Working… Menu
Help guide our efforts to modernize
Send us your comments by March 14, 2020.

C2 CryoBalloon™ 180 Ablation System Dose Escalation Study.

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Know the risks and potential benefits of clinical studies and talk to your health care provider before participating. Read our disclaimer for details. Identifier: NCT03311451
Recruitment Status : Recruiting
First Posted : October 17, 2017
Last Update Posted : February 13, 2018
Information provided by (Responsible Party):
C2 Therapeutics, Inc.

Brief Summary:
The primary objective is to determine the safety, performance and efficacy of the C2 CryoBalloon 180 Ablation System ("CryoBalloon 180") used at increasing doses in treatment naïve patients with low- or high-grade dysplastic Barrett's Esophagus (BE) or with residual BE after resection of dysplasia or early adenocarcinoma.

Condition or disease Intervention/treatment Phase
Barrett Esophagus Device: C2 CryoBalloon 180° Ablation System Not Applicable

Detailed Description:

The procedure will be performed on an outpatient basis, and the CryoBalloon 180 Ablation system will be used for all ablations following the instructions for use provided with the product.

Patients who meet the eligibility criteria will be assigned to one of the treatment groups and doses, depending on the order of their enrollment:

In phase I, the first 6 patients will be treated with Dose 1 (lowest), in one application to ablate 50% of the esophageal circumference.

All patients will undergo 8 week (±2 weeks) follow-up EGD to evaluate efficacy of the dose before the study continues.

If follow-up shows that Dose 1 eradicates ≥80% of the treated BE (by median percentage) and no SAE's are reported, this dose is defined as the therapeutic dose and enrollment will proceed to phase II.

If Dose 1 eradicates <80% of the treated BE, enrollment in Phase I will continue at the next higher dose (Second Dose). Treatment doses will be escalated in this manner until the first of the therapeutic doses (based on endoscopic exam) is determined, or the incidence of a dose-related Serious Adverse Event (SAE).

When the therapeutic dose is determined, the study will proceed to Phase II to generate additional safety and efficacy data.


Dose-related SAEs include pain in the treatment area greater than 6 (0-10 VAS score) at 24 hours AND seven (7) days post-treatment; symptomatic stricture requiring an additional EGD with endoscopic dilation before the first follow-up EGD; symptomatic stricture at follow-up EGD; or any stricture (symptomatic or asymptomatic) preventing passage of the therapeutic endoscope at follow-up EGD. Any other serious adverse events within 30 days after treatment will also be evaluated by the Data and Safety Monitoring Board (DSMB) for relationship to the dose and severity.

When a Dose-related serious adverse event occurs, the Holding Rule will be invoked and enrollment at that dose will be held until the DSMB has evaluated the event.

Layout table for study information
Study Type : Interventional  (Clinical Trial)
Estimated Enrollment : 30 participants
Intervention Model: Single Group Assignment
Intervention Model Description: Patients with previously untreated (by means of ablation therapy) flat type Barrett's Esophagus (BE) (extent BE ≤C3 and ≥M1) with Low-Grade Dysplasia (LGD) or High-Grade Dysplasia (HGD), or residual BE after endoscopic resection of dysplasia or early adenocarcinoma.
Masking: None (Open Label)
Primary Purpose: Treatment
Official Title: Clinical Trial To Evaluate Safety and Dose Response Using the C2 CyroBalloon™ 180 Ablation System for the Treatment of Dysplastic Barrett's Esophagus.
Actual Study Start Date : January 7, 2018
Estimated Primary Completion Date : August 2018
Estimated Study Completion Date : October 2018

Arm Intervention/treatment
C2 CryoBalloon 180 Ablation System
C2 CryoBalloon 180 Ablation System will be used to ablate visible Barrett's esophagus
Device: C2 CryoBalloon 180° Ablation System
The C2 CryoBalloon 180° Ablation System is a cryosurgical device with a nitrous oxide cooled balloon probe that is compatible with upper gastrointestinal therapeutic endoscopes.
Other Name: CryoBalloon 180

Primary Outcome Measures :
  1. Safety: Incidence of Dose-related SAEs [ Time Frame: 30 days ]

    Safety will be evaluated by the incidence of Dose-related SAEs.

    Dose-related SAEs include pain in the treatment area, or any stricture (symptomatic or asymptomatic) preventing passage of the diagnostic endoscope at follow-up EGD.

  2. Efficacy: Dose response [ Time Frame: 8 weeks ]
    Dose response (efficacy) is defined as eradication percentage of BE confirmed by histological evidence of eradication of BE, after treatment with the therapeutic dose (phase II).

Secondary Outcome Measures :
  1. Incidence of AEs [ Time Frame: 30 days ]
    Incidence of all serious and non-serious adverse events up to 30 days post-treatment

  2. Pain [ Time Frame: 24hours and 7 days post-procedure ]
    Post-procedure pain in the area of the cryoablation treatment (0-10 VAS score)

  3. Efficacy: Percent Regression [ Time Frame: 8 weeks ]
    Efficacy, defined as the regression percentage at the first follow-up endoscopy, after one (1) treatment covering 50% of circumference of the esophagus with the therapeutic dose.

  4. Efficacy: Treatment [ Time Frame: 8 weeks ]
    Efficacy of treatment with CryoBalloon 180 Ablation system, defined as the proportion of patients with ≥80% regression of BE after 1 hemi-circumferential and after full circumferential treatment.

Information from the National Library of Medicine

Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the contacts provided below. For general information, Learn About Clinical Studies.

Layout table for eligibility information
Ages Eligible for Study:   18 Years and older   (Adult, Older Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No

Inclusion Criteria:

  1. Patients with flat- type BE esophagus, with an indication for ablation therapy, defined as:

    • Diagnosis of LGD or HGD in BE (confirmed by central pathology review), OR
    • Residual BE with any grade of dysplasia 6 weeks after endoscopic resection
  2. Prague Classification Score C≤3 and ≥M1
  3. Patients should be ablation-naïve (no previous ablation therapy of the esophagus)
  4. Older than 18 years of age at time of consent
  5. Operable per institution's standards
  6. Patient provides written informed consent on the IRB-approved informed consent form
  7. Patient is willing and able to comply with follow-up requirements.

Exclusion Criteria:

  1. Esophageal stenosis preventing advancement of a therapeutic endoscope
  2. Any endoscopically visualized lesion such as ulcers, masses or nodules. Neoplastic nodules must first be treated with ER >6 weeks prior to planned treatment under this protocol.
  3. Prior ER of more than 2cm in length or >50% of the esophageal lumen circumference
  4. History of locally advanced (>SM1) esophageal cancer
  5. History of esophageal varices
  6. Prior distal esophagectomy
  7. Active esophagitis LA grade B or higher
  8. Severe medical comorbidities precluding endoscopy
  9. Uncontrolled coagulopathy
  10. Pregnant or planning to become pregnant during period of study
  11. Patient refuses or is unable to provide written informed consent
  12. Participation in another study with investigational drug within the 30 days preceding or during the present study, interfering with participation in the current study
  13. General poor health, multiple co-morbidities placing the patient at risk or otherwise unsuitable for trial participation

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 identifier (NCT number): NCT03311451

Layout table for location contacts
Contact: Marcia Wachna 650-316-8601
Contact: Bas LA Weusten, MD, PhD 31306099111

Layout table for location information
AMC Medical Research B.V. Recruiting
Amsterdam, Netherlands
Contact: Sanne Van Munster, MD         
Principal Investigator: Jacques Bergman, MD, PhD         
Catharina Ziekenhuis te Eindoven Recruiting
Eindhoven, Netherlands
Contact: Anouk Overwater, MD    31887550224   
Principal Investigator: Erik Schoon, MD         
UMC Groningen Recruiting
Groningen, Netherlands
Contact: Anouk Overwater, MD    31887550224   
Principal Investigator: Wouter Nagengast, MD, PhD         
St. Antonius Hospital Recruiting
Nieuwegein, Netherlands
Contact: Anouk Overwater, MD   
Principal Investigator: Bas L Weusten, MD, PhD         
UMC Utrecht Recruiting
Utrecht, Netherlands
Contact: Anouk Overwater, MD    31887550224   
Principal Investigator: Bas Weusten, MD, PhD         
Sponsors and Collaborators
C2 Therapeutics, Inc.
Layout table for investigator information
Principal Investigator: Bas LA Weusten, MD, PhD St. Antonius Ziekenhuis, Niewegein The Netherlands

Layout table for additonal information
Responsible Party: C2 Therapeutics, Inc. Identifier: NCT03311451    
Other Study ID Numbers: CP-0019
First Posted: October 17, 2017    Key Record Dates
Last Update Posted: February 13, 2018
Last Verified: February 2018
Individual Participant Data (IPD) Sharing Statement:
Plan to Share IPD: No
Plan Description: Data will not be shared.

Layout table for additional information
Studies a U.S. FDA-regulated Drug Product: No
Studies a U.S. FDA-regulated Device Product: Yes
Device Product Not Approved or Cleared by U.S. FDA: Yes
Product Manufactured in and Exported from the U.S.: Yes
Additional relevant MeSH terms:
Layout table for MeSH terms
Barrett Esophagus
Precancerous Conditions
Esophageal Diseases
Gastrointestinal Diseases
Digestive System Diseases