title: Renal involvement in a large cohort of Chinese patients with Castleman disease.
abstract: BACKGROUND
  The association of kidney disease with Castleman disease (CD) is uncommon. To date, most studies have been based on single-case reports. Here, we describe renal involvement in CD in a large Chinese cohort.
  
  
  METHODS
  Seventy-six CD patients were identified in one clinical center. Clinical and pathological characteristics of patients with renal involvement were described, which were also compared with cases identified through a systematic literature review.
  
  
  RESULTS
  Nineteen patients (25%) exhibited renal involvement. Patients with multicentric clinical type (59 versus 0%) or plasma cell (PC)/mixed cellularity histological variant (61.5 versus 6%) were more likely to have renal involvement (P < 0.001). Proteinuria (with 7/19 reaching nephrotic range) and acute renal failure (12/19, 63%) were the main clinical presentations. Kidney biopsy revealed various glomerular diseases (10/11) and interstitial nephritis (1/11), while with 'thrombotic microangiopathy-like' lesions were the most common pathological characteristics (6/11, 55%). This contrasted significantly with the literature in which amyloidosis was the most reported. Renal outcomes responded well to chemotherapy. Nine (9/12, 75%) patients with acute renal failure recovered completely, one recovered partially. Overall, only three (3/19, 16%) patients progressed to end-stage kidney disease. Renal involvement did not influence survival rate (log-rank test, P = 0.73) in the follow-up.
  
  
  CONCLUSIONS
  CD with multicentric type and PC or mixed cellularity variant are often associated with renal complications. Thrombotic microangiopathy-like lesions are the most common pathological characteristics. Chemotherapy can reverse kidney damage in most cases.
authors: Renal Division, Department of Medicine, Peking University First Hospital, Institute of Nephrology, Peking University, Beijing, China
authors: Damin
authors: D
authors: Xu
authors: Jicheng
authors: J
authors: Lv
authors: Yujun
authors: Y
authors: Dong
authors: Suxia
authors: S
authors: Wang
authors: Tao
authors: T
authors: Su
authors: Fude
authors: F
authors: Zhou
authors: Wanzhong
authors: W
authors: Zou
authors: Minghui
authors: M
authors: Zhao
authors: Hong
authors: H
authors: Zhang