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Clinical role of albumin to globulin ratio in microscopic polyangiitis: a retrospective monocentric study

  • Sung Soo Ahn
  • Juyoung Yoo
  • Seung Min Jung
  • Jason Jungsik Song
  • Yong-Beom Park
  • Sang-Won Lee
Original Article
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Abstract

We investigated whether albumin to globulin ratio (AGR) at diagnosis may be associated with all-cause mortality in immunosuppressive drug-naïve patients with microscopic polyangiitis (MPA). We retrospectively reviewed the medical records of 88 MPA patients, who were first classified and in whom medications was first initiated in our tertiary Hospital. We collected clinical and laboratory data as well as the rate of all-cause mortality. AGR at diagnosis was calculated as a ratio of serum albumin over globulin fraction (protein–albumin). We compared variables between survived and deceased patients. The multivariable Cox hazard model was conducted to appropriately obtain the hazard ratios (HRs). The mean age at diagnosis was 56.3 years and 24 patients (27.3%) were men. Seven patients died for the mean follow-up period of 49.7 months. Deceased patients were elder than survived patients (P = 0.048). Five factor score (FFS) (2009) (P = 0.001), creatinine (P = 0.026) and AGR (P = 0.007) at diagnosis in deceased patients were higher than those in the survived. In the multivariable Cox hazard model analysis, only AGR at diagnosis (HR 0.004) was inversely associated with all-cause mortality during the follow-up. Furthermore, when the cutoff of AGR for death was set as 0.88, patients with AGR ≤ 0.88 exhibited the lower cumulative patients survival rate than those with AGR > 0.88 (P = 0.006). Among the conventional and MPA-related risk factors for mortality, AGR at diagnosis is inversely associated with all-cause mortality during follow-up in MPA patients.

Keywords

Albumin to globulin ratio All-cause mortality Microscopic polyangiitis 

Notes

Funding information

This research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (2017R1D1A1B03029050) and a grant from the Korea Health Technology R&D Project through the Korea Health Industry Development Institute, funded by the Ministry of Health and Welfare, Republic of Korea (HI14C1324).

Compliance with ethical standards

This study was approved by the institutional Review Board (IRB) of Severance Hospital (4-2017-0673), and the patient’s written informed consent was waived by the approving IRB, as this was a retrospective study.

Disclosures

None.

Supplementary material

10067_2018_4292_MOESM1_ESM.docx (15 kb)
Supplementary Table 1 (DOCX 15 kb)
10067_2018_4292_MOESM2_ESM.docx (16 kb)
Supplementary Table 2 (DOCX 16 kb)

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Copyright information

© International League of Associations for Rheumatology (ILAR) 2018

Authors and Affiliations

  1. 1.Division of Rheumatology, Department of Internal MedicineYonsei University College of MedicineSeoulRepublic of Korea
  2. 2.Institute for Immunology and Immunological DiseasesYonsei University College of MedicineSeoulRepublic of Korea

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