Autologous Ex Vivo Expanded Regulatory T Cells in Ulcerative Colitis

October 16, 2023 updated by: University of Erlangen-Nürnberg Medical School

Phase I, Open-label, Fast-track Dose-escalation Clinical Trial Exploring the Safety and the Tolerability of Autologous ex Vivo Expanded Regulatory T Cells in Adults With Ulcerative Colitis

Together with Crohn's disease (CD), ulcerative colitis (UC) is one of the major forms of inflammatory bowel diseases (IBD).Currently, no curative therapy is available, since the pathophysiology of this disease is incompletely understood (1-3) and clinical practice demonstrates that current therapies induce remission in subgroups of patients only. Scientific evidence suggests that colitogenic immune responses can be controlled by increasing the number of circulating regulatory T cells (Treg) (4). The production of large numbers of autologous Treg is possible by isolation of CD25+ cells from the whole blood of a patient and subsequent ex vivo expansion in the presence of the immunomodulatory drug rapamycin, Interleukin-2 (IL-2) and CD3/CD28 expander beads (5).

ER-TREG 01 is a single-center, open-label, fast-track phase I dose-escalation study designed to assess the safety profile and maximal tolerated dose (MTD) of a single infusion of ex vivo expanded autologous Treg in patients with active ulcerative colitis.

Study Overview

Status

Completed

Conditions

Intervention / Treatment

Detailed Description

While the primary cause of inflammatory bowel disease (IBD) development remains unknown, it is widely accepted that the initial events culminate in persistent immune responses with infiltration of immune cells and tissue destruction in the gut. Immune cell populations present within the inflamed bowel wall of IBD patients have been extensively characterized and studied (1;6). Studies focusing on T cells have demonstrated that the mucosa of Crohn's disease (CD) patients is dominated by Th1 cells, while in patients with ulcerative colitis (UC) T helper cells with an atypical Th2 profile, which excessively produce IL-5 and IL-13 but not IL-4, are abundant (7). Furthermore, Th17 cells can be identified in the inflamed lamina propria and these cells are thought to play an important role in the pathophysiology of IBD, although the pathogenic mechanisms of these cells are not yet fully understood (8;9). Treg are also present within the lamina propria and these cells control the effector T cell populations mentioned above. They can be generated through the interaction of local T cells with CD103 expressing dendritic cells and intestinal epithelial cells, respectively (10;11). Moreover, the expression of integrins on the Treg surface (e.g. α4β7) facilitates mucosal migration through their interaction with specific ligands (e.g. MAdCAM1). As such, homing and local expansion of Treg cells create a local Treg pool that is essential for self-tolerance and the support of gut homeostasis (12). In addition, Treg cells are shown to suppress proinflammatory intestinal immune responses in colitis and colitis-associated cancer (13-16) and they are thought to augment intestinal Th17 responses (17). As previous studies have demonstrated insufficient expansion of mucosal Treg cells in IBD patients in comparison to the massive local expansion of effector T cells, it is likely that the relatively low number of Treg cells in IBD patients explains why these cells fail to control excessive immune responses (18).

Experimental colitis studies in mice have demonstrated that colitogenic immune responses can be controlled by increasing the number of mucosal Treg cells and highlight the potential of Treg-based cell therapy in IBD (19). Specifically, co-transfer of naïve CD4+ T cells with Treg both prevents chronic colitis and ameliorates established colitis in severe combined immunodeficiency (SCID) mice (20). Moreover, CD4+ T cells expanded ex vivo in the presence of rapamycin prevent the development of colitis in a naïve CD4+ T cell model in SCID mice. Importantly, the systemic administration of rapamycin alone only partially prevented the development of colonic Inflammation (20). In addition, the adoptive transfer of nTreg cells as well as the adoptive transfer of ex vivo transforming growth factor (TGF)-β-induced Treg (iTreg) suppressed colitis activity in vivo in mouse models (13;15;21). Collectively, these data suggest that Treg cells could be used for therapy of intestinal inflammation in IBD (22).

To allow an adoptive transfer of large numbers of Treg, CD25+ Treg cells are isolated from an autologous leukapheresis product and in vitro expanded during 21 days in the presence of the additives Interleukin-2 (IL-2), rapamycin and anti-CD3/anti-CD28 expander beads. After 21 days of expansion, anti-CD3/anti-CD28 expander beads are removed from the Treg drug product. Next, Treg are frozen in aliquots of 10 Million Treg/mL until further use (5).

Twelve patients, including 10% patient loss, resulting in at least ten treated and fully evaluable patients, will be enrolled in this single-center, open-label, fast-track dose-escalation study. Autologous ex vivo expanded CD4+CD25+CD127-/lo Treg cells will be adoptively transferred in patients with ulcerative colitis with active disease or stable disease under the allowed concomintant therapy at the time of enrollment. The maximal tolerated dose (MTD) is defined as the dose that does not produce more than one dose-limiting toxicity (DLT) among a total of four treated patients at the particular dose level.

The first enrolled patient will receive the initial starting dose of 0.5 x10e6 Treg/kg bodyweight. Adoptive transfer is escalated to the next dose level (1 x 10e6 Treg/kg, 2 x 10e6 Treg/kg, 5 x 10e6/Treg/kg and 10 x 10e6 Treg/kg bodyweight), in a next patient, if no DLT occurs. Consecutive patients will be treated at least four weeks apart to monitor acute severe adverse advents. If a DLT is noted, three additional patients will receive the same dose level. Dose-escalation continues until at least two patients among a cohort of four patients experience a DLT. If two patients among a cohort of four patients experience a DLT, dose de-escalation to the highest previously tolerated dose-level will follow. Three additional patients will receive the highest previously tolerated dose. If a DLT is noted in at least two patients at the tested dose-level, dose de-escalation will continue until less than two patients have experienced a DLT. After successful enrollment at the highest dose-level, five additional patients will be enrolled at the highest dose level to extend safety assessment. If no DLTs or less than two DLTs are experienced at all dose-levels tested, the MTD is not reached. In this case, a maximal administered dose (MAD) is defined.

Study Type

Interventional

Enrollment (Actual)

11

Phase

  • Phase 1

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Locations

  • Germany
    • Bayern
      • Erlangen, Bayern, Germany, 91054
        • University of Erlangen-Nürnberg Medical School

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

14 years to 14 years (Adult)

Accepts Healthy Volunteers

No

Description

Inclusion Criteria:

  • Patients must have an established diagnosis of UC, with minimum time from diagnosis of ≥3 months
  • Patients must be either in remission under the allowed concomitant therapy or must have received all the beneficial pharmacological treatment lines before enrollment and have moderate to severe disease activity (disease should extend 15 cm or more above the anal verge) determined by a modified Mayo score (excluding the friability at grade 1 for the endoscopic sub score) of 6 to 12 with an endoscopic subscore ≥ 2 and no other individual subscore < 1.
  • Patients must have a WHO performance status of 0, 1 or 2 and must be in stable medical condition.
  • Patients must be between 18 and 75 years old and must be able and willing to give informed consent.
  • Women of child-bearing age must have a negative pregnancy test at enrollment in the study, must be willing to undergo monthly pregnancy tests until at least 3 months after adoptive Treg transfer and must oblige to use effective contraception until at least 3 months after adoptive Treg transfer. A highly effective method of birth control is defined as one that results in a low failure rate (ie, less than 1 percent per year) when used consistently and correctly, such as implants, injectables, combined oral contraceptives, some intrauterine devices (IUDs), sexual abstinence, or a vasectomized partner. For subjects using a hormonal contraceptive method, information regarding the product under evaluation and its potential effect on the contraceptive should be addressed.
  • Male study patients, who are partners of women of child-bearing age must be willing to use effective contraception until at least 3 months after adoptive Treg transfer. A highly effective method of birth control is defined as one that results in a low failure rate (ie, less than 1 percent per year) when used consistently and correctly, such as sexual abstinence, or a vasectomy. The solely use of condoms is not considered as an effective method of birth control. Therefore, partners of child-bearing age from male study patients should be willing to use implants, injectables, combined oral contraceptives or intrauterine devices (IUDs) a highly effective method of birth control. Information regarding the product under evaluation and its potential effect on the contraceptive should be addressed.
  • Patients must be willing to undergo a leukapheresis.
  • Patients must be willing to get hospitalized for at least 24 hours following adoptive Treg transfer, and to cooperate for the whole period of the trial.
  • Accomplishment of a washout phase for biological therapy of at least 8 weeks or no detectable serum trough levels prior to screening in case of a washout phase less than 8 weeks.
  • Concomitant therapy with oral corticosteroids (prednisone or equivalent up to 20 mg/day, stable for 2 weeks at inclusion), budesonide (9 mg/day, stable for 8 weeks at inclusion), 5-ASA (stable for 2 weeks at inclusion) and azathioprine (stable for 8 weeks, initiated at least 3 months ago) is permitted. Concomitant oral corticosteroids can be reduced at the investigator's discretion from visit 5 onwards (e.g. 5 mg reduction per week).≤

Exclusion Criteria:

  • Any of the above mentioned inclusion criteria are not met.
  • Impaired hematological function (on repeated testing) as indicated by Leukocyte Count ≤ 2,500 /mm3, or Neutrophils ≤ 1,000 / mm3, or Lymphocytes ≤ 700 / mm3, or Platelets ≤ 75,000 / mm3, or Hemoglobin ≤ 9 g / dl22
  • Impaired hepatic or renal function as indicated by Serum creatinine ≥ 2.5 mg/100 ml, or Serum Bilirubin ≥ 2.0 mg/100 ml
  • Any other major serious illness [e.g. active systemic infections, immunodeficiency disease, clinically significant heart disease, respiratory disease, bleeding disorders, etc.] or a contraindication to leukapheresis.
  • Evidence for HIV-1, HIV -2, HTLV-1, TPHA, HBV, or HCV infection.
  • Patients who have spent a cumulative period of 1 year or more in the UK between the beginning of 1980 and the end of 1996
  • Patients who have a family history, which places them at risk of developing Creutzfeldt-Jacob disease
  • Patients who have received a corneal or dura mater graft, or who have been treated in the past with medicines made from human pituitary glands
  • Other active autoimmune diseases (such as but not limited to Lupus erythematosus, autoimmune thyroiditis or uveitis, multiple sclerosis).
  • Previous splenectomy or radiation therapy to the spleen.
  • Patients with organ allografts.
  • Patients with celiac disease.
  • Concomitant treatment with chemotherapy, immunotherapy, any investigational drug and paramedical substances.
  • Existence or prior history of a malignant neoplasm.
  • Organic brain syndrome or significant psychiatric abnormality which would preclude participation in the full protocol and follow up.
  • Positive pregnancy test / Pregnancy or lactation. If pregnancy occurs during the course of the trial to female patients, the patient has to be excluded (not valid for partners of male patients treated).
  • Known hypersensitivities to human serum albumin and/or DMSO

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Treatment
  • Allocation: N/A
  • Interventional Model: Single Group Assignment
  • Masking: None (Open Label)

Arms and Interventions

Participant Group / Arm
Intervention / Treatment
Experimental: Regulatory T cells
Intravenous infusion of a single dose of 0.5x10e6, 1x10e6, 2x10e6, 5x10e6 or 10x10e6 Treg/kg body weight
Biological: Regulatory T cells
Autologous, ex vivo expanded, regulatory T cells

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Dose-finding
Time Frame: Visit 5 (4 weeks after adoptive Treg transfer)
To define the maximum tolerable dose (MTD) of one single infusion of autologous ex vivo expanded regulatory T cells in patients with ulcerative colitis
Visit 5 (4 weeks after adoptive Treg transfer)

Secondary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Assessment of safety of one single Infusion of regulatory T cells
Time Frame: Visit 5 (4 weeks after adoptive Treg transfer)
To define the number of patients with treatment-related adverse events as assessed by CTCAE v. 5.0
Visit 5 (4 weeks after adoptive Treg transfer)
Assessment of inflammation in the gut
Time Frame: Visit 5 (4 weeks after adoptive Treg transfer)
To define the impact on the course of UC as defined by an increase in the Mayo Clinic score of at least 3 points and an increase of at least 30% from baseline, with an accompanying increase in rectal bleeding subscore of at least 1 point.
Visit 5 (4 weeks after adoptive Treg transfer)
Assessment of quality of life
Time Frame: Visit 5 (4 weeks after adoptive Treg transfer)
To define changes in disease activity score calculated by the evaluation of the Quality of Life Inflammatory Bowel Disease Questionnaire (IBDQ)
Visit 5 (4 weeks after adoptive Treg transfer)
Assessment of Treg function in peripheral blood
Time Frame: Visit 5 (4 weeks after adoptive Treg transfer)
To define changes in Treg frequency in peripheral blood
Visit 5 (4 weeks after adoptive Treg transfer)
Assessment of Treg function in the gut
Time Frame: Visit 5 (4 weeks after adoptive Treg transfer)
To define changes in effector T cell and Treg frequencies in the gut
Visit 5 (4 weeks after adoptive Treg transfer)

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

University of Erlangen-Nürnberg Medical School

Investigators

  • Principal Investigator: Prof. Dr. med. Markus Neurath, MD, University of Erlangen-Nürnberg Medical School

Publications and helpful links

The person responsible for entering information about the study voluntarily provides these publications. These may be about anything related to the study.

General Publications

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Actual)

February 22, 2021

Primary Completion (Actual)

April 12, 2023

Study Completion (Actual)

May 22, 2023

Study Registration Dates

First Submitted

December 7, 2020

First Submitted That Met QC Criteria

December 28, 2020

First Posted (Actual)

December 31, 2020

Study Record Updates

Last Update Posted (Actual)

October 17, 2023

Last Update Submitted That Met QC Criteria

October 16, 2023

Last Verified

January 1, 2022

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

  • ER-TREG 01

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

NO

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

No

Studies a U.S. FDA-regulated device product

No

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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