GIP/GLP-1RA as Adjunctive to Automated Insulin Delivery in Adults With Type 1 Diabetes

Phase 3

Not yet recruiting

• Conditions: Type 1 Diabetes (T1D)
• Interventions: Drug: Tirzepatide

• Registration Number: NCT06630585
• Lead Sponsor: University of Bern

Brief Summary

Blood glucose management in type 1 diabetes (T1D) remains a challenge, with only \~30% of adults within the recommended consensus guidelines. Novel drugs like glucagon-like peptide-1 receptor agonists (GLP-1RAs) and glucose-dependent insulinotropic polypeptide (GIP)/GLP-1RAs have emerged as promising add-ons to insulin in T1D.

This application has been designed to test in a prospective study whether adding a new medicine called tirzepatide (GIP/GLP-1RA) to the usual insulin therapy would make a difference for people with T1D in terms of better glucose control.

Detailed Description

Glycemic control in type 1 diabetes (T1D) remains a challenge, with \~30% of adults achieving an A1c target of 7%. The glucagon-like peptide-1 receptor agonists (GLP-1RAs) and glucose-dependent insulinotropic polypeptide (GIP)/GLP-1RAs have emerged as a promising therapy in T1D. Retrospective studies have shown patients with T1D can significantly improve glycemic control with a reduction in insulin dose and body weight when long-acting GLP-1RAs or GIP/GLP-1RAs are added to insulin therapy. However, randomized controlled trials (RCT) are still lacking.

This is a prospective, randomized, open-label design. The investigators will enroll 42 participants over 18 years of age with confirmed T1D diagnosis ≥6 months, currently on automatic insulin delivery (AID) therapy for at least three months, with A1C ≥6.5% and ≤10%and BMI ≥23 kg/m2. Participants will be randomized in a 1:1 ratio to either tirzepatide 5.0 mg or continue with the Standard of Care (SoC) for 12 weeks (after a titration phase with the lowest dose of 2.5 mg). The primary endpoint is continuous glucose monitoring (CGM) percent time spent between 3.9 and 10.0 mmol/L (TIR) from baseline to follow-up after 12 weeks of treatment. Secondary endpoints include the change in 24/7 CGM percent time \>10.0 mmol/L, 24/7 CGM percent time \>13.9 mmol/L, 24/7 CGM percent time \<3.9 mmol/L, 24/7 CGM percent time \<3.0 mmol/L and the change in body mass index (BMI).

This is the first prospective study to investigate the efficacy and safety of tirzepatide (GIP/GLP1-RAs) as an adjuvant therapy to AID. This study may contribute unique data to significantly improving glucose outcomes, reducing the T1D burden, improving the quality of life, and re-directing attention to further treatment in T1D beyond insulin therapies.

Study Timeline

• Status Verified: 2024-10
• Study First Submitted: 2024-10-03
• Study First Submitted QC: 2024-10-03
• Study First Posted: 2024-10-08
• Last Update Submitted: 2024-10-16
• Last Update Posted: 2024-10-18
• Study Start: 2024-11
• Primary Completion: 2025-12
• Study Completion: 2025-12

Recruitment & Eligibility

• Status: NOT_YET_RECRUITING
• Sex: All
• Target Recruitment: 42

Inclusion Criteria

1. Participants with diagnosed T1D for at least 12 months.
2. Aged between 18 to 65 years old (inclusive).
3. Currently on AID therapy for at least three months.
4. HbA1C higher or equal to 6.5% and less or equal to 10%.
5. BMI ≥23 kg/m2.
6. Willing to use once-weekly tirzepatide for at least 16 weeks (including four weeks of up-titration and 12 weeks of treatment)
7. Willing to wear a Dexcom G7 Sensor and share devices (AID) data uploads.
8. Willingness not to start any new non-insulin glucose-lowering agent during the trial (including metformin/biguanides, pramlintide, DPP-4 inhibitors, sodium-glucose cotransporter 2 inhibitors [SGLT2 inhibitors], and nutraceuticals).
9. A stable weight (± 5%) in the last 90 days or more before the screening and agree to not initiate a diet and/or exercise program during the study to reduce body weight other than the lifestyle and dietary measures for diabetes treatment.
10. Females with childbearing potential and males (if apply) must be willing to use reliable contraceptive methods (for the contraceptives study guidelines. See Annex 7 of the protocol)
11. An understanding and willingness to follow the protocol and signed informed consent.

Exclusion Criteria

1. History of diabetic ketoacidosis requiring hospitalization in the past six months.
2. History of severe hypoglycemic event (Level 3, defined as seizure or loss of consciousness) in the past six months.
3. Uncontrolled Diabetic retinopathy or maculopathy
4. Severe gastroparesis.
5. Less than 12 months of insulin treatment.
6. Estimated glomerular filtration rate (eGFR) lab value below 30 mL/min/1.73 m2 by the CKD-EPI formula(99).
7. Pregnancy or intention to become pregnant during the trial (See annex 7).
8. Currently breastfeeding or planning to breastfeed.
9. Currently uncontrolled seizure disorder.
10. History of allergy to GIP/GLP-1RAs or its excipients.
11. Personal or family history of multiple endocrine neoplasia type 2 (MEN-2) or medullary thyroid carcinoma.
12. Screening calcitonin above or equal to 35 ng/L.
13. Planned any surgery during the study duration.
14. Have uncontrolled hypertension (systolic BP above or equal to 160 mmHg and/or diastolic BP above or equal to 100 mmHg). If a participant is on anti-hypertensive therapies, doses must be stable for 30 days before screening. For participants with uncontrolled hypertension at the screening visit, antihypertensive medication may be started or adjusted.
15. Personal history of one of the following cardiovascular conditions (within two months before the screening): acute myocardial infarction, cerebrovascular accident (stroke), unstable angina, or hospitalization due to congestive heart failure (CHF).
16. Conditions that may increase the risk of induced hypoglycemia, such as CHF with NYHA Functional Classification III or IV or adrenal insufficiency.
17. Have a history of documented human immunodeficiency virus (HIV) infection.
18. Have an uncontrolled cardiac arrhythmia based on an electrocardiogram (ECG) at the screening time and the investigator's discretion.
19. Cystic fibrosis.
20. Patient with a history of gastric bypass (bariatric) surgery, sleeve gastrectomy, or restrictive bariatric surgery, such as Lap-Band® or gastric banding.
21. Uncontrolled thyroid disease as judged by the investigator
22. Serum triglycerides higher than 5.7 mmol/L (500 mg/dL) at the screening. If a participant is on lipid-lowering therapies, doses must be stable for 30 days before screening.
23. Personal history of acute or chronic pancreatitis. A participant with a history of acute pancreatitis caused by gallstones may be included in the study if the participant has had a cholecystectomy to resolve the problem.
24. Acute or chronic hepatitis other than MASLD.
25. Have a history of symptomatic gallbladder disease within the past two years (unless the participant has had a cholecystectomy to resolve the problem).
26. History of malignancy requiring chemotherapy, surgery, or radiation (other than basal or squamous cell skin cancer, in situ carcinomas of the cervix, or in situ prostate cancer) in the previous five years.
27. Active or unstable major depressive disorder (MDD) or other severe psychiatric disorder (such as known drug or alcohol abuse, diagnosed eating disorder, or any other uncontrolled psychiatric disorder) that, in the investigator's opinion, may preclude the participant from following and completing the protocol.
28. Treatment with non-insulin glucose-lowering agents other than metformin (on a stable dose 30 days before the study)
29. Weight loss medications in the past three months.
30. Participants who are anticipated to receive, are receiving, or have received within three months before the screening (more than two weeks and more or equal to 10mg prednisolone-equivalent) chronic systemic glucocorticoid therapy (excluding topical, intraocular, intranasal, single intraarticular injection, or inhaled preparations).
31. Have current treatment with (or history of, within three months before screening) medications that may significantly affect glucose metabolism.
32. Use of investigational drugs within five half-lives before screening.
33. Participation in another study with an investigational drug within the 30 days preceding and during the present study.
34. Current enrollment in another clinical trial unless approved by the investigator of both studies and if the clinical trial is a non-interventional registry trial.
35. Have evidence of a significant active, uncontrolled medical condition or a history of any medical problem capable of constituting a risk when using the study devices or interfering with following study procedures or the interpretation of data, as judged by the study physician at screening.
36. The enrolment of the investigator, his/her family members, employees, and other dependent persons.

Study & Design

• Study Type: INTERVENTIONAL
• Study Design: PARALLEL

Arm && Interventions

Group	Intervention	Description
Standard of Care + Drug	Tirzepatide	Participants in this arm will use their standard of care (SoC) plus tirzepatide (titrated to reach a minimum accepted dose.

Primary Outcome Measures

Name	Time	Method
Change TIR	From up-titration (week 4) to the end of the observation period (week 16) for a total of 12 weeks.	Mean difference (change) from baseline and after 12 weeks of treatment in 24/7 CGM percent time spent between 3.9 and 10 mmol/L (TIR) comparing tirzepatide+SoC (intervention) vs. SoC (control).

Secondary Outcome Measures

Name	Time	Method
Change LBGI 8w	From up-titration (week 4) to week 12	Mean difference (change) from baseline and after 8 weeks of treatment in low blood glucose index (LBGI) comparing tirzepatide+SoC (intervention) vs. SoC (control).
Change HBGI 8w	From up-titration (week 4) to week 12	Mean difference (change) from baseline and after 8 weeks of treatment in high blood glucose index (HBGI) comparing tirzepatide+SoC (intervention) vs. SoC (control).
Change TDI 8w	From up-titration (week 4) to week 12	Mean difference (change) from baseline and after 8 weeks of treatment in high total daily insulin (TDI) comparing tirzepatide+SoC (intervention) vs. SoC (control).
Change TDBa 8w	From up-titration (week 4) to week 12	Mean difference (change) from baseline and after 8 weeks of treatment in total daily basal (TDBa) comparing tirzepatide+SoC (intervention) vs. SoC (control).
Change TDBo 8w	From up-titration (week 4) to week 12	Mean difference (change) from baseline and after 8 weeks of treatment in total daily bolus (TDBo) comparing tirzepatide+SoC (intervention) vs. SoC (control).
Change TAR 8w	From up-titration (week 4) to week 12	Mean difference (change) from baseline and after 8 weeks of treatment in 24/7 CGM percent time higher than 10 mmol/L (TAR) comparing tirzepatide+SoC (intervention) vs. SoC (control).
Change TAR Level 2 w8	From up-titration (week 4) to week 12	Mean difference (change) from baseline and after 8 weeks of treatment in 24/7 CGM percent time higher than 13.9 mmol/L (TAR level 2) comparing tirzepatide+SoC (intervention) vs. SoC (control).
Change TBR 8w	From up-titration (week 4) to week 12	Mean difference (change) from baseline and after 8 weeks of treatment in 24/7 CGM percent time lower than 3.9 mmol/L (TBR) comparing tirzepatide+SoC (intervention) vs. SoC (control).
Change TBR Level 2 w8	From up-titration (week 4) to week 12	Mean difference (change) from baseline and after 8 weeks of treatment in 24/7 CGM percent time lower than 3.0 mmol/L (TBR level 2) comparing tirzepatide+SoC (intervention) vs. SoC (control).
Change TIR daytime	From up-titration (week 4) to the end of the observation period (week 16) for a total of 12 weeks.	Mean difference (change) from baseline and after 12 weeks of treatment in the daytime (7-23h) CGM percent time spent between 3.9 and 10 mmol/L (TIR) comparing tirzepatide+SoC (intervention) vs. SoC (control).
Change TTR	From up-titration (week 4) to the end of the observation period (week 16) for a total of 12 weeks.	Mean difference (change) from baseline and after 12 weeks of treatment in 24/7 CGM percent time spent between 3.9 and 7.8 mmol/L (TTR) comparing tirzepatide+SoC (intervention) vs. SoC (control).
Change mean glucose	From up-titration (week 4) to the end of the observation period (week 16) for a total of 12 weeks.	Mean difference (change) from baseline and after 12 weeks of treatment in 24/7 in mean glucose comparing tirzepatide+SoC (intervention) vs. SoC (control).
Change CV	From up-titration (week 4) to the end of the observation period (week 16) for a total of 12 weeks.	Mean difference (change) from baseline and after 12 weeks of treatment in 24/7 in the coefficient of variation (CV) comparing tirzepatide+SoC (intervention) vs. SoC (control).
Change Glucose SD	From up-titration (week 4) to the end of the observation period (week 16) for a total of 12 weeks.	Mean difference (change) from baseline and after 12 weeks of treatment in 24/7 in the standard deviation of glucose comparing tirzepatide+SoC (intervention) vs. SoC (control).
Change LBGI	From up-titration (week 4) to the end of the observation period (week 16) for a total of 12 weeks.	Mean difference (change) from baseline and after 12 weeks of treatment in low blood glucose index (LBGI) comparing tirzepatide+SoC (intervention) vs. SoC (control).
Change HBGI	From up-titration (week 4) to the end of the observation period (week 16) for a total of 12 weeks.	Mean difference (change) from baseline and after 12 weeks of treatment in high blood glucose index (HBGI) comparing tirzepatide+SoC (intervention) vs. SoC (control).
Change TDI	From up-titration (week 4) to the end of the observation period (week 16) for a total of 12 weeks.	Mean difference (change) from baseline and after 12 weeks of treatment in high total daily insulin (TDI) comparing tirzepatide+SoC (intervention) vs. SoC (control).
Change TDBa	From up-titration (week 4) to the end of the observation period (week 16) for a total of 12 weeks.	Mean difference (change) from baseline and after 12 weeks of treatment in total daily basal (TDBa) comparing tirzepatide+SoC (intervention) vs. SoC (control).
Change TDBo	From up-titration (week 4) to the end of the observation period (week 16) for a total of 12 weeks.	Mean difference (change) from baseline and after 12 weeks of treatment in total daily bolus (TDBo) comparing tirzepatide+SoC (intervention) vs. SoC (control).
Change Glycated Hemoglobin (HbA1C)	At the end of the observation period (week 16)	Mean difference (change) from baseline and after 12 weeks of treatment in glycated hemoglobin (HbA1C) comparing tirzepatide+SoC (intervention) vs. SoC (control).
Change BW	At the end of the observation period (week 16)	Mean difference (change) from baseline and after 12 weeks of treatment in body weight (BW) comparing tirzepatide+SoC (intervention) vs. SoC (control).
Change DTSQ	At the end of the observation period (week 16)	Mean difference (change) from baseline and after 12 weeks of treatment in Patient-reported outcomes: DTSQc (baseline)/DTSQc (last visit-end of treatment) comparing tirzepatide+SoC (intervention) vs. SoC (control).
Change TIR 4w	From up-titration (week 4) to week 8	Mean difference (change) from baseline and after 4 weeks of treatment in 24/7 CGM percent time spent between 3.9 and 10 mmol/L (TIR) comparing tirzepatide+SoC (intervention) vs. SoC (control).
Change TIR daytime 4w	From up-titration (week 4) to week 8	Mean difference (change) from baseline and after 4 weeks of treatment in the daytime (7-23h) CGM percent time spent between 3.9 and 10 mmol/L (TIR) comparing tirzepatide+SoC (intervention) vs. SoC (control).
Change TTR 4w	From up-titration (week 4) to week 8	Mean difference (change) from baseline and after 4 weeks of treatment in 24/7 CGM percent time spent between 3.9 and 7.8 mmol/L (TTR) comparing tirzepatide+SoC (intervention) vs. SoC (control).
Change TAR 4w	From up-titration (week 4) to week 8	Mean difference (change) from baseline and after 4 weeks of treatment in 24/7 CGM percent time spent higher than 10 mmol/L (TAR) comparing tirzepatide+SoC (intervention) vs. SoC (control).
Change TAR	From up-titration (week 4) to the end of the observation period (week 16) for a total of 12 weeks.	Mean difference (change) from baseline and after 12 weeks of treatment in 24/7 CGM percent time higher than 10 mmol/L (TAR) comparing tirzepatide+SoC (intervention) vs. SoC (control).
Change TAR Level 2	From up-titration (week 4) to the end of the observation period (week 16) for a total of 12 weeks.	Mean difference (change) from baseline and after 12 weeks of treatment in 24/7 CGM percent time higher than 13.9 mmol/L (TAR level 2) comparing tirzepatide+SoC (intervention) vs. SoC (control).
Change TAR Level 2 4w	From up-titration (week 4) to week 8	Mean difference (change) from baseline and after 4 weeks of treatment in 24/7 CGM percent time higher than 13.9 mmol/L (TAR level 2) comparing tirzepatide+SoC (intervention) vs. SoC (control).
Change TBR	From up-titration (week 4) to the end of the observation period (week 16) for a total of 12 weeks.	Mean difference (change) from baseline and after 12 weeks of treatment in 24/7 CGM percent time lower than 3.9 mmol/L (TBR) comparing tirzepatide+SoC (intervention) vs. SoC (control).
Change TBR 4w	From up-titration (week 4) to week 8	Mean difference (change) from baseline and after 4 weeks of treatment in 24/7 CGM percent time lower than 3.9 mmol/L (TBR) comparing tirzepatide+SoC (intervention) vs. SoC (control).
Change TBR Level 2	From up-titration (week 4) to the end of the observation period (week 16) for a total of 12 weeks.	Mean difference (change) from baseline and after 12 weeks of treatment in 24/7 CGM percent time lower than 3.0 mmol/L (TBR level 2) comparing tirzepatide+SoC (intervention) vs. SoC (control).
Change TBR Level 2 w4	From up-titration (week 4) to week 8	Mean difference (change) from baseline and after 4 weeks of treatment in 24/7 CGM percent time lower than 3.0 mmol/L (TBR level 2) comparing tirzepatide+SoC (intervention) vs. SoC (control).
Change mean glucose 4w	From up-titration (week 4) to the end of the observation period (week 16) for a total of 12 weeks.	Mean difference (change) from baseline and after 4 weeks of treatment in 24/7 in mean glucose comparing tirzepatide+SoC (intervention) vs. SoC (control).
Change CV 4w	From up-titration (week 4) to the end of the observation period (week 16) for a total of 12 weeks.	Mean difference (change) from baseline and after 4 weeks of treatment in 24/7 in the coefficient of variation (CV) comparing tirzepatide+SoC (intervention) vs. SoC (control).
Change Glucose SD 4w	From up-titration (week 4) to week 8	Mean difference (change) from baseline and after 4 weeks of treatment in 24/7 in the standard deviation of glucose comparing tirzepatide+SoC (intervention) vs. SoC (control).
Change LBGI 4w	From up-titration (week 4) to week 8	Mean difference (change) from baseline and after 4 weeks of treatment in low blood glucose index (LBGI) comparing tirzepatide+SoC (intervention) vs. SoC (control).
Change HBGI 4w	From up-titration (week 4) to week 8	Mean difference (change) from baseline and after 4 weeks of treatment in high blood glucose index (HBGI) comparing tirzepatide+SoC (intervention) vs. SoC (control).
Change TDI 4w	From up-titration (week 4) to week 8	Mean difference (change) from baseline and after 4 weeks of treatment in high total daily insulin (TDI) comparing tirzepatide+SoC (intervention) vs. SoC (control).
Change TDBa 4w	From up-titration (week 4) to week 8	Mean difference (change) from baseline and after 4 weeks of treatment in total daily basal (TDBa) comparing tirzepatide+SoC (intervention) vs. SoC (control).
Change TDBo 4w	From up-titration (week 4) to week 8	Mean difference (change) from baseline and after 4 weeks of treatment in total daily bolus (TDBo) comparing tirzepatide+SoC (intervention) vs. SoC (control).
Change TIR 8w	From up-titration (week 4) to week 12	Mean difference (change) from baseline and after 8 weeks of treatment in 24/7 CGM percent time spent between 3.9 and 10 mmol/L (TIR) comparing tirzepatide+SoC (intervention) vs. SoC (control).
Change TIR daytime 8w	From up-titration (week 4) to week 12	Mean difference (change) from baseline and after 8 weeks of treatment in the daytime (7-23h) CGM percent time spent between 3.9 and 10 mmol/L (TIR) comparing tirzepatide+SoC (intervention) vs. SoC (control).
Change TTR 8w	From up-titration (week 4) to week 12	Mean difference (change) from baseline and after 8 weeks of treatment in 24/7 CGM percent time spent between 3.9 and 7.8 mmol/L (TTR) comparing tirzepatide+SoC (intervention) vs. SoC (control).
Change mean glucose 8w	From up-titration (week 4) to week 12	Mean difference (change) from baseline and after 8 weeks of treatment in 24/7 in mean glucose comparing tirzepatide+SoC (intervention) vs. SoC (control).
Change CV 8w	From up-titration (week 4) to week 12	Mean difference (change) from baseline and after 8 weeks of treatment in 24/7 in the coefficient of variation (CV) comparing tirzepatide+SoC (intervention) vs. SoC (control).
Change Glucose SD 8w	From up-titration (week 4) to week 12	Mean difference (change) from baseline and after 8 weeks of treatment in 24/7 in the standard deviation of glucose comparing tirzepatide+SoC (intervention) vs. SoC (control).

Trial Locations

Locations (1)

Kantonsspital Olten; 🇨🇭 Olten, Solothurn, Switzerland