title: Tolerability, effectiveness and predictive parameters for the therapeutic usefulness of exenatide in obese, Korean patients with type 2 diabetes.
abstract: OBJECTIVE
  We assessed the tolerability, effectiveness and predictive parameters for the therapeutic usefulness of exenatide in obese Korean participants with type 2 diabetes. We also evaluated the characteristics of participants who respond adequately to glucagon-like peptide-1 (GLP-1) analog therapy in terms of glycated hemoglobin (HbA1c) level reductions and weight loss.
  
  
  METHODS
  This prospective, observational, single-arm (exenatide b.i.d. in combination with both metformin and sulphonylurea), open-label study of GLP-1 analog treatment with close monitoring of metabolic parameters and weight changes was carried out for up to 22 weeks.
  
  
  RESULTS
  Of the 110 enrolled obese participants, 37 participants dropped out during the 22-week treatment period. A total of 73 participants completed the study (median age 55.0 years, interquartile range 44.0-65.0). The median duration of diabetes was 8.0 years (interquartile range 3.5-12.5) with a mean HbA1c value of 7.6% (interquartile range 7.00-8.55). The median body mass index was 30.78 kg/m(2) (interquartile range 27.89-33.92). After 22 weeks, median changes from baseline for HbA1c levels and weight were -0.7% and -3.0 kg, respectively, which were significant. No severe hypoglycemic events were observed. Multivariate regression analysis showed that C-peptide values were a significant independent predictor for a reduction in HbA1c levels (β = 0.865, P = 0.018) with exenatide BID in combination with both sulphonylurea and metformin in obese Korean participants with type 2 diabetes and insulin naïveté.
  
  
  CONCLUSIONS
  Clinical and laboratory parameters, such as insulin naïveté and preserved β-cell function, should be taken into consideration as important factors in the choice of GLP-1 analog when predicting GLP-1 analog responsiveness. This trial was registered with the local committee at Yonsei University in Korea (4-2011-0032).
authors.affiliation: Division of Endocrinology Department of Internal Medicine National Health Insurance Service Ilsan Hospital Seoul Korea ; Department of Medicine Graduate School of Yonsei University Seoul Korea.
authors.forename: Sun Ok
authors.initials: SO
authors.lastname: Song
authors.affiliation: Division of Endocrinology and Metabolism Department of Internal Medicine Severance Hospital Yonsei University College of Medicine Seoul Korea ; Severance Executive Healthcare Clinic Severance Hospital Yonsei University Health System Seoul Korea.
authors.forename: Kwang Joon
authors.initials: KJ
authors.lastname: Kim
authors.affiliation: Division of Endocrinology and Metabolism Department of Internal Medicine Severance Hospital Yonsei University College of Medicine Seoul Korea.
authors.forename: Byung-Wan
authors.initials: BW
authors.lastname: Lee
authors.affiliation: Division of Endocrinology and Metabolism Department of Internal Medicine Severance Hospital Yonsei University College of Medicine Seoul Korea.
authors.forename: Eun Seok
authors.initials: ES
authors.lastname: Kang
authors.affiliation: Division of Endocrinology and Metabolism Department of Internal Medicine Severance Hospital Yonsei University College of Medicine Seoul Korea.
authors.forename: Bong Soo
authors.initials: BS
authors.lastname: Cha
authors.affiliation: Division of Endocrinology and Metabolism Department of Internal Medicine Severance Hospital Yonsei University College of Medicine Seoul Korea.
authors.forename: Hyun Chul
authors.initials: HC
authors.lastname: Lee
keywords: C‐peptide; Exenatide; Type 2 Diabetes