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Background and Objectives: Glomerular C4d deposits are associated the severity and outcomes of IgA nephropathy. Whether this holds true in immunoglobulin A vasculitis (IgAV) is not known. The main objective of the study was to analyze the prognostic value of glomerular C4d immunolabelling on kidney impairment in adults with IgAV. Design, Setting, Participants, Measurements: This retrospective cohort study included 120 adults with IgAV and a kidney biopsy performed between 1995 and 2018 in two French university hospital centers. All paraffin-embedded biopsies were reassessed according to Oxford classification. Immunofluorescence for C4d was performed in all cases. For analysis, patients were grouped according to positivity for C4d in the glomerular area. The main outcome was a composite endpoint of 50% increase in 24 h-proteinuria, or eGFR decrease by 50%, or kidney replacement therapy. Results: The median follow-up was 28.3 months. Twenty-three patients met the composite endpoint, 12 for kidney replacement therapy, 6 for an eGFR decrease >50% and 5 for a >50% increase in proteinuria. At time of biopsy, the median proteinuria was 1.9 g/24 h and the median eGFR 73.5 mL/min/1.73 m2. Among the 102 patients evaluable for C4d, 24 were positive on >30% glomeruli, mainly with a parieto-mesangial pattern. In this group, the initial proteinuria was more frequently nephrotic than in the C4d- group (60% vs. 33%, P = 0.039). Mesangial hypercellularity was more frequent in the C4d+ group (42% vs. 13%; P = 0.006) whereas macroscopic hematuria was more frequent in the C4d- group (18% vs. 0%; P = 0.03). After a median follow-up of 28 months, kidney survival did not differ according to C4d status. Conclusion: In a population of adult IgAV patients, glomerular positivity for C4d was associated with the severity of the kidney disease at presentation, but not with subsequent renal function deterioration.
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INTRODUCTION: The profession of pathologist exposes to various risks, notably infectious, physical and chemical. The objective of this study was to make an inventory of these occupational risks to which pathologists are subjected and to evaluate the pathologies that they presented. A particular attention was given to microscopic and screen work as they can induce musculoskeletal or ophthalmic disorders, and stress-related psychological disorders. METHOD: An anonymous online questionnaire containing 54 questions had been sent by mail to pathologists via the French Society of Pathology and the Syndicate of French Pathologists. RESULTS: Five hundred and twelve pathologists responded to the survey. Thirty-eight percent reported musculoskeletal disorders in the last 6 months. Visual disturbances concerned 73.4% of respondents. In the last 12 months, 33.3% of pathologists had been injured or had had mucosal projections during macroscopic or autopsy specimens. The frequency of infectious diseases was low (6.2%) as well as that of cancers (3.9%). Psychological disorders such as depression or burnout were reported by 16.7% of respondents. Pathologists seemed happy at work and had a good overall lifestyle. Few doctors had medical follow-up and few had benefited from ergonomic advice and training on the risks of chemicals. CONCLUSION: The results of this study showed the interest of a medical surveillance adapted to the pathologies presented by the pathologists. Educational and preventive measures should be introduced early in the career, focusing on ergonomics and learning about chemical and biological hazards.