Hyperbaric Oxygen Therapy to Improve Autologous Fat Graft Intake in Irradiated Breast
- Conditions
- Breast ReconstructionLipofillingHyperbaric Oxygen Therapy
- Registration Number
- NCT07140198
- Lead Sponsor
- University Hospital, Geneva
- Brief Summary
The goal of this clinical trial is to learn if hyperbaric oxygen therapy (HBOT) enhances fat graft survival in lipofilling procedures in irradiated breast cancer patients. The main questions it aims to answer are:
Does it improve fat graft survival ? Evaluate safety and tolerability of HBOT in this setting? Researchers will compare patient receiving HBOT to a control group without HBOT to see if.
Sixteen female patients will undergo two autologous fat grafting sessions: one with HBOT and one without, in a randomized sequence. Patients will undergo three MRI during the study to evaluate the fat retention rate.
- Detailed Description
This is a prospective, monocentric, randomized controlled phase II crossover clinical trial designed to evaluate the efficacy and safety of hyperbaric oxygen therapy (HBOT) in improving fat graft retention following autologous fat transfer (AFT) in breast reconstruction for patients with prior radiotherapy.
AFT is widely used in breast reconstruction but is often less effective in irradiated tissues due to reduced vascularization and oxygenation, which compromises graft survival. HBOT, which involves breathing 100% oxygen at 2.5 atmospheres absolute (ATA), has been shown to promote angiogenesis and tissue oxygenation, potentially improving fat graft integration and reducing complications in irradiated tissues.
The study will enroll 16 adult female patients who have undergone radiotherapy as part of their breast cancer treatment and are scheduled to receive two sessions of AFT. Each participant will be randomized to one of two sequences:
* Sequence AB: AFT alone (control) followed by AFT + HBOT (intervention)
* Sequence BA: AFT + HBOT followed by AFT alone HBOT will be administered in five sessions (1 on Day 0, 2 on Day 1, 2 on Day 2), beginning immediately after the fat grafting procedure. Each session consists of 100% oxygen inhalation at 2.5 ATA for 90 minutes. Postoperative MRI will be performed six months after each AFT session to assess the volume of retained graft.
Primary Objective:
To determine whether HBOT significantly improves fat graft retention in irradiated breast tissue, assessed as the percentage of volume retained (measured by MRI) six months postoperatively.
Secondary Objectives:
* To assess the absolute fat volume retention in milliliters
* To evaluate the safety and tolerability of HBOT in this setting
* To assess the incidence of clinical and radiological complications (e.g., infection, hematoma, oil cysts, liponecrosis) The crossover design minimizes inter-patient variability by allowing each patient to serve as her own control. Randomization occurs immediately after the first AFT session.
The anticipated duration of participation per subject is approximately 12 to 18 months, and the total study duration is estimated at 3 years (from November 2025 to November 2028).
Recruitment & Eligibility
- Status
- NOT_YET_RECRUITING
- Sex
- Female
- Target Recruitment
- 16
- Adult (18 y.o. or more) female patients considered for lipofilling following breast reconstruction in an oncological setting which received radiation therapy on the affected breast.
- Ability to provide informed consent, documented by signature
- Pregnancy or breastfeeding
- Unability to provide informed consent
- Previous enrolment into the current investigation
Contra-indication to HBOT :
- Anamnestically reported spontaneous pneumothorax
- Status post-thoracotomy
- Significant intra-pulmonary lesions (including emphysematous bullae)
- Respiratory function disorders (both obstructive and restrictive syndromes)
- Pregnancy
- Major psychiatric disorders
- Uncontrollable claustrophobic reaction
- Seizures, even if treated and asymptomatic for some time
- Status post-severe traumatic brain injury with neurological deficits and seizures
- Decompensated heart failure
- Recent myocardial infarction (<6 months) or with persistent hemodynamic sequelae
- Spastic coronary angina
- Cardiac arrhythmias, atrioventricular block, Wolff-Parkinson-White syndrome, sinus node dysfunction, Lown-Ganong-Levine syndrome
- Cardiac pacemakers with unknown pressure resistance
- Severe bradycardia
- Sinus ostium displacement (acute or chronic)
- Displacement of the auditory canal entrance (acute or chronic)
- Status post-tympanoplasty type I-III <3 months
- Acute febrile state
- Optic neuritis
- Unstabilized hyperthyroidism
Contra-indication to MRI :
- Non-MRI-compatible pacemaker, cochlear implant, drug-infusion pump or neurostimulator.
- Metallic foreign body in critical area (eye, brain, etc.)
- Ferromagnetic vascular surgical clips of older generation, e.g., for intracranial aneurysm repair.
Study & Design
- Study Type
- INTERVENTIONAL
- Study Design
- CROSSOVER
- Primary Outcome Measures
Name Time Method Percentage of fat graft volume retained From enrollment until six months after the second lipofilling procedure. Fat graft volume retention in % is assessed by comparing preoperative and six-month postoperative MRI measurements.
- Secondary Outcome Measures
Name Time Method Absolute retention of fat graft volume Participants will be followed from enrollment to six months after the second lipofilling procedure. Six months after each lipofilling procedure, an MRI is performed to evaluate the absolute retention of fat graft volume (in mL) by comparing preoperative and postoperative MRI scans.
Clinical and radiological complications of lipofilling Outcomes will be assessed from the time of the first lipofilling procedure through six months following the second procedure. During follow-up, after each intervention, patients will be assessed for postoperative complications, including infections, hematoma, implant explantation (if applicable), and reoperation. Radiological complications will also be recorded during each MRI, such as the presence of liponecrosis or oil cysts.
Number of Participants with hyperbaric oxygen therapy Related Adverse Events. Adverse events will be monitored from the initiation of hyperbaric oxygen therapy until six months after the end of the therapy All adverse events related to hyperbaric oxygen therapy will be recorded to assess its safety in the context of the study.
Premature cessation of hyperbaric oxygen therapy, along with the reasons for discontinuation, will be recorded to assess its tolerability.