Cervical Intraepithelial NeoplasiaPhase 3NCT01929993
A Trial of Two Electrosurgical Conizations: Histopathological Analysis of Excision Margins
A Phase 3 study testing SWETZ and LLETZ cone in people with Cervical Intraepithelial Neoplasia, run by Oswaldo Cruz Foundation at 1 site in Brazil.
Trial summary
The purpose of this trial is to evaluate if Straight Wire Excision of the Transformation Zone (SWETZ) is superior to (Large Loop Excision of the Transformation Zone) LLETZ cone in reducing the incomplete excision of disease. Read more about this study
- Who is it for?
- Any age, women only
- Conditions the study is for
- Cervical Intraepithelial Neoplasia
- What is being tested?
- SWETZ and LLETZ cone
- Type of treatment
- Surgery or procedure
- Could I receive a placebo?
- No, everyone receives an active treatment
- How many people
- 164 participants
- Where
- 1 siteBrazil
- Study dates
- Jan 2008to Feb 2012
- Phase
- Phase 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 Any age
- Women only
- No healthy volunteers
- Child, Adult, Older adult
Who may be able to join
- Patients were eligible if the colposcopist decided that a cone biopsy was indicated.
- Common indications for a cone biopsy included:
- High-grade Squamous Intraepithelial Lesion in a type 3 transformation zone,
- suspicion of micro-invasive or invasive carcinoma and
- suspicion of glandular disease.
Who cannot join
- Patients were excluded if pregnancy, coagulation disorders and cervicitis were present or if they refused to participate in the study.
Trial locations and contacts
1 site in 1 country.
Brazil1 site
Fernandes Figueira Institute - Oswaldo Cruz Foundation
Rio de Janeiro, Rio de Janeiro, 22250-020
About this study
Official title: Large Loop Excision of Transformation Zone Cone Versus Straight Wire Excision of Transformation Zone : Histopathological Analysis of Excision Margins
The purpose of this trial is to evaluate if Straight Wire Excision of the Transformation Zone (SWETZ) is superior to (Large Loop Excision of the Transformation Zone) LLETZ cone in reducing the incomplete excision of disease.
Read the detailed description
Cone biopsy is a surgical procedure which objectives the excision of endocervical pre-invasive disease located at transformation zone or glandular epithelium. Although cone biopsy is considered adequate for the treatment of endocervical dysplastic epithelium , using electrosurgery as opposed to the cold knife technique of cone biopsy has been criticized because of the perceived potential for incomplete excision of disease, thermal damage and surgical specimen fragmentation, which might increase the risk of missing early invasive cancer. Also, incomplete excision margin of disease exposes women to an increased risk of residual post-treatment disease.
The standard procedure, Large Loop Excision of the Transformation Zone (LLETZ-cone), is performed with a large loop electrode of 20-25 mm depth.
The experimental intervention is Straight Wire Excision of the Transformation Zone (SWETZ), a method of excision using a 1cm straight disposal of 0.20 wire to remove the endocervical transformation zone or glandular disease.
Both procedures were previously studied in another clinical trial(NCT00995020), but the histological analysis were inconclusive for many outcomes. SWETZ were superior to LLETZ cone to acquire complete excision of disease, with no statistical significance, probably due to the small sample size.
This study objectives a better histological analyses of the surgical specimens related to incomplete excision, thermal damage and fragmentation.
- Conditions
- Cervical Intraepithelial Neoplasia
- Being tested
- SWETZ, LLETZ cone
- Keywords
- Conization, Cervical Intraepithelial Neoplasia, Cervix Dysplasia, Therapy, Electrosurgery
- Medical subject headings
- Uterine Cervical Dysplasia, Hyperthermia
What participants receive
What participants receive. In a randomised study each person is assigned to one group by chance.
SWETZProcedure or surgery
Also called NETZ - Needle excision of transformation zone
Straight wire excision of transformation zone is an electrosurgical conization method, which uses a straight wire electrode as a knife to remove the dysplastic epithelium of the cervix.
LLETZ coneProcedure or surgery
Also called LEEP - Loop electrosurgical excision procedure.
LLETZ cone is a electrosurgical conization method, which is performed with a large loop electrode of 20 mm depth. The loop is applied to the cervix outside the lateral margin of the transformation zone and brought slowly to the controlateral transformation zone margin.
| Study group | Role | What they receive |
|---|---|---|
| SWETZ | Experimental | Straight wire excision of transformation zone is an electrosurgical conization method, which uses a straight wire electrode. Receives: Procedure: SWETZ |
| LLETZ cone | Active comparator | LLETZ cone is a electrosurgical conization method, which is performed with a large loop electrode of 20 mm depth. Receives: Procedure: LLETZ cone |
What is being measured
The primary outcome is the main question the study is designed to answer.
The Prevalence of Incomplete Excision of Dysplasia at the Endocervical Excision Margin as Recognized Histologically.
Incomplete excision was considered when high-grade intraepithelial (CIN2-3) or microinvasive neoplasia was present in the endocervical limit of the excised specimen.
Measured: one month after the procedure
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted28 Aug 2013 (estimated)
- Study startJan 2008
- Primary completionDec 2011
- Study completionFeb 2012
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Posted resultsParticipant flow, outcome measures and adverse events reported by the sponsor.
- Publications (1)Papers the sponsor has linked to this study.
- Other trials for Cervical Intraepithelial NeoplasiaStudies of the same condition, open and under way.
- What the trial phases meanHow a treatment moves from first tests in people to approval.
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 3
- Primary purpose
- Treatment
- Allocation
- Randomised
- Intervention model
- Parallel groups
- Masking
- Single blind
- Who is masked
- Outcomes assessor
- Enrolment
- 164 participants (actual)
Sponsor and investigators
- Lead sponsor
- Oswaldo Cruz Foundation
- Sponsor type
- University, hospital or other
- Responsible party
- Principal investigator, MJCamargo, Oswaldo Cruz Foundation
- Investigators
- Maria J Camargo, PHD, Study director, Oswaldo Cruz Foundation
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT01929993
- Sponsor's protocol ID
- 522/12
- Status last verified
- Jun 2015
- First submitted
- 10 Jun 2012
- Last updated
- 23 Jul 2015
- Results posted
- Yes, on ClinicalTrials.gov
- Data monitoring committee
- No
Publications
Russomano F, Tristao MA, Cortes R, de Camargo MJ. A comparison between type 3 excision of the transformation zone by straight wire excision of the transformation zone (SWETZ) and large loop excision of the transformation zone (LLETZ): a randomized study. BMC Womens Health. 2015;15:12. doi: 10.1186/s12905-015-0174-5. Epub 2015 Feb 18.
PubMed 25783647
Study at a glance
From the registry record, last updated by the sponsor on 23 Jul 2015. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- Large Loop Excision of Transformation Zone Cone Versus Straight Wire Excision of Transformation Zone : Histopathological Analysis of Excision Margins
- ClinicalTrials.gov ID
- NCT01929993
- Acronym / sponsor ID
- 522/12
- Conditions
- Cervical Intraepithelial Neoplasia
- Keywords
- Conization, Cervical Intraepithelial Neoplasia, Cervix Dysplasia, Therapy, Electrosurgery
- Phase
- Phase 3
- Study type
- Interventional
- Recruitment status
- Completed
- Enrolment
- 164 participants (actual)
- Lead sponsor
- Oswaldo Cruz FoundationUniversity, hospital or other
- Study start
- Jan 2008
- Primary completion
- Dec 2011 (actual)
- Study completion
- Feb 2012 (actual)
- First posted
- 28 Aug 2013 (estimated)
- Results
- Posted 9 Jun 2015
Clinical summary
The research question as the sponsor registered it. This describes what the study plans to test, not what it found.
The purpose of this trial is to evaluate if Straight Wire Excision of the Transformation Zone (SWETZ) is superior to (Large Loop Excision of the Transformation Zone) LLETZ cone in reducing the incomplete excision of disease.
Detailed description
Cone biopsy is a surgical procedure which objectives the excision of endocervical pre-invasive disease located at transformation zone or glandular epithelium. Although cone biopsy is considered adequate for the treatment of endocervical dysplastic epithelium , using electrosurgery as opposed to the cold knife technique of cone biopsy has been criticized because of the perceived potential for incomplete excision of disease, thermal damage and surgical specimen fragmentation, which might increase the risk of missing early invasive cancer. Also, incomplete excision margin of disease exposes women to an increased risk of residual post-treatment disease.
The standard procedure, Large Loop Excision of the Transformation Zone (LLETZ-cone), is performed with a large loop electrode of 20-25 mm depth.
The experimental intervention is Straight Wire Excision of the Transformation Zone (SWETZ), a method of excision using a 1cm straight disposal of 0.20 wire to remove the endocervical transformation zone or glandular disease.
Both procedures were previously studied in another clinical trial(NCT00995020), but the histological analysis were inconclusive for many outcomes. SWETZ were superior to LLETZ cone to acquire complete excision of disease, with no statistical significance, probably due to the small sample size.
This study objectives a better histological analyses of the surgical specimens related to incomplete excision, thermal damage and fragmentation.
Study design
- Primary purpose
- Treatment
- Allocation
- Randomised
- Intervention model
- Parallel groups
- Masking
- Single blind (outcomes assessor)
- Number of arms
- 2
| Arm | Type | Receives |
|---|---|---|
| SWETZ | Experimental | Procedure: SWETZStraight wire excision of transformation zone is an electrosurgical conization method, which uses a straight wire electrode. |
| LLETZ cone | Active comparator | Procedure: LLETZ coneLLETZ cone is a electrosurgical conization method, which is performed with a large loop electrode of 20 mm depth. |
Who may qualify
- Sex
- Female only
- Healthy volunteers
- Not accepted
- Age groups
- Child, Adult, Older adult
Key inclusion criteria (5 listed)
- Patients were eligible if the colposcopist decided that a cone biopsy was indicated.
- Common indications for a cone biopsy included:
Key exclusion criteria (1 listed)
- Patients were excluded if pregnancy, coagulation disorders and cervicitis were present or if they refused to participate in the study.
Eligibility is decided by the study team after screening; this overview does not establish that a patient qualifies. Full inclusion and exclusion criteria.
Interventions
| Intervention | Type | Arms |
|---|---|---|
| SWETZAlso: NETZ - Needle excision of transformation zoneStraight wire excision of transformation zone is an electrosurgical conization method, which uses a straight wire electrode as a knife to remove the dysplastic epithelium of the cervix. | Procedure or surgery | SWETZ |
| LLETZ coneAlso: LEEP - Loop electrosurgical excision procedure.LLETZ cone is a electrosurgical conization method, which is performed with a large loop electrode of 20 mm depth. The loop is applied to the cervix outside the lateral margin of the transformation zone and brought slowly to the controlateral transformation zone margin. | Procedure or surgery | LLETZ cone |
Primary outcome
The Prevalence of Incomplete Excision of Dysplasia at the Endocervical Excision Margin as Recognized Histologically.
Time frame: one month after the procedure
Incomplete excision was considered when high-grade intraepithelial (CIN2-3) or microinvasive neoplasia was present in the endocervical limit of the excised specimen.
Results and safety
Loading the posted results from ClinicalTrials.gov…
Research links
- Official record on ClinicalTrials.govLast updated by the sponsor 23 Jul 2015.
- Posted resultsParticipant flow, baseline, all outcome measures and adverse events.
- Derived from this study: PubMed 25783647Russomano F, Tristao MA, Cortes R, de Camargo MJ. A comparison between type 3 excision of the transformation zone by straight wire excision of the transformation zone (SWETZ) and large loop excision of the transformation zone (LLETZ): a randomized study. BMC Womens Health. 2015;15:12. doi: 10.1186/s12905-015-0174-5. Epub 2015 Feb 18.
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Referral and contact
AzTrials does not enrol participants or take referrals. Contact the study team or a site listed below; they decide who can take part. This study is not recruiting at the moment.
Maria J Camargo, PHD study director
Oswaldo Cruz Foundation
1 site in 1 country: see every site and its status.
Questions about this trial
What is this clinical trial studying?
A Phase 3 study testing SWETZ and LLETZ cone in people with Cervical Intraepithelial Neoplasia, run by Oswaldo Cruz Foundation at 1 site in Brazil.
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 5 inclusion and 1 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: finished, as of the sponsor's last update on 23 Jul 2015. Status can change between updates, so confirm with the study contact before making plans.
Where is the study taking place?
The record lists 1 site in Brazil. 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 phase mean?
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 9 Jun 2015). 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?
The Prevalence of Incomplete Excision of Dysplasia at the Endocervical Excision Margin as Recognized Histologically. (time frame: one month after the procedure). It is what the study was designed to measure, not a finding.
Where can I read the original study information?
On the ClinicalTrials.gov record for NCT01929993, which also lists 1 linked publication.
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 23 Jul 2015; AzTrials last refreshed its copy on 7 Nov 2026.