Autologous Immunoregulatory Dendritic Cells for Type 1 Diabetes Therapy
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|ClinicalTrials.gov Identifier: NCT02354911|
Recruitment Status : Unknown
Verified January 2015 by DiaVacs, Inc..
Recruitment status was: Not yet recruiting
First Posted : February 3, 2015
Last Update Posted : February 4, 2015
|Condition or disease||Intervention/treatment||Phase|
|Type 1 Diabetes||Biological: Immunoregulatory Dendritic Cells Other: Placebo Comparator: Placebo Control||Phase 2|
This is a double-blind, placebo-controlled cross study designed to evaluate the safety and efficacy of autologous immunoregulatory dendritic cells (iDC) in patients with type 1 diabetes. To do this, a total of 24 subjects with recent onset (<100 days from diagnosis) type 1 diabetes will have circulating dendritic cells harvested via leukapheresis. The harvested dendritic cells will then be incubated in vitro with antisense DNA oligonucleotides targeting the primary transcripts of cluster of differentiation antigen 40 (CD40), cluster of differentiation antigen 80 (CD80) and cluster of differentiation antigen 86 (CD86). These engineered dendritic cells will then be given as autologous intradermal injections (4 injections administered at 2 week intervals) in the subject' peri-umbilical region. The hypothesis is that the injected cells will generate immunoregulatory cells that suppress the autoimmune process responsible for the development of type 1 diabetes via destruction of the subject's pancreatic beta cells.
Employing a cross-over design, all subjects will undergo leukapheresis at the outset. Twelve subjects will be randomly assigned to receive cell injections at the outset while the other 12 subjects will receive sham injections and serve as controls. At the end of 12 months, all subjects will cross-over to the alternative treatment and continue to be followed for an additional 12 months. (Note: The subjects assigned to receive the cell therapy for this segment will receive injections of their autologous cells harvested and engineered at the time of the leukapheresis performed at study entry. The engineered cells will be stored frozen until needed for administration. This design will test whether treatment later (>1 year after diagnosis) is as effective as immediate treatment (<100 days from the diagnosis of type 1 diabetes).
As an added safety measure, the first 6 subjects randomized will all be over the age of 18. When the last of these 6 subjects complete 3 months of observation following the initiation of therapy, the age for enrollment will be lowered to age 16 for the next 6 subjects unless safety observations dictate otherwise. When all subjects in this cohort have been enrolled, the age for enrollment will be lowered to age 14 unless advised otherwise by the independent Data Safety Monitoring Board. When all subjects in this cohort have completed observation for 3 months, the age for enrollment will be lowered to age 12 following clearance by the Data Safety Monitoring Board.
If this therapy is successful, the subjects' remaining beta cell mass will be preserved and hopefully expanded once the autoimmune process is slowed or stopped. This outcome will be assessed indirectly using plasma c-peptide concentrations following ingestion of a standardized mixed meal at the end of 12 and 24 months of therapy. If the treatment is successful, glucose control should improve and be detectable via measurement of hemoglobin A1c (measure of long-term control), fasting plasma glucose concentrations and the plasma glucose concentrations following ingestion of the standardized mixed meal. In addition, the total daily insulin requirements should decrease. These measures of glucose control will be assessed at baseline and then at 3, 6, 9, 12, 15, 18, 21 and 24 months.
Immune markers will also be profiled at 3 month intervals to assess potential tolerogenic effects of the therapy. To this end, numbers of potentially tolerogenic/regulatory T-cells, B-cells and dendritic cells in the circulating peripheral blood monocyte population will be assessed. In addition, analysis of selected populations of T-cells, B-cells and dendritic cells will be conducted over the entire study period in an attempt to identify molecular signatures correlated with the clinical response.
Finally, in addition to the routine safety laboratory measurements, all reported adverse events will be examined in detail to characterize the safety aspects of the therapy. The review of these safety data will be guided by an independent Data Safety Monitoring Board which will meet at least semi-annually to review the accrued data.
|Study Type :||Interventional (Clinical Trial)|
|Estimated Enrollment :||24 participants|
|Intervention Model:||Crossover Assignment|
|Masking:||Quadruple (Participant, Care Provider, Investigator, Outcomes Assessor)|
|Official Title:||A Randomized, Double-Blind, Placebo-Controlled, Cross-Over Study of the Safety and Efficacy of Autologous Immunoregulatory Dendritic Cells in Patients With Type 1 Diabetes|
|Study Start Date :||October 2015|
|Estimated Primary Completion Date :||July 2018|
|Estimated Study Completion Date :||January 2019|
Experimental: Immunoregulatory Dendritic Cells (iDC)
Biological intervention consisting of autologous dendritic cells treated in vitro to convert to active immunoregulatory dendritic cells.
Biological: Immunoregulatory Dendritic Cells
Autologous dendritic cells harvested by leukapheresis and engineered ex vivo via incubation with antisense DNA oligonucleotides targeting the primary transcripts of CD40, CD80 and CD86. The ex vivo engineered product is then administered via blinded intradermal injection in the peri-umbilical region of the abdomen given as 4 separate injections at 2-week intervals (~10 million cells/injection).
Other Name: iDC
Placebo Comparator: Placebo Control
Saline injections administered blinded to subject and all study staff except for research pharmacist who is not involved in study conduct
Other: Placebo Comparator: Placebo Control
Blinded intradermal injections in the peri-umbical region of the abdomen given as 4 separate injections at 2-week intervals
- Change from baseline in the mean 2-hour area under the curve (AUC) for plasma c-peptide at 12 and 24 months [ Time Frame: 12 and 24 months ]Mean 2-hour area under the time-concentration curve for plasma c-peptide following ingestion of a standardized mixed meal compared across treatment groups at end of Segment 1 (12 months) and Segment 2 (24 months)
- Reported adverse events [ Time Frame: 12 months; 12 to 24 months and 0 to 24 months ]All reported adverse events for treatment compared to placebo control group across each treatment period
- Change from baseline in number of potentially-tolerogenic/regulatory T-cells, B-cells and dendritic cells in circulating peripheral blood mononuclear cell fraction [ Time Frame: 3,6,9,12,15,18,21 and 24 months ]Numbers of potentially-tolerogenic/regulatory T-cells, B-cells and dendritic cells in circulating peripheral blood mononuclear cell fraction assessed at 3 month intervals over the course of both treatment periods based on defined cell markers
- Change from baseline in sub-populations of T-cells [ Time Frame: 3,6,9,12,15,18,21 and 24 months ]Sub-populations of T-cells in iDC treatment group compared to placebo group assessed at 3 month intervals throughout the course of both segments of the trial
- Change from baseline in sub-populations of B-cells [ Time Frame: 3,6,9,12,15,18,21 and 24 months ]Sub-populations of B-cells in iDC treatment group compared to placebo group assessed at 3 month intervals throughout the course of both segments of the trial
- Change from baseline in sub-populations of dendritic cells [ Time Frame: 3,6,9,12,15,18,21 and 24 months ]Sub-populations of dendritic cells in iDC treatment group compared to placebo group assessed at 3 month intervals throughout the course of both segments of the trial
- Change from baseline in Fasting Plasma Glucose [ Time Frame: 3, 6, 9, 12,15,18,21, and 24 months ]Plasma glucose concentration following an overnight fast of at least 8 hours duration
- Change from baseline in Hemoglobin A1c [ Time Frame: 3, 6, 9, 12,15,18,21, and 24 months ]Measurement of hemoglobin A1c is the well-established measure of glucose control reflecting the "integrated" glycemic exposure over the past 90 to 120 days
- Change from baseline in the baseline corrected, 2-hour AUC for glucose at 12 and 24 months [ Time Frame: 12 and 24 months ]Baseline corrected, 2-hour AUC for plasma glucose following ingestion of a standardized mixed meal
- Change from baseline in Total Daily Insulin Dose [ Time Frame: 3, 6, 9, 12,15,18,21, and 24 months ]The cumulative total daily insulin dose collected as the average for the 3-day period immediately prior to the respective clinic visits. This includes all forms of insulin used by the subject
To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.
Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT02354911
|Contact: Orville G Kolterman, MDemail@example.com|
|Study Chair:||Massimo Trucco, PhD||Institue of Cellular Therapeutics, Allegheny General Hospital, Pittsburgh, PA|