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Clostridium Difficile InfectionPhase 2/3NCT03105479

Comparison of Cadazolid Versus Vancomycin in Children With Clostridium Difficile-associated Diarrhea (CDAD)

A Phase 2/3 study testing Cadazolid, Vancomycin capsule and Vancomycin solution in people with Clostridium Difficile Infection, run by Actelion at 20 sites in 9 countries.

Terminated

Stopped early. The study ended before it was planned to and will not resume.

Official record
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Trial summary

Cadazolid has demonstrated activity against a bacteria named Clostridium difficile in animal studies. The results of a first study conducted in adult patients have suggested efficacy of the new antibiotic, cadazolid, in the treatment of diarrhea caused by this bacteria. Read more about this study

Who is it for?
Ages Up to 18 years
Conditions the study is for
Clostridium Difficile Infection
What is being tested?
Cadazolid, Vancomycin capsule and Vancomycin solution
Type of treatment
Pill or oral medicine
Could I receive a placebo?
No, everyone receives an active treatment
How many people
1 participants
Where
20 sitesin 9 countries
Study dates
14 Apr 2017to 17 Apr 2018
Phase
Phase 2/3
Are there results?
Yes, posted in the registrySummary in the doctors' view

Key requirements

Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.

  • Ages Up to 18 years
  • All sexes
  • No healthy volunteers
  • Child, Adult

Who may be able to join

  • Signed informed consent by parents or legally authorized representatives (LAR) and assent by the child according to local requirements prior to initiation of any study-mandated procedure.
  • Male or female from birth to < 18 years of age, diagnosed with Clostridium Difficile-associated diarrhea (CDAD).
  • Females of childbearing potential must have a negative pregnancy test at screening and must agree to use an adequate and reliable method of contraception.

Who cannot join

  • Positive Rotavirus test for subjects < 5 years.
  • Fulminant or life-threatening CDAD.
  • More than one previous episode of CDAD in the 3 month period prior to enrollment / randomization.
  • Antimicrobial treatment active against CDAD administered within 24 h prior to screening except for metronidazole treatment failures (MTF).
  • Subjects with body weight < 3 kg.
  • Inflammatory bowel disease, chronic abdominal pain, or chronic diarrhea of any etiology.
Show all 11Show fewer
  • Fecal microbiota transplant (FMT), immunoglobulin therapy, or any investigational drug to prevent or treat CDAD within 1 month period (or 5 half-lives in case of investigational drug, whichever is longer) prior to enrollment / randomization.
  • Monoclonal antibodies against C. difficile within 6 months prior to enrollment / randomization.
  • Previous vaccination against C. difficile.
  • Known mental disorders.
  • Any circumstances or conditions, which, in the opinion of the investigator, may affect the subject's full participation in the study, or compliance with the protocol.

Trial locations and contacts

20 sites in 9 countries.

20 sites in 9 countries

United States5 sites
  • University of Chicago, Dept. Of Medicine

    Chicago, Illinois, 60637

  • Texas Children's Hospital Feigin Cente

    Houston, Texas, 77030

  • Snake River Research, PLLC

    Idaho Falls, Idaho, 83404

  • Louisiana State University Health Sciences Center - Shreveport

    Shreveport, Louisiana, 71103

  • SUNY Upstate Medical University - Upstate Golisano Children's Hospital (GCH) - Pediatric Designated AIDS Center

    Syracuse, Ohio, 13210

Other trials in United States

Poland4 sites
  • Wojewodzki Szpital Obserwacyjno-Zakazny im. Tadeusza Browicza

    Bydgoszcz, 85-030

  • Specjalistyczny Zespół Opieki Zdrowotnej nad Matką i Dzieckiem

    Poznan, 61-734

  • Gabinet Lekarski Bartosz Korczowski

    Rzeszów, 35-302

  • Klinika Gastroenterologii, Hepatologii, Zaburzeń Odżywiania i Pediatrii, Instytut "Pomnik - Centrum Zdrowia Dziecka"

    Warsaw, 04-730

Other trials in Poland

Hungary2 sites
  • Egyesített Szent István és Szent László Kórház - Rendelőintézet / Gyermekinfektológiai Osztály

    Budapest, 1097

  • Pándy Kálmán Megyei Kórház

    Gyula, 5700

Other trials in Hungary

Italy2 sites
  • Ospedale Buzzi

    Milan, 20154

  • Istituto di Ricovero e Cura a Carattere Scientifico (IRCCS) - Ospedale Pediatrico Bambino Gesu

    Roma, 00165

Other trials in Italy

Romania2 sites
  • Institutul National De Boli Infectioase "Prof. Dr. Matei Bals", sectia IX pediatrie

    Bucharest, 21105

  • Spitalul Clinic de Boli Infectioase "Sfanta Parascheva" Iasi, Clinica de Boli Infectioase I,

    Iași, 700116

Other trials in Romania

Spain2 sites
  • Hospital Sant Joan de Déu, Esplugues

    Barcelona, 8950

  • Hospital Universitario Infantil LA PAZ

    Madrid, 28046

Other trials in Spain

Belgium1 site
  • Universitair Ziekenhuis Brussel - Kinderziekenhuis

    Jette, 1090

Other trials in Belgium

Canada1 site
  • Infection Prevention & Control, AGW5 Foothills Medical Center 1403 29th Street N.W.

    Calgary, T2N 2T9

Other trials in Canada

Czechia1 site
  • FN Brno

    Brno, 62500

Other trials in Czechia

About this study

Official title: A Prospective, Multicenter Study to Investigate the Pharmacokinetics, Safety, and Efficacy of Cadazolid Versus Vancomycin in Pediatric Subjects With Clostridium Difficile-associated Diarrhea

Cadazolid has demonstrated activity against a bacteria named Clostridium difficile in animal studies. The results of a first study conducted in adult patients have suggested efficacy of the new antibiotic, cadazolid, in the treatment of diarrhea caused by this bacteria. This is the first study of cadazolid in children. The overall purpose of this study is to provide reassurance on the safety and efficacy of cadazolid in children suffering from infection due to Clostridium difficile.

Read the detailed description

This multicenter, study will be run into two parts. Both parts will be run in consecutive age cohorts, starting from the oldest age categories(12 to < 18 years old) to the youngest (birth to < 3 months).

  • Part A is an open-label, dose finding part to be conducted in at least 24 subjects.
  • Part B follows a randomized, assessor-blinded, parallel-group design with vancomycin used as an active comparator. Part B will be conducted in about 176 children.

In both parts, the treatment period will be 10 days and will be followed by a Follow-up period of 28-32 days.

Being tested
Cadazolid, Vancomycin capsule, Vancomycin solution
Keywords
vancomycin, children, cadazolid, clostridium difficile associated diarrhea
Medical subject headings
Clostridium Infections

What participants receive

What participants receive. In a randomised study each person is assigned to one group by chance.

  • CadazolidDrug

    Also called ACT-179811

    Granules for oral suspension to be administered twice daily

  • Vancomycin capsuleDrug

    Capsule containing 125 mg of vancomycin to be administered orally 4 times a day

  • Vancomycin solutionDrug

    Vancomycin powder to be administered as oral solution at a dose of 40 mg/kg/day, 3 to 4 times a day

Study groups in NCT03105479
Study groupRoleWhat they receive
Part A / Cohort AExperimentalSubjects from 12 years to 18 years old (exclusive) will receive cadazolid 500 mg per day for 10 days. The dose may be adjusted based on the pharmacokinetic (PK) and safety data reviewed for the first 3 subjects.
Receives: Drug: Cadazolid
Part A / Cohort BExperimentalSubjects from 6 years to 12 years old (exclusive) will receive cadazolid for 10 days. The dose will depend on the PK and safety data from cohort A reviewed by the Independent Data Monitoring Committee (IDMC).
Receives: Drug: Cadazolid
Part A / Cohort CExperimentalSubjects from 2 years to 6 years old (exclusive) will receive cadazolid for 10 days. The dose will depend on the PK and safety data from cohort B reviewed by the IDMC.
Receives: Drug: Cadazolid
Part A/ Cohort DExperimentalSubjects from 3 months to 2 years old (exclusive) will receive cadazolid for 10 days. The dose will depend on the PK and safety data from cohort C reviewed by the IDMC.
Receives: Drug: Cadazolid
Part A/ Cohort EExperimentalSubjects from birth to 3 months old (exclusive) will receive cadazolid for 10 days. The dose will depend on the PK and safety data from cohort D reviewed by the IDMC.
Receives: Drug: Cadazolid
Part B / CadazolidExperimentalSubjects from birth to 18 years old (exclusive) will receive cadazolid for 10 days, at the dose defined in the corresponding age cohort in Part A.
Receives: Drug: Cadazolid
Part B / VancomycinActive comparatorSubjects from birth to 18 years old (exclusive) will receive vancomycin capsule (for subjects able to swallow) or vancomycin solution (for the others) during 10 days .
Receives: Drug: Vancomycin capsule; Drug: Vancomycin solution

What is being measured

The primary outcome is the main question the study is designed to answer.

  1. Clinical Cure Rate During Part B

    This is the percentage of participants in part B reported as with a clinical cure. Clinical Cure is defined as: • <3 unformed bowel movement (UBM) per day (or no water diarrhea if subjects < 2 years of age), for at least 2 consecutive days between first dose of study treatment up to end of treatment (EOT) (inclusive) AND • Subject remains well up to EOT + 2 days (inclusive) based on investigator judgment AND • No need for additional antimicrobial treatment active against Clostridium difficile-associated diarrhea (CDAD) between first dose of study treatment up to EOT + 2 days (inclusive). percentage of subjects with a clinical cure

    Measured: Day 10 (End of Treatment) + 2 days

  2. Maximal Plasma Concentration (Cmax) of Cadazolid During Part A

    Blood samples are collected at different timepoints on Day 10 for the determination of cadazolid Cmax after 10 days of treatment.

    Measured: Day 10 (End of Treatment)

  3. Time to Reach Cmax (Tmax) of Cadazolid During Part A

    Blood samples are collected at different timepoints to determine the time when the maximal plasma concentration of cadazolid is reached.

    Measured: Day 10 (End of Treatment)

  4. Area Under the Plasma Concentration Time Curve (AUC) of Cadazolid During Part A

    Blood samples are collected at different timepoints for the determination of the cadazolid AUC over one dosing interval (0-12h) on Day 10.

    Measured: Day 10 (End of Treatment)

  5. Fecal Concentrations of Cadazolid During Part A

    A fecal sample is collected as the end-of-treatment visit in all participants in Part A.

    Measured: Day 10 (End of Treatment)

Secondary outcomes (9)
  1. Clinical Cure Rate During Part A

    This is the percentage of participants in Part A reported as with a clinical cure. Clinical Cure is defined as: • <3 unformed bowel movement (UBM) per day (or no water diarrhea if subjects < 2 years of age), for at least 2 consecutive days between first dose of study treatment up to end of treatment (EOT) (inclusive) AND • Subject remains well up to EOT + 2 days (inclusive) based on investigator judgment AND • No need for additional antimicrobial treatment active against Clostridium difficile-associated diarrhea (CDAD) between first dose of study treatment up to EOT + 2 days (inclusive).

    Measured: Day 10 (End of Treatment) + 2 days

  2. Sustained Clinical Cure Rate During Part A and Part B

    This is the percentage of participants in Parts A and B reported as with sustained clinical cure. Sustained clinical cure is defined as • Clinical Cure and no Recurrence until 30 days after the last study drug intake (end of study).

    Measured: Day 40 (on average)

  3. Recurrence Rate During Part A and Part B

    This is the percentage of participants in Parts A and B assessed as having a recurrence out of subjects meeting the criteria for Clinical Cure. Recurrence is defined as: • Clinical Cure AND New episode of diarrhea with ≥ 3 UBMs (or watery diarrhea if subject < 2 years) on any day between EOT + 3 days and end of study AND • Stool test showing positive C. difficile (as defined in Inclusion Criterion 4), AND •Antimicrobial treatment active against CDAD started between EOT + 3 days and end of study.

    Measured: Day 40 (on average)

  4. Time to Recurrence in Part B

    This it the time (in days) elapsed between the last dose of study drug and the onset day of new episode of diarrhea reported as Kaplan-Meier estimates (KM estimates)

    Measured: Day 40 (on average)

  5. Time to Resolution of Diarrhea in Part B

    This is the time (in days) elapsed between the first dose of study treatment and the resolution of diarrhea and reported as Kaplan-Meier estimates (KM estimates). The date of resolution of Diarrhea (ROD) is defined as the date of the first day of the 2 consecutive days on treatment with < 3 UBM (or no watery diarrhea for subjects < 2 years of age). Time to ROD is the time (in days) elapsed between the first dose of study treatment and the ROD

    Measured: Day 10

  6. Adverse Events Leading to Premature Discontinuation of Study Treatment

    Number of participants who prematurely discontinued the study treatment due to an adverse event

    Measured: Up to Day 10

  7. Marked Abnormalities in Clinical Laboratory Parameters

    Number of participants with any marked abnormalities in laboratory parameters up to 7 days after end of treatment

    Measured: Day 17 (on average)

  8. Marked Abnormalities in Vital Signs

    Number of subjects with any treatment-emergent abnormalities in vital signs (up to 7 days after end of treatment)

    Measured: Day 17 (on average)

  9. Treatment-emergent Adverse Events (TEAES)

    Number of subjects with any TEAEs. A TEAE is any adverse event temporally associated with the use of study treatment (from study treatment initiation until 7 days after study treatment discontinuation) whether or not considered by the investigator as related to study treatment.

    Measured: Day 17 (on average)

Timeline

From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.

  1. First posted10 Apr 2017
  2. Study start14 Apr 2017
  3. Primary completion17 Apr 2018
  4. Study completion17 Apr 2018

Why it stopped: Study suspended in October 2017 and terminated April 17, 2018 after decision to discontinue the study drug development

Resources

More details

For doctors and researchers: how the study is designed, who runs it, and its registry IDs.

Study design
Study type
Interventional
Phase
Phase 2/3
Primary purpose
Treatment
Allocation
Randomised
Intervention model
Parallel groups
Masking
Single blind
Who is masked
Outcomes assessor
Enrolment
1 participants (actual)
IDs, dates and publications
ClinicalTrials.gov ID
NCT03105479
Sponsor's protocol ID
AC-061A303
Other IDs
2015-004805-17, 2015
Status last verified
Jun 2025
First submitted
23 Mar 2017
Last updated
8 Jul 2025
Data monitoring committee
Yes
FDA-regulated drug
Yes
FDA-regulated device
No

Questions about this trial

What is this clinical trial studying?

A Phase 2/3 study testing Cadazolid, Vancomycin capsule and Vancomycin solution in people with Clostridium Difficile Infection, run by Actelion at 20 sites in 9 countries.

The full registered description is in the About this study section and the official record.

Who may be eligible to take part?

The sponsor lists 3 inclusion and 11 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.

Is this clinical trial currently recruiting?

The record says: stopped early, as of the sponsor's last update on 8 Jul 2025. Status can change between updates, so confirm with the study contact before making plans.

Where is the study taking place?

The record lists 20 sites in United States, Poland, Hungary, Italy, Romania and 4 more countries. Whether a site is taking part right now should be confirmed with that site. See every site.

What are the possible benefits and risks?

They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.

What does this combined phase mean?

Phase 2 studies give the treatment to a larger group to see whether it has the intended effect and to keep checking safety.

Phase 3 studies compare the treatment with the current standard treatment or a placebo in a large group, to confirm how well it works and watch for side effects.

Not every study follows the same path, and some studies (observational studies, device studies) have no phase.

Are results available for this study?

Yes. Results are posted in the registry (first posted 3 Apr 2019). A summary is in the For doctors view, and the full results are on ClinicalTrials.gov.

How can a doctor refer a patient or contact the research team?

The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.

What does the primary outcome measure?

Clinical Cure Rate During Part B (time frame: Day 10 (End of Treatment) + 2 days). The study lists 5 primary outcomes in all. It is what the study was designed to measure, not a finding.

Where can I read the original study information?
Does a listing mean the treatment is approved or proven to work?

No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.

How often is this information updated?

AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 8 Jul 2025.

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