Efficacy of Automated Insulin Therapy Early Initiated After Diagnosis on Blood Glucose Control in Children and Adolescents With Type 1 Diabetes

Overview

The main objective is to assess whether hybrid closed-loop (HCL) insulin delivery initiated early after diagnosis of Type 1 diabetes (T1D) allows a better efficacy on glucose control than conventional standard insulin therapy with multiple daily insulin injections (MDI) or insulin pumps after one year of use. The secondary objectives are to assess whether HCL initiated early after diagnosis of T1D allows: (1) Higher time spent with glucose level in the near-normal range, (2) Lower time spent in hypoglycemia and hyperglycemia, (3) Lower glucose variability, (4) Lower perceived burden of diabetes management, (5) Better preserved endogenous insulin secretion, all the above after one year of use, (6) Lower occurrence of interventions for hypoglycemia, versus conventional standard insulin therapy with MDI or insulin pump. An optional 1-year extension aims at assessing: (1) Sustainability of above mentioned parameters over a second year of HCL use in the group who started HCL early after diagnosis, (2) Efficacy on glucose control according to the above mentioned parameters when HCL is initiated early after diagnosis vs. after 1 year in the control group of the randomized phase.

This is a prospective, open-label, multicenter, 1-year randomized control trial, followed by an optional 1-year extension. Based upon computed number of needed participants, 112 patients aged 2-17.9 with a diagnosis of T1D within 3-6 months, trained for meal carbohydrate counting (independently or with their parents/guardians) will be enrolled after written informed consent. All participants will be trained to guide their insulin doses from the data of Dexcom G6 CGM system during a 30-day run-in phase. Downloaded CGM data, measured HbA1c and stimulated C-peptide levels and answered study questionnaires at randomization visit will serve as baseline reference. The participants will be randomized 1:1 to either HCL or their usual insulin therapy by MDI or insulin pump (control group). Participants allocated to HCL and their parents/guardians will be trained to the study AID system. Safety phone visits will be scheduled 48 hours, 1 week and 2 weeks after HCL initiation. The participants randomized to the control group will go on using their usual insulin treatment while using the Dexcom G6 data to guide their insulin doses. Outpatient visits will occur every 3 months for one year in both study groups for the monitoring of glucose control (and HCL system functioning if applicable), safety and protocol adherence. At one year, study primary endpoint will be assessed, as well as all secondary study endpoints using a repeated measure ANOVA with within/between factor. After one year, the participants and their parents/guardians of the control group will be offered to switch to HCL with the study system for one year while the initial HCL system group will be offered to keep this therapy for an additional year, with quarterly monitoring visits in the whole population for this optional extension phase of the study. At the end of this extension, all study endpoints will be re-assessed.