituto di Ricerche Farmacologiche Mario Negri IRCCS, Bergamo, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5849-0418","authenticated-orcid":false,"given":"Miriam","family":"Rigoldi","sequence":"additional","affiliation":[{"name":"Clinical Research Center for Rare Diseases \u201cAldo e Cele Dacc\u00f2\u201d, Istituto di Ricerche Farmacologiche Mario Negri IRCCS, Bergamo, 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