Sensor-Augmented Insulin-Pump Therapy in New-onset Diabetes After Transplantation (SAPT-NODAT)

Treat-To-Target Trial of Continuous Subcutaneous, Sensor-Augmented Insulin-Pump Therapy in New-onset Diabetes After Transplantation (SAPT-NODAT)

The SAPT-NODAT study will test the hypotheses that intensive subcutaneous insulin treatment with short acting insulin, applied continuously through an insulin pump, (i) improves glycemic control, (ii) reduces the prevalence of NODAT and prediabetes, and (iii) offers further β-cell protection, in comparison to the standard of care control group, and the basal insulin treatment group. In the SAPT-NODAT study, we will employ sensor-augmented insulin-pump technology, which performs like a semi-closed loop to prevent hypoglycemic events. Patients in the SAPT-NODAT study will be followed through 24 months post-transplantation.

Study Overview

• Status: Completed
• Conditions: Hyperglycemia
• Intervention / Treatment: Drug: Insulin lispro, Humalog (Eli Lilly) in insulin pump; Drug: Human insulin isophane, Humulin N (Eli Lilly); Other: Standard of care

Detailed Description

Introduction: New-onset diabetes after transplantation (NODAT) is strongly associated with postoperative hyperglycemia, and reduced patient as well as graft survival. In our recent proof-of-concept clinical trial (TIP), we have shown that immediate post-transplant basal insulin therapy decreases hyperglycemia and reduces the prevalence of NODAT by improving pancreatic β-cell function. In consequence, a collaborative multicenter study on NODAT prevention using basal insulin has been approved by the National Institutes of Health (NIH), and will start recruiting 380 patients at 6 international transplant centers, including the Medical University of Vienna and the University of Michigan in 2012. In addition to the NIH-sponsored trial, the Vienna SAPT-NODAT study will test the hypotheses that intensive subcutaneous insulin treatment with short acting insulin, applied continuously through an insulin pump in combination with a glucose sensor (SAPT), (i) improves glycemic control, (ii) reduces the prevalence of NODAT and prediabetes, and (iii) offers further β-cell protection, in comparison to the standard of care control group, and the basal insulin treatment group.

Methods: Combining the NIH-sponsored basal insulin study and the SAPT-NODAT study will yield three study arms, with 28 patients in each arm, namely: [1] the control arm, treated by standard-of-care; [2] the basal insulin arm, treated predominantly with intermediate acting NPH insulin (human insulin isophane, Humulin N, Eli Lilly); [3] the SAPT arm, treated with short acting insulin (Insulin lispro, Humalog, Eli Lilly), applied continuously by SAPT technology. Adult patients with absence of diabetes will be randomized prior to renal transplantation and stratified by deceased donor or living donor, if they are capable of understanding the study and are willing to give informed written consent for all three study arms. Patients will receive standard triple immunosuppressive medications (twice-daily tacrolimus, mycophenolate mofetil or mycophenolic sodium and steroids) with predefined tacrolimus targets and steroid doses. The algorithm for insulin administration is designed to account for the prominent evening peak of hyperglycemia observed in our previous TIP-study. The primary endpoint is HbA1c (in rel.%), at 3 months, and superiority will be assumed if a statistically significant difference between the SAPT-treatment group versus the standard-of-care control group can be determined, by two-sided Student's t-test. Secondary endpoints will be compared between all three groups and will include hypoglycemic events, glycemic variability, 2h glucose ≥200 mg/dL (by oral glucose tolerance test [OGTT] to determine prevalence of diabetes, prediabetes and normal glucose tolerance), beta cell function and insulin sensitivity derived from OGTT, serum creatinine, quality of life measures, patient and graft survival. All secondary endpoint comparisons relying on OGTTs will be made at 6, 12 and 24 months after kidney transplantation, respectively. The result of the 6-months OGTT will be blinded to patients and investigators to prevent subsequent treatment bias.

Discussion: Basal insulin treatment in our previous proof-of-concept study could not prevent a high number of transplant patients exhibiting overt prediabetes (impaired glucose tolerance) at 3, 6 and 12 months, probably on the basis that hyperglycemia was improved, but far from being aggressively treated in patients receiving basal insulin. Prediabetes however is an independent predictor of all-cause mortality in patients after renal transplantation, and therefore not only a harbinger of overt diabetes mellitus but rather a high-risk condition per se. The use of HbA1c as primary endpoint at three months is debatable, but necessary to determine whether SAPT technology may lead to a clinically meaningful improvement of overall glucose control. Specifically, in our previous study (TIP), we observed an intra-individual rise in HbA1c (0.5±0.7 rel.%) from baseline to 3 months, despite basal insulin treatment. If the intra-individual rise in the SAPT arm will remain below that value, SAPT technology could be considered to be a clinically meaningful improvement. The SAPT-NODAT study, besides holding promise to further improve glycemic control, thereby reducing diabetes, prediabetes and possibly cardiovascular events after transplantation, may ensure that the present team of investigators continues to take the lead in post-transplant insulin administration, which is emerging as a central focus in NODAT-prevention and may soon reach broader clinical application.

(Study approval: EK-Nr. 10/2012)

• Study Type: Interventional
• Enrollment (Actual): 85
• Phase: Phase 3

Contacts and Locations

Study Locations

• Austria
  • Vienna, Austria, 1090
    • Medical University of Vienna

Participation Criteria

Eligibility Criteria

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

Description

Inclusion Criteria:

• Adult patients with end stage renal disease undergoing kidney transplantation with a deceased or living donor kidney.
• Absence of diabetes prior to kidney transplantation, defined according to American Diabetes Association guideline (not on oral hypoglycemic agents or insulin with fasting glucose <126 mg/dL).
• Receiving standard triple immunosuppressive medications that include tacrolimus, mycophenolate mofetil or mycophenolic sodium and steroids.
• Capable of understanding the study and willing to give informed written consent for study participation.

Exclusion Criteria:

• Patients with a diagnosis of diabetes mellitus prior to kidney transplantation, or receiving anti-diabetic medications, or having pre-transplant fasting glucose level equal or greater than 126 mg/dL on two occasions at least three days apart.
• Patients receiving an organ transplant other than kidney.
• Patients receiving an unlicensed drug or therapy within one month prior to study entry.
• Patients with history of hypersensitivity to injectable insulin.
• Patients with documented HIV infection.

Study Plan

How is the study designed?

Design Details

• Primary Purpose: Prevention
• Allocation: Randomized
• Interventional Model: Parallel Assignment
• Masking: None (Open Label)

Number of Arms

3

Arms and Interventions

Participant Group / Arm	Intervention / Treatment
Active Comparator: Sensor-augmented Insulin Pump; Continuous subcutaneous sensor-augmented insulin-pump therapy (SAPT) with an insulin pump from Medtronic (Paradigm® Velo) for a period of approximately 3 months post-transplantation.	Drug: Insulin lispro, Humalog (Eli Lilly) in insulin pump; all covered above
Active Comparator: Basal insulin; NPH insulin titration regimen, as specified in the IPT-NODAT study	Drug: Human insulin isophane, Humulin N (Eli Lilly); all covered above
Active Comparator: Standard of care; Patients assigned in this arm will receive standard of care following their kidney transplantation	Other: Standard of care; all covered above; Other Names: Sliding scale short acting insulin for hyperglycemi; Sulphonylurea for NODAT

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Glycosylated hemoglobin (HbA1c)	HbA1c levels, in relative %, at 3 months. Superiority will be assumed if a statistically significant difference between the SAPT-treatment group versus the control group (from the ITP-NODAT study) can be determined.	3 months after transplantation

Secondary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Glycosylated hemoglobin (HbA1c)	HbA1c, in relative %, at 3, 6, 12 and 24 months post-transplantation; The baseline measurement will also be subtracted from the 3-, 6-, 12-, and 24-months measurement (i.e. "3-months, 6-months, 12-months, and 24-months HbA1c minus baseline HbA1c"). For the determination of the intra-individual rise in HbA1c, the previously observed rise of 0.5±0.7 % (mean ± standard deviation) from baseline to 3 months in the TIP-study basal insulin treatment group will be judged to be clinically not meaningful, hence if the intra-individual rise in the SAPT-treatment group remains below that value, the rise in HbA1c will be considered to be not meaningful, clinically.	3, 6, 12, 24 months after transplantation
Oral glucose tolerance test (OGTT)-derived 2 hour-glucose	2h glucose ≥200 mg/dL, as by OGTT at 6, 12 and 24 months after transplantation (in comparison to the simultaneously monitored control group of the ITP-NODAT study [=arm B; control])	6, 12, 24 months after transplantation
Fasting glucose	Fasting glucose and 2h glucose at 6, 12 and 24 months after transplantation.	6, 12, 24 months after transplantation
Beta cell function	Insulinogenic index during an OGTT at 6, 12 and 24 months after kidney transplantation	6, 12, 24 months after transplantation
Insulin sensitivity	Oral glucose insulin sensitivity (OGIS) index at 6, 12 and 24 months after kidney transplantation	6, 12, 24 months after transplantation
Daily glucose measurements	Daily glycemia profile, through evaluation of all available glucose measurements	Daily glucose measurements will be obtained during the hopital stay and while patients are injecting insulin, during an expected average of 3 months.
Serum creatinine	Serum creatinine at 6, 12 and 24 months after kidney transplantation	6, 12 and 24 months after transplantation

Collaborators and Investigators

• Sponsor: Medical University of Vienna

Publications and helpful links

General Publications

• Lo C, Toyama T, Oshima M, Jun M, Chin KL, Hawley CM, Zoungas S. Glucose-lowering agents for treating pre-existing and new-onset diabetes in kidney transplant recipients. Cochrane Database Syst Rev. 2020 Jul 30;8(8):CD009966. doi: 10.1002/14651858.CD009966.pub3.

Study record dates

Study Major Dates

• Study Start: August 1, 2012
• Primary Completion (Actual): May 1, 2018
• Study Completion (Actual): May 1, 2018

Study Registration Dates

• First Submitted: August 30, 2012
• First Submitted That Met QC Criteria: September 6, 2012
• First Posted (Estimate): September 7, 2012

Study Record Updates

• Last Update Posted (Actual): June 6, 2018
• Last Update Submitted That Met QC Criteria: June 5, 2018
• Last Verified: June 1, 2018

More Information

Terms related to this study

• Keywords: Hyperglycemia; Insulin pump; NODAT; Semiclosed loop
• Additional Relevant MeSH Terms: Glucose Metabolism Disorders; Metabolic Diseases; Hyperglycemia; Hypoglycemic Agents; Physiological Effects of Drugs; Insulin; Insulin, Globin Zinc; Insulin Lispro; Insulin, Isophane; Isophane Insulin, Human; Isophane insulin, beef; Insulin, Short-Acting
• Other Study ID Numbers: SAPT-NODAT_9march2012