Persistent Disease Activity in Patients With Long-Standing Glomerular Disease
Delbarba E., Marasa M., Canetta PA., Piva SE., Chatterjee D., Kil BH., Mu X., Gibson KL., Hladunewich MA., Hogan JJ., Julian BA., Kidd JM., Laurin LP., Nachman PH., Rheault MN., Rizk DV., Sanghani NS., Trachtman H., Wenderfer SE., Gharavi AG., Bomback AS., Ahn W., Appel GB., Babayev R., Batal I., Brown E., Campenot ES., Canetta P., Chan B., D'Agati VD., Fernandez H., Foroncewicz B., Ghiggeri GM., Hines WH., Jain NG., Kiryluk K., Lau WL., Lin F., Lugani F., Markowitz G., Mohan S., Mucha K., Nickolas TL., Piva S., Radhakrishnan J., Rao MK., Sanna-Cherchi S., Santoriello D., Stokes MB., Yu N., Valeri AM., Zviti R., Greenbaum LA., Smoyer WE., Al-Uzri A., Ashoor I., Aviles D., Baracco R., Barcia J., Bartosh S., Belsha C., Bowers C., Braun MC., Chishti A., Claes D., Cramer C., Davis K., Erkan E., Feig D., Freundlich M., Gbadegesin R., Hanna M., Hidalgo G., Hunley TE., Jain A., Kallash M., Khalid M., Klein JB., Lane JC., Mahan J., Mathews N., Nester C., Pan C., Patterson L., Patel H., Revell A., Silva C., Sreedharan R., Srivastava T., Steinke J., Twombley K., Vasylyeva TL., Weaver DJ., Wong CS., Almaani S., Ayoub I., Budisavljevic M., Derebail V., Fatima H., Falk R.
© 2020 International Society of Nephrology Introduction: Glomerular diseases are characterized by variable disease activity over many years. We aimed to analyze the relationship between clinical disease activity and duration of glomerular disease. Methods: Disease activity in adults with chronic minimal change disease, focal segmental glomerulosclerosis, membranous nephropathy, and IgA nephropathy (IgAN; first diagnostic biopsy >5 years before enrollment; Of Longstanding Disease [OLD] cohort, n = 256) followed at Columbia University Medical Center (CUMC), was compared with disease activity of an internal and external cohort of patients with first diagnostic biopsy <5 years before enrollment drawn from the Cure Glomerulonephropathy Network (CureGN cohort, n = 1182; CUMC-CureGN cohort, n = 362). Disease activity was defined by (i) Kidney Disease: Improving Global Outcomes–recommended threshold criteria for initiation of immunosuppression in primary glomerulonephropathy (GN) and (ii) CureGN's Disease Activity Working Group definitions for activity. Results: No significant differences were detected among the 3 cohorts in terms of age, sex, serum creatinine, and urinary protein-to-creatinine ratio. For each GN subtype, disease activity in the OLD cohort was comparable with disease activity in the entire CureGN and the CUMC-CureGN cohort. When limiting our comparisons to disease activity in incident CUMC-CureGN patients (first diagnostic biopsy within 6 months of enrollment), OLD patients demonstrated similar activity rates as incident patients. Conclusion: Disease activity did not differ among patients with shorter versus longer duration of disease. Such survivor patients, with long-term but persistent disease, are potentially highly informative for understanding the clinical course and pathogenesis of GN and may help identify factors mediating more chronic subtypes of disease.