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img  3:  Possible Long-Term Efficacy of Sitagliptin, a Dipeptidyl Peptidase-4 Inhibitor, for Slowly Progressive Type 1 Diabetes (SPIDDM) in the Stage of Non-Insulin-Dependency: An Open-Label Randomized Controlled Pilot Trial (SPAN-S).
 
著者: Takuya Awata, Akira Shimada, Taro Maruyama, Yoichi Oikawa, Nobuyuki Yasukawa, Susumu Kurihara, Yumi Miyashita, Masako Hatano, Yuichi Ikegami, Masafumi Matsuda, Masataka Niwa, Youichiro Kazama, Shoichiro Tanaka, Tetsuro Kobayashi
雑誌名: Diabetes Ther. 2017 Oct;8(5):1123-1134. doi: 10.1007/s13300-017-0299-7. Epub 2017 Sep 19.
Abstract/Text INTRODUCTION: We tested the hypothesis that dipeptidyl peptidase-4 (DPP-4) inhibitors are effective in preserving the β-cell function for long-term periods in patients with slowly progressive type 1 diabetes (SPIDDM) or latent autoimmune diabetes in adults (LADA).
METHODS: In the present open-label, randomized, controlled trial, 14 non-insulin-requiring diabetic patients with glutamic acid decarboxylase autoantibodies (GADAb) were randomly assigned to receive either sitagliptin (S group) or pioglitazone (P group). As a historical control, the Tokyo Study, in which non-insulin-dependent patients with SPIDDM were assigned to receive treatment by either insulin or sulfonylurea (SU), was used.
RESULTS: On average, the ∑C-peptide values during the oral glucose tolerance test through the follow-up periods showed a nonsignificant increase in the S group (n = 6, n = 5 at 48 months) compared to the P group (n = 5, n = 2 at 48 months). In comparison to the data in the Tokyo Study, treatment by sitagliptin significantly influenced the longitudinal changes in the ∑C-peptide values with a more increased direction than insulin or SU, especially in patients with 48 months of follow-up (p = 0.014 and p = 0.007, respectively). Although the titers of GADAb were not significantly different between the S and P groups during the study, the change ratio of the GADAb titers from baseline was significantly inversely correlated with the change ratio of the ∑C-peptide values from baseline in the S group (p = 0.003); in particular, when the GADAb titers decreased from baseline, the ∑C-peptide values frequently increased.
CONCLUSION: The present pilot trial suggests that treatment of SPIDDM/LADA by sitagliptin, a DPP-4 inhibitor, may be more effective in preserving the β-cell function than insulin treatment for at least 4 years, possibly through the immune modulatory effects of DPP-4 inhibitors.
CLINICAL TRIAL REGISTRATION: Japanese Clinical Trials Registry UMIN000003693.

PMID 28929327  Diabetes Ther. 2017 Oct;8(5):1123-1134. doi: 10.1007/s13300-017-0299-7. Epub 2017 Sep 19.
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