Abstract
To characterize and compare the factors associated with tubulointerstitial inflammation (TII) and tubulointerstitial scarring, defined as interstitial fibrosis and/or tubular atrophy (IF/TA), in patients with lupus nephritis (LN). We identified systemic lupus erythematosus patients who had renal biopsy results consistent with LN between 2005 and 2017. Clinical data were collected from medical records. Multivariable logistic regression models were fitted to assess factors associated with TII and with IF/TA (moderate-to-severe versus none/mild). Of 203 LN patients included, 41 (20%) had moderate-to-severe TII, 45 (22%) had moderate-to-severe IF/TA, and 21 (10%) had both. Multivariable logistic regression models showed that moderate-to-severe TII was associated with a shorter disease duration, African American race, proliferative LN, and an estimated glomerular filtration rate (eGFR) of <60 ml/minute/1.73 m2 at the time of biopsy. Hydroxychloroquine use was associated with significantly lower odds of moderate-to-severe TII (odds ratio 0.27 [95% confidence interval 0.10-0.70], P = 0.008). Similar to TII, factors associated with moderate-to-severe IF/TA included proliferative LN and eGFR <60 ml/minute/1.73 m2 at the time of biopsy. ...Continue Reading
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