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Lupus nephritis (LN) is a major cause of morbidity and mortality in systemic lupus erythematosus (SLE).1 As previously described, LN occurs more frequently in Hispanic and African-American people in the multiethnic US LUMINA (Lupus in Minorities: Nature vs Nurture) cohort.2 With more patients (one-third) and years of observation (2949.3 patient-years from enrolment or baseline), we have now examined whether LN occurs earlier in the disease course in these patients relative to Caucasians. Four hundred and forty-nine patients (American College of Rheumatology (ACR) criteria, age ≥16 years, disease duration ≤5 years, predominantly women) were studied. Time-to-LN (ACR criterion (persistent proteinuria >0.5 g/day or ≥3 if quantitation not performed or cellular casts)) from baseline (incident cases) was examined by multivariable Cox proportional hazards regression adjusting for pertinent …
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