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Safety and Efficacy Study of PTG-100 in the Treatment of Moderate to Severe Ulcerative Colitis

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ClinicalTrials.gov Identifier: NCT02895100
Recruitment Status : Terminated (Data Monitoring Committee discontinued the trial due to futility-based outcome)
First Posted : September 9, 2016
Results First Posted : March 22, 2021
Last Update Posted : October 22, 2021
Information provided by (Responsible Party):
Protagonist Therapeutics, Inc.

Brief Summary:
The main objectives of this study are to evaluate the efficacy, safety, and tolerability of daily doses of PTG-100 in subjects with moderate to severe ulcerative colitis (UC).

Condition or disease Intervention/treatment Phase
Ulcerative Colitis Drug: PTG-100 Drug: Placebo Phase 2

Detailed Description:

This is a Phase II multi-centre, double blind, randomised, placebo-controlled, clinical study to evaluate the efficacy, safety, and tolerability of an oral peptide, PTG-100, administered as capsules for 12 weeks in subjects with moderate to severe UC.

Following screening procedures and confirmation of subject eligibility, subjects will be randomised 1:1:1:1 to one of three daily doses of PTG-100 (150, 300 or 900 mg) or placebo. Stratification will be based on subjects' prior treatment with anti-TNF agents, with a maximum of 50% of subjects with prior unsuccessful anti-TNF agent treatments. Subjects will be treated with study drug for 12 weeks. Sigmoidoscopies will be performed at the Screening Visit and on Week 12. A final Follow Up Visit will occur on Week 16, when subject has been off study treatment for 4 weeks. Clinical, safety, pharmacokinetic (PK) and pharmacodynamic (PD) parameters will be evaluated on an ongoing basis during the 16 week study.

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Study Type : Interventional  (Clinical Trial)
Actual Enrollment : 98 participants
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Triple (Participant, Care Provider, Investigator)
Primary Purpose: Treatment
Official Title: A Phase 2b Randomised, Double-blind, Placebo-controlled, Parallel, Adaptive 2-Stage, Multi-Centre Study to Evaluate the Safety and Efficacy of Oral PTG-100 Induction in Subjects With Moderate to Severe Active Ulcerative Colitis
Study Start Date : December 2016
Actual Primary Completion Date : March 26, 2018
Actual Study Completion Date : March 26, 2018

Resource links provided by the National Library of Medicine

Arm Intervention/treatment
Experimental: PTG-100 (150 mg QD)
Low dose
Drug: PTG-100
Daily dosing of PTG-100 by subject for a 12 week treatment period.

Experimental: PTG-100 (300 mg QD)
Medium dose
Drug: PTG-100
Daily dosing of PTG-100 by subject for a 12 week treatment period.

Experimental: PTG-100 (900 mg QD)
High dose
Drug: PTG-100
Daily dosing of PTG-100 by subject for a 12 week treatment period.

Placebo Comparator: Placebo group
Placebo control
Drug: Placebo
Daily dosing of Placebo capsules by subject for a 12 week treatment period.

Primary Outcome Measures :
  1. Proportion of Subjects Receiving PTG-100 With Clinical Remission at Week 12 Compared With Placebo [ Time Frame: 12 week treatment period ]
    The primary efficacy endpoint for this study was the proportion of subjects receiving PTG-100 with clinical remission at Week 12. Clinical remission was defined using the Mayo subscores of stool frequency, rectal bleeding, and endoscopy.

Information from the National Library of Medicine

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Ages Eligible for Study:   18 Years to 80 Years   (Adult, Older Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No

Inclusion Criteria include:

  • Male and female subjects age 18 to 80 years, inclusive
  • Diagnosis of UC for at least 2 months prior to screening
  • Moderate to severe active UC as defined by Mayo Score of 6 to 12 inclusive (range of 0-12) at baseline with endoscopy score of at least 2 (range 0-3)
  • Subject must have had an inadequate response, loss of response to or intolerance to at least of of the following medications: immunomodulators, TNF-alpha antagonists or corticosteroids
  • Subject is unlikely to conceive, as defined by one of the following: a) subject is male, b) subject is surgically sterilized female, c) subject is post-menopausal female >= 45 years of age with clinical documentation of menopause, or d) subject is woman of child bearing potential (WOCBP) and agrees to abstain from heterosexual activity, use adequate hormonal contraception or use double barrier contraception.
  • For WOCBP, a negative pregnancy test at screening and within 24 hours of first dose of study medication

Exclusion Criteria include:

  • Subject has Crohn's Disease (CD), indeterminate colitis (IC) or presence or history of fistula with CD
  • History of toxic megacolon, abdominal abscess, symptomatic colonic stricture or stoma; history or is at imminent risk of colectomy
  • History or current evidence of colonic dysplasia or adenomatous colonic polyps
  • Current bacterial or parasitic pathogenic enteric infection, including Clostridium difficile, infection with hepatitis B or C virus, infection with human immunodeficiency virus, infection requiring hospitalisation or intravenous antimicrobial therapy, or opportunistic infection within 6 months, any infection requiring antimicrobial therapy within 2 weeks, history of more than one episode of herpes zoster or any episode of disseminated zoster
  • Live virus vaccination within one month prior to screening
  • Subject has a concurrent clinically significant, unstable, or uncontrolled cardiovascular, pulmonary, hepatic, renal, gastrointestinal, genitourinary, hematological, coagulation, immunological, endocrine/metabolic, or other medical disorder that, in the opinion of the investigator, might confound the study results or poses additional risk to the subject
  • Known primary or secondary immunodeficiency
  • History of myocardial infarction, unstable angina, transient ischaemic attack, decompensated heart failure requiring hospitalisation, congestive heart failure (NYHA Class 3 or 4), uncontrolled arrhythmias, cardiac revascularisation, stroke, uncontrolled hypertension, or uncontrolled diabetes within 6 months of screening
  • Clinically meaningful laboratory abnormalities at screening
  • Pregnant or lactating females
  • Any surgical procedure requiring general anaesthesia within one month prior to screening, or planned elective surgery during the study
  • History of malignant neoplasms or carcinoma in situ within 5 years prior to screening
  • History of any major neurological disorders, as judged by the Investigator, or positive progressive multifocal leukoencephalopathy (PML) subjective symptom checklist
  • Current or recent history of alcohol dependence or illicit drug use within 1 year prior to screening.
  • Subject is mentally or legally incapacitated at the time of screening visit or has a history of clinically significant psychiatric disorders that would impact the subject's ability to participate in the trial according to the investigator
  • Unable to attend study visits or comply with procedures
  • Concurrent participation in any other interventional study.

Information from the National Library of Medicine

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): NCT02895100

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Sponsors and Collaborators
Protagonist Therapeutics, Inc.
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Study Director: Director Clinical Development Protagonist Therapeutics, Inc.
  Study Documents (Full-Text)

Documents provided by Protagonist Therapeutics, Inc.:
Study Protocol  [PDF] November 16, 2017
Statistical Analysis Plan  [PDF] September 8, 2016

Publications automatically indexed to this study by ClinicalTrials.gov Identifier (NCT Number):
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Responsible Party: Protagonist Therapeutics, Inc.
ClinicalTrials.gov Identifier: NCT02895100    
Other Study ID Numbers: PTG-100-02
First Posted: September 9, 2016    Key Record Dates
Results First Posted: March 22, 2021
Last Update Posted: October 22, 2021
Last Verified: September 2021
Individual Participant Data (IPD) Sharing Statement:
Plan to Share IPD: Undecided
Keywords provided by Protagonist Therapeutics, Inc.:
ulcerative colitis
inflammatory bowel disease
Propel Study
Additional relevant MeSH terms:
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Colitis, Ulcerative
Gastrointestinal Diseases
Digestive System Diseases
Colonic Diseases
Intestinal Diseases
Pathologic Processes
Inflammatory Bowel Diseases