title: The relationship between erythropoietin resistance and antibody response to hepatitis B vaccine in hemodialysis patients.
abstract: BACKGROUND
  Seroconversion following Hepatitis B virus (HBV) vaccine in hemodialysis (HD) patients has been shown to be suboptimal. Nutritional and immunological factors were shown to influence the seroconversion related to HBV vaccination in HD patients. Resistance to erythropoiesis stimulating agents (ESA) for correction of anemia has also been shown to be associated with nutrition and inflammation in these patients.
  
  
  OBJECTIVE
  The aim of the current study was to analyze the relationship between anti-HBs response and erythropoietin (EPO) resistance in HD patients.
  
  
  METHODS
  Demographics, clinical characteristics, laboratory parameters and the data about vaccination status were obtained from dialysis charts and vaccination registries retrospectively. To calculate the EPO resistance ESA hypo responsiveness index (EHRI) was used. The EHRI was calculated through deviding the weekly dose of EPO by per kilogram of body weight divided by the hemoglobin level. Patients were divided into non-seroconversion (anti-HBs titers were < 10 IU/L) and seroconversion groups (anti-HBs titers were ≥ 10 IU/L) after completion of the four-dose vaccination schedule.
  
  
  RESULTS
  In total 97 patients were enrolled. For the entire group, stepwise linear regression analysis revealed that square root transformed anti-HBs levels were independently associated with age (P = 0.016), blood urea nitrogen (P = 0.019), high sensitive C-Reactive Protein (P = 0.009), and square root transformed EHRI (P = 0.019). Logistic regression analysis have also demonstrated that blood urea nitrogen (P = 0.002), creatinine (P = 0.046), albumin (P = 0.01) and square root transformed EHRI (P = 0.011) were independently related to seroconversion.
  
  
  CONCLUSIONS
  EPO resistance was negatively associated with anti-HBs levels and seroconversion. More studies are needed to highlight the underlying mechanisms regarding EPO resistance and response to HBV vaccination in HD patients.
authors.affiliation: Department of Medicine, Division of Nephrology, Konya Numune State Hospital, Konya, Turkey.
authors.forename: Baris
authors.initials: B
authors.lastname: Afsar
keywords: Erythropoietin; Hepatitis B; Renal Dialysis; Vaccines