Does Anesthesia Technique Impact on the Long-term Outcome 5 and 10 Years After the First Intervention in Primary Breast Cancer Surgery? A Follow-up Analysis. (CTC follow up)

June 30, 2026 updated by: University of Zurich
Goal of this observational study is to analyze data about cancer recurrence rates 5 and 10 years after primary breast cancer surgery with propofol or sevoflurane anesthesia. Only patients who were enrolled in the primary interventional trial can participate.

Study Overview

Status

Completed

Conditions

Detailed Description

It has been assumed that the type of general anesthesia impacts the release of circulating tumor cells (CTC) in the perioperative setting of breast cancer surgery. Those CTC are suspected to promote metastasis formation. We have already investigated the direct effect of sevoflurane vs. propofol on CTC in a randomized controlled trial. There was no significant difference in the number of CTC between the two treatment groups up to 72 hours after anesthesia.

CTC are a surrogate marker for cancer recurrence. Therefore, the role of the choice of the general anesthetic for breast cancer surgery should be clarified focusing on the long-term clinical outcome. In this follow-up study, we aim at defining the cancer recurrence and overall survival in patients of the sevoflurane and propofol group of the primary clinical trial.

Study Type

Observational

Enrollment (Actual)

161

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

  • Switzerland
    • Canton of Zurich
      • Zurich, Canton of Zurich, Switzerland, 8091
        • University Hospital Zurich, Institute of Anesthesiology and Perioperative Medicine

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

  • Adult
  • Older Adult

Accepts Healthy Volunteers

No

Sampling Method

Non-Probability Sample

Study Population

Only patients who participated in the clinical trial (CEC 2016 - 01791) can be included into this study.

Description

Inclusion Criteria:

  • Only patients who consented and participated in the trial CEC N° 2016 - 01791 can be enrolled.
  • GC must be available for patients with follow-up consultations at USZ.
  • For patients with follow-up consultations outside of the USZ for those with unknown GC status, and for those who declined the GC, a study-specific written informed consent must be obtained, which will allow the research team to contact the responsible physician

Exclusion Criteria:

  • Declined study-specific informed consent
  • Inability to provide study-specific consent

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

Cohorts and Interventions

Group / Cohort
Only Patient who were enrolled into the clinical trial CEC 2016 - 01791.

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Primary co-outcomes are defined as overall survival and disease-free survival.
Time Frame: 5 and 10 years after first enrollement
A 5- and 10-year follow-up will be performed for all patients participating in the initial study. In this follow-up, we aim to show both groups' cancer recurrence rates and survival curves 5 and 10 years after surgery.
5 and 10 years after first enrollement

Collaborators and Investigators

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

Sponsor

University of Zurich

Collaborators

University Hospital, Zürich

Investigators

  • Principal Investigator: Martin Schläpfer, Prof. Dr. med. M.Sc., University of Zurich
  • Study Chair: Beatrice Beck Schimmer, Prof. Dr. med, University of Zurich

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)

September 1, 2025

Primary Completion (Actual)

January 15, 2026

Study Completion (Actual)

April 30, 2026

Study Registration Dates

First Submitted

September 16, 2025

First Submitted That Met QC Criteria

June 30, 2026

First Posted (Actual)

July 8, 2026

Study Record Updates

Last Update Posted (Actual)

July 8, 2026

Last Update Submitted That Met QC Criteria

June 30, 2026

Last Verified

June 1, 2026

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

  • 2025 - 00668

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

UNDECIDED

IPD Plan Description

It is not yet known if there will be a plan to make IPD available.

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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