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Insulin Requirement and Complications Associated With Serum C-Peptide Decline in Patients With Type 1 Diabetes Mellitus During 15 Years After Diagnosis

 Junghwan Suh  ;  Hae In Lee  ;  Myeongseob Lee  ;  Kyungchul Song  ;  Han Saem Choi  ;  Ahreum Kwon  ;  Ho-Seong Kim  ;  Hyun Wook Chae 
 FRONTIERS IN ENDOCRINOLOGY, Vol.13 : 869203, 2022-04 
Journal Title
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Objective: C-peptide is conventionally used in assessing pancreatic function in patients with diabetes mellitus. The clinical significance of this molecule during the course of type 1 diabetes mellitus (T1DM) has been recently revisited. This study aimed to investigate the natural course of C-peptide in T1DM patients over the period of 15 years and analyze the association between the residual C-peptide and diabetes complications.

Methods: This retrospective study included a total of 234 children and adolescents with T1DM. Patient data including sex, age at diagnosis, anthropometric measures, daily insulin dose, serum HbA1c, post-prandial serum C-peptide levels, lipid profiles, and diabetic complications at the time of diagnosis and 1, 3, 5, 10, and 15 years after diagnosis were retrospectively collected.

Results: Among the 234 patients, 101 were men and 133 were women, and the mean patient age at initial diagnosis was 8.3 years. Serum C-peptide decreased constantly since the initial diagnosis, and showed a significant decline at 3 years after diagnosis. At 15 years after diagnosis, only 26.2% of patients had detectable serum C-peptide levels. The subgroup with older patients and patients with higher BMI standard deviation score showed higher mean serum C-peptide, but the group-by-time results were not significant, respectively. Patients with higher serum C-peptide required lower doses of insulin and had fewer events of diabetic ketoacidosis.

Conclusion: Serum C-peptide decreased consistently since diagnosis of T1DM, showing a significant decline after 3 years. Patients with residual C-peptide required a lower dose of insulin and had a lower risk for diabetic ketoacidosis.
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1. College of Medicine (의과대학) > Dept. of Pediatrics (소아과학교실) > 1. Journal Papers
Yonsei Authors
Kwon, Ah Reum(권아름) ORCID logo https://orcid.org/0000-0002-9692-2135
Kim, Ho Seong(김호성) ORCID logo https://orcid.org/0000-0003-1135-099X
Suh, Junghwan(서정환) ORCID logo https://orcid.org/0000-0002-2092-2585
Song, Kyungchul(송경철) ORCID logo https://orcid.org/0000-0002-8497-5934
Lee, Myeongseob(이명섭)
Chae, Hyun Wook(채현욱) ORCID logo https://orcid.org/0000-0001-5016-8539
Choi, Han Saem(최한샘) ORCID logo https://orcid.org/0000-0003-4140-0345
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