Closing the Loop in Adults With Type 1 Diabetes (CLEAR)

An Open-label, Single-centre, Randomised, Two-period, Crossover Study to Assess the Efficacy, Safety and Utility of Closed-loop Glucose Control Compared to Standard Insulin Pump Therapy Combined With Continuous Glucose Monitoring in Adults With Type 1 Diabetes (CLEAR Study)

The main objective of this study is to determine whether home use of fully closed-loop glucose control applying ultra-rapid Lispro insulin is superior to standard insulin pump therapy with continuous glucose monitoring (CGM) in adults with type 1 diabetes on insulin pump therapy with sub-optimal glycaemic control (HbA1c ≥ 8.0%).

This is an open-label, single centre, randomised, crossover design study, involving a run-in period followed by two study periods during which glucose levels will be controlled either by an automated closed-loop system using ultra-rapid Lispro insulin or by participants usual insulin pump therapy with continuous glucose monitoring in random order. A total of up to 30 adults (aiming for 24 completed participants) with T1D on insulin pump therapy will be recruited through diabetes clinics and other established methods. Participants who drop out of the study within the first 4 weeks of the first intervention arm will be replaced.

Participants will receive appropriate training in the safe use of the closed-loop devices. Participants will have access to the study team during the home study phase with 24/7 telephone support.

The primary outcome is time spent in target range between 3.9 and 10.0 mmol/L as recorded by CGM over the 8 week period. Secondary outcomes are HbA1c, time spent with glucose levels above and below target as recorded by CGM, and other CGM-based metrics in addition to insulin requirements. Safety evaluation comprises severe hypoglycaemic episodes, diabetic ketoacidosis (DKA) events and other adverse and serious adverse events.

Study Overview

• Status: Completed
• Conditions: Type 1 Diabetes
• Intervention / Treatment: Device: CamAPS HX; Device: Standard insulin pump therapy with CGM

Detailed Description

Purpose of the clinical trial:

To determine whether home use of fully closed-loop applying ultra-rapid Lispro insulin is superior to insulin pump therapy with continuous glucose monitoring (CGM).

Study objective:

The study objective is to compare home use of fully closed-loop glucose control applying ultra-rapid Lispro insulin with standard insulin pump therapy with CGM.

1. EFFICACY: The objective is to assess the efficacy of fully closed-loop glucose control applying ultra-rapid Lispro insulin in maintaining CGM glucose levels within the target range from 3.9 to 10.0 mmol/l, as compared to standard insulin pump therapy combined with CGM.
2. SAFETY: The objective is to evaluate the safety of fully closed-loop glucose control in terms of episodes of severe hypoglycaemia, hyperglycaemia and other adverse events and adverse device effects.
3. UTILITY: The objective is to determine the percentage of time when closed-loop was operational, and usability and acceptance of the closed-loop system.

Participating clinical centres:

Addenbrooke's Hospital, Cambridge University Hospitals NHS Foundation Trust, Cambridge

Sample Size:

24 adults completing the study. Up to 30 participants will be recruited to allow for dropouts.

Maximum duration of study for a participant:

20 weeks (5 months)

Recruitment The participants will be recruited through the adult diabetes outpatient clinics or other established methods.

Consent:

Participants will be asked to provide written informed consent.

Baseline Assessment:

Eligible participants will undergo a baseline evaluation including a blood sample for the measurement of HbA1c, renal, liver functions, full blood count, thyroid functions and coeliac antibody screen (if not done in the previous 3 months). Urine pregnancy test will be done in females of child bearing age. Human factor questionnaires will be administered.

Run-in Period During the 2-3 week run-in period, participants will use their own insulin pump and wear a masked CGM system. At the end of the run-in period, for compliance, at least 10 days of CGM data need to be recorded. CGM data during the run-in period will be used to assess baseline glucose control before the start of the first home study phase.

Randomisation:

Eligible participants will be randomised using randomisation software to the use of closed-loop glucose control or to standard pump therapy with CGM. There will be no washout period between the two intervention periods.

Automated closed-loop:

Training on the use of closed-loop will be provided by the research team during a 2 to 3 hour session in an outpatient setting (clinical research facility) or may be done remotely. Competency on the use of study insulin pump, study CGM and closed-loop system will be evaluated using a competency assessment tool developed by the research team. Further training may be delivered as required. Participants will be advised to use the closed-loop system with ultra-rapid Lispro insulin for next 8 weeks.

Conventional insulin pump therapy with CGM:

Participants will use their own insulin pump and study CGM. Training on the use of real-time CGM and how to interpret real-time will be provided. Participants will use standard insulin pump therapy, with their usual insulin, and real-time CGM for the next 8 weeks.

Cross-over Assessment:

At the end of the first intervention period, a blood sample for the measurement of HbA1c will be taken and human factor questionnaires will be administered.

End of study assessments:

A blood sample will be taken for measurement of HbA1c and human factor questionnaires will be administered. Study devices will be returned and participants will resume usual care.

Procedures for safety monitoring during trial:

Standard operating procedures for monitoring and reporting of all adverse events and adverse device events will be in place, including serious adverse events (SAE), serious adverse device effects (SADE) and specific adverse events (AE) such as severe hypoglycaemia.

A data monitoring and ethics committee (DMEC) will be informed of all serious adverse events and any unanticipated adverse device/method effects that occur during the study and will review compiled adverse event data at periodic intervals.

Criteria for withdrawal of patients on safety grounds:

A participant may terminate participation in the study at any time without necessarily giving a reason and without any personal disadvantage. An investigator can stop the participation of a subject after consideration of the benefit/risk ratio. Possible reasons are:

• Serious adverse events
• Significant protocol violation or non-compliance
• Failure to satisfy competency assessment
• Decision by the investigator, or the sponsor, that termination is in the participant's best medical interest
• Pregnancy, planned pregnancy, or breast feeding
• Allergic reaction to insulin
• Technical grounds (e.g. participant relocates)

• Study Type: Interventional
• Enrollment (Actual): 26
• Phase: Not Applicable

Contacts and Locations

Study Locations

• United Kingdom
  • Cambridge, United Kingdom, CB2 0QQ
    • Cambridge University Hospitals NHS Foundation Trust

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: 18 years and older (Adult, Older Adult)
• Accepts Healthy Volunteers: No

Description

Inclusion Criteria:

• The participant has type 1 diabetes as defined by WHO for at least 1 year
• The participant is 18 years of age or older
• The participant will have been on an insulin pump for at least 6 months with good knowledge of insulin self-adjustment
• The participant is treated with one of the rapid acting or ultra-rapid acting insulin analogues (Insulin Aspart, faster acting insulin Aspart, Insulin Lispro, ultra-rapid Lispro insulin or Insulin Glulisine)
• HbA1c ≥8.0% (64 mmol/mol) based on analysis from local laboratory
• The participant is willing to wear closed-loop devices
• The participant is willing to follow study specific instructions
• Female participants of child bearing age should using effective contraception and must have a negative urine-HCG pregnancy test at screening.

Exclusion Criteria:

• Any physical or psychological disease or condition likely to interfere with the normal conduct of the study and interpretation of the study results
• Known or suspected allergy against insulin
• Total daily insulin dose > 2 IU/kg/day
• Use of a closed-loop system within the past 30 days
• Participant is pregnant or breast feeding or planning pregnancy within next 12 months
• Severe visual impairment
• Severe hearing impairment
• Lack of reliable telephone facility for contact
• Participant not proficient in English

Study Plan

How is the study designed?

Design Details

• Primary Purpose: Treatment
• Allocation: Randomized
• Interventional Model: Crossover Assignment
• Masking: None (Open Label)

Number of Arms

2

Arms and Interventions

Participant Group / Arm	Intervention / Treatment
Experimental: Fully closed-loop system with ultra-rapid Lispro insulin; The fully closed-loop system (CamAPS HX) will consist of: Dana insulin pump (Diabecare, Sooil, Seoul, South Korea); Dexcom G6 real-time CGM sensor (Dexcom, Northridge, CA, USA); An Android smartphone hosting CamAPS HX app with the Cambridge model predictive control algorithm; Cloud upload system to review CGM/insulin data. Participants will use ultra-rapid Lispro insulin in the closed-loop system	Device: CamAPS HX; Fully automated closed-loop system (CamAPS HX) with ultra-rapid Lispro insulin
Active Comparator: Standard insulin pump therapy with CGM; Participants will use their own insulin pump and usual insulin throughout this study period. The CGM will be the Dexcom G6 real-time CGM sensor (Dexcom, Northridge, CA, USA)	Device: Standard insulin pump therapy with CGM; Participants usual insulin pump therapy with Dexcom G6 CGM

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Time in target glucose range	Time spent in the target glucose range from 3.9 to 10.0 mmol/l (70 to 180mg/dl) based on continuous glucose monitoring (CGM)	8-week home use

Secondary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Time spent above the target glucose range	Time spent above target glucose (10.0 mmol/l) (180 mg/dl) based on CGM	8-week home use
Time spent below the target glucose range	Time spent below target glucose (3.9mmol/l) (70mg/dl) based on CGM	8-week home use
Mean glucose	Average of sensor glucose levels	8-week home use
Standard deviation and coefficient of variation of glucose	Standard deviation and coefficient of variation of CGM glucose levels	8-week home use
HbA1c	Glycated haemoglobin measured at the end of the treatment period	after 8-week home use
Total, basal, and bolus insulin dose	Total, basal, and bolus insulin dose	8-week home use
Time spent in hypoglycaemia	Time with glucose levels < 3.0 mmol/l (54mg/dl) based on CGM	8-week home use
Time spent in hyperglycaemia	Time with glucose levels >13.9 mmol/l (250mg/dl) and > 16.7 mmol/l) (300mg/dl)	8-week home use

Other Outcome Measures

Outcome Measure	Measure Description	Time Frame
Safety evaluation	The number of episodes of hypoglycaemia, DKA and / or significant ketonemia (> 3.0mmol/l) as well as nature and severity of any other adverse events including SADEs and SAEs.	8-week home use
Utility evaluation	Frequency and duration of use of the closed-loop system at home	8-week home use
Human Factor assessment	Expectations, attitudes and responses to the closed-loop system will be assessed using questionnaires. INSPIRE questionnaire PAID questionnaire Hypoglycaemia Confidence Scale	8-week home use

Collaborators and Investigators

• Sponsor: University of Cambridge
• Collaborators: Cambridge University Hospitals NHS Foundation Trust

Study record dates

Study Major Dates

• Study Start (Actual): August 31, 2021
• Primary Completion (Actual): March 31, 2023
• Study Completion (Actual): May 31, 2023

Study Registration Dates

• First Submitted: July 23, 2021
• First Submitted That Met QC Criteria: July 23, 2021
• First Posted (Actual): July 27, 2021

Study Record Updates

• Last Update Posted (Estimated): November 21, 2023
• Last Update Submitted That Met QC Criteria: November 20, 2023
• Last Verified: November 1, 2023

More Information

Terms related to this study

• Additional Relevant MeSH Terms: Glucose Metabolism Disorders; Metabolic Diseases; Immune System Diseases; Autoimmune Diseases; Endocrine System Diseases; Diabetes Mellitus; Diabetes Mellitus, Type 1; Hypoglycemic Agents; Physiological Effects of Drugs; Insulin
• Other Study ID Numbers: 291543

Plan for Individual participant data (IPD)

• Plan to Share Individual Participant Data (IPD)?: YES

IPD Plan Description

Study protocol, statistical analysis plan and fully anonymised individual participant data that underlie the results reported in the manuscript will be available 6 months following publication and ending 36 months following manuscript publication to investigators whose proposed use of the data has been approved by an independent review committee identified for this purpose, to achieve aims in the approved proposal. Proposals should be directed to rh347@cam.ac.uk and may be submitted up to 36 months following article publication. To gain access, data requestors will need to sign a data access agreement.

Fully anonymised data may be shared with third parties (EU or non-EU based) for the purposes of advancing management and treatment of diabetes.

• IPD Sharing Time Frame: Study protocol, statistical analysis plan and fully anonymised individual participant data that underlie the results reported in the manuscript will be available 6 months following publication and ending 36 months following manuscript publication to investigators whose proposed use of the data has been approved by an independent review committee identified for this purpose, to achieve aims in the approved proposal. Proposals should be directed to rh347@cam.ac.uk and may be submitted up to 36 months following article publication.
• IPD Sharing Access Criteria: Study protocol, statistical analysis plan and fully anonymised individual participant data that underlie the results reported in the manuscript will be available 6 months following publication and ending 36 months following manuscript publication to investigators whose proposed use of the data has been approved by an independent review committee identified for this purpose, to achieve aims in the approved proposal. Proposals should be directed to rh347@cam.ac.uk and may be submitted up to 36 months following article publication.
• IPD Sharing Supporting Information Type: STUDY_PROTOCOL; SAP

Drug and device information, study documents

• Studies a U.S. FDA-regulated drug product: No
• Studies a U.S. FDA-regulated device product: No