title: Oliguria as an early indicator of mortality risk in patients with multiple myeloma and renal impairment.
abstract: BACKGROUND
  A change in urine output has been recently recognized as a valuable biomarker of acute kidney injury that is associated with mortality in critically ill patients. We investigated the prognostic impact of oliguria for survival outcomes in multiple myeloma (MM) patients presenting with renal impairment (RI).
  
  
  METHODS
  Retrospective data on 98 patients with MM and RI, who received initial treatment with novel therapies, were analyzed. Oliguria was defined as a urine output of <0.5 mL/kg/h.
  
  
  RESULTS
  The baseline median eGFR was 39.7 mL/min (range, 5.1-59.8). Achievement of renal complete response (CR) was observed in 39.8% of patients. Nine patients (9.2%) presented with oliguria at initial diagnosis, and 4 initially required dialysis. Over a median follow-up period of 17.1 months (range, 1.7-100.0), the median overall survival (OS) was 38.7 months (95% CI 25.0-52.5). Multivariate analyses indicated that oliguria at diagnosis [hazard ratio (HR) 3.628, 95% CI 1.366-9.849, P=0.011], and thrombocytopenia <100×10(9)/L at diagnosis (HR 2.534, 95% CI 1.068-6.015, P=0.035), were significantly associated with overall survival.
  
  
  CONCLUSIONS
  Oliguria was significantly associated with higher mortality in MM patients with RI. Therefore, close monitoring of urine output could be important for these patients.
authors.affiliation: Department of Hematology-Oncology, Chonnam National University Hwasun Hospital, Hwasun, Korea.
authors.forename: Sung-Hoon
authors.initials: SH
authors.lastname: Jung
authors.affiliation: Department of Hematology-Oncology, Chonnam National University Hwasun Hospital, Hwasun, Korea.
authors.forename: Jae-Sook
authors.initials: JS
authors.lastname: Ahn
authors.affiliation: Department of Hematology-Oncology, Chonnam National University Hwasun Hospital, Hwasun, Korea.
authors.forename: Deok-Hwan
authors.initials: DH
authors.lastname: Yang
authors.affiliation: Department of Hematology-Oncology, Chonnam National University Hwasun Hospital, Hwasun, Korea.
authors.forename: Min-Seok
authors.initials: MS
authors.lastname: Cho
authors.affiliation: Department of Hematology-Oncology, Chonnam National University Hwasun Hospital, Hwasun, Korea.
authors.forename: Jae-Yong
authors.initials: JY
authors.lastname: Kim
authors.affiliation: Department of Hematology-Oncology, Chonnam National University Hwasun Hospital, Hwasun, Korea.
authors.forename: Seo-Yeon
authors.initials: SY
authors.lastname: Ahn
authors.affiliation: Department of Hematology-Oncology, Chonnam National University Hwasun Hospital, Hwasun, Korea.
authors.forename: Yeo-Kyeoung
authors.initials: YK
authors.lastname: Kim
authors.affiliation: Department of Hematology-Oncology, Chonnam National University Hwasun Hospital, Hwasun, Korea.
authors.forename: Hyeoung-Joon
authors.initials: HJ
authors.lastname: Kim
authors.affiliation: Department of Hematology-Oncology, Chonnam National University Hwasun Hospital, Hwasun, Korea.
authors.forename: Je-Jung
authors.initials: JJ
authors.lastname: Lee
keywords: Multiple myeloma; Oliguria; Renal insufficiency