Clinical trial NCT03348293: Safety Study of 3D Printing Personalized Biodegradable Implant for Breast Reconstruction
Official title: Safety Study of 3D Printing Personalized Biodegradable Implant for Breast Reconstruction
Study type: INTERVENTIONAL
Overall status: RECRUITING
Phase: PHASE1
Conditions: Breast Reconstruction
Breast Cancer
Keywords: biodegradable scaffold
immediate breast reconstruction
3D printing
Lead sponsor: Xijing Hospital
Sponsor class: OTHER
First posted: 2017-11-20
Enrollment: 30
Sex: FEMALE
Minimum age (years): 18
Maximum age (years): 60
Standard ages: ADULT
Accepts healthy volunteers: no
Allocation: NA
Intervention model: SINGLE_GROUP
Primary purpose: TREATMENT

Brief summary: Scope of tumor resection was simulated according to the MR imaging data. After meticulous design, the investigators created the personalized porous biodegradable scaffold and printed by 3D printer, using porous PCL biomaterials. During operation, the biodegradable scaffold was implanted into the defective cavity after tumor resection. Safety indicator, cosmetic outcome and autologous compatibility were evaluated.

Detailed description: 3D image reconstruction and printing Magnetic model images data were firstly produced by Siemens Trio Tim 3. 0 T MRI. The relative scanning parameters were adjusted as follows: layer thickness 0.9mm; pixel pitch 0.625 mm. In general, the thicker the layer thickness and pixel pitch, the better resolution and the more similar reconstructed model the investigators will get. The MRI data were then imported into Mimics 17.0® \[Materialise, Leuven, Belgium\] for 3D reconstruction of the targeted area. In this software, the investigators can adjust threshold value to acclimatize to segment tumor area. After that, 3D models were calculated and output as .stl files. According to the requirements of surgical planning, the scope of tumor resection was created after 2 cm expansion of the tumor area, that is, the filling scope of the implant. Next, the investigators designed the personalized porous degradable scaffold. In order to guarantee no significant differences and deformation of the implanted scaffold, the investigators used the contour of tumor resection as the boundary of the scaffold, with flexible porous structure as the units of the scaffold. Boolean operation can help to achieve this target. Finally, the printing of the personalized porous biodegradable scaffold was carried out. Biologically active material PCL was selected and the deformation and degradation time were set for 2 years by adjusting the molecular weight of PCL. Theoretically, PCL with the molecular weight above 65,000 can stably exist for 2 years in vivo, and then it will gradually degrade into H2O and CO2.The PCL material was put into the 3D printer, which was developed by the State key laboratory for mechanical manufacturing systems engineering of Xi'an Jiaotong university. The personalized porous biodegradable scaffold was completed after printing and removing supports.

Procedure In this study,the investigators produced the bio-implant at least 10 days before surgery. Before surgery, the printed bio-implant has been prepared and obtained full sterilization. Simply, under general anaesthesia, lumpectomy and sentinel-lymph-node biopsy was performed firstly, followed by 3D-printing scaffold transplantation.

Eligibility criteria: Inclusion Criteria:

* Breast cancer patients
* Tumor sized 3 cm to 6 cm
* ECOG score 1-2
* Multiple diffuse lesions in one quadrant
* Written informed consent

Exclusion Criteria:

* Triple negative breast cancer patients
* Participant in another clinical study
* Pregnancy and breastfeeding
* Patients with nipple infringement
* Inflammatory breast carcinoma
* Paget's disease
* Serious operative contraindication
* Contraindication for MRI

Primary outcomes:
measure: adverse events
timeFrame: 1 year after surgery
Secondary outcomes:
measure: Cosmetic outcome
timeFrame: 6 months after surgery
measure: Satisfaction of patients
timeFrame: 6 months after surgery
measure: Recurrence rate
timeFrame: 5 year after surgery
measure: 5-Year disease free survival
timeFrame: 5 year after surgery
Other outcomes:
Locations:
city: Xi'an
country: China
facility: Xijing hospital
state: Shaanxi
Study officials:
References:
citation: The utility of 3D printing for surgical planning and patient-specific implant design for complex spinal pathologies: case report. J Neurosurg Spine. 2017 Apr;26(4):513-518. doi: 10.3171/2016.9.SPINE16371. Epub 2017 Jan 20.
citation: Chia HN, Wu BM. Recent advances in 3D printing of biomaterials. J Biol Eng. 2015 Mar 1;9:4. doi: 10.1186/s13036-015-0001-4. eCollection 2015.
citation: Ibrahim AM, Jose RR, Rabie AN, Gerstle TL, Lee BT, Lin SJ. Three-dimensional Printing in Developing Countries. Plast Reconstr Surg Glob Open. 2015 Aug 10;3(7):e443. doi: 10.1097/GOX.0000000000000298. eCollection 2015 Jul.