Enrichment of autologous fat grafts with ex-vivo expanded adipose tissue-derived stem cells for graft survival: a randomised placebo-controlled trial.
BACKGROUND
Autologous fat grafting is increasingly used in reconstructive surgery. However, resorption rates ranging from 25% to 80% have been reported. Therefore, methods to increase graft viability are needed. Here, we report the results of a triple-blind, placebo-controlled trial to compare the survival of fat grafts enriched with autologous adipose-derived stem cells (ASCs) versus non-enriched fat grafts.


METHODS
Healthy participants underwent two liposuctions taken 14 days apart: one for ASC isolation and ex-vivo expansion, and another for the preparation of fat grafts. Two purified fat grafts (30 mL each) taken from the second liposuction were prepared for each participant. One graft was enriched with ASCs (20 × 10(6) cells per mL fat), and another graft without ASC enrichment served as a control. The fat grafts were injected subcutaneously as a bolus to the posterior part of the right and left upper arm according to the randomisation sequence. The volumes of injected fat grafts were measured by MRI immediately after injection and after 121 days before surgical removal. The primary goal was to compare the residual graft volumes of ASC-enriched grafts with those of control grafts. This study is registered at www.clinicaltrialsregister.eu, number 2010-023006-12.


RESULTS
13 participants were enrolled, three of whom were excluded. Compared with the control grafts, the ASC-enriched fat grafts had significantly higher residual volumes: 23·00 (95% CI 20·57-25·43) cm(3) versus 4·66 (3·16-6·16) cm(3) for the controls, corresponding to 80·9% (76·6-85·2) versus 16·3% (11·1-21·4) of the initial volumes, respectively (p<0·0001). The difference between the groups was 18·34 (95% CI 15·70-20·98) cm(3), equivalent to 64·6% (57·1-72·1; p<0·0001). No serious adverse events were noted.


CONCLUSIONS
The procedure of ASC-enriched fat grafting had excellent feasibility and safety. These promising results add significantly to the prospect of stem cell use in clinical settings, and indicate that ASC graft enrichment could render lipofilling a reliable alternative to major tissue augmentation, such as breast surgery, with allogeneic material or major flap surgery.


BACKGROUND
Danish Cancer Society, Centre of Head and Orthopaedics Rigshospitalet, and Moalem Weitemeyer Bendtsen.
Department of Plastic Surgery, Breast Surgery and Burns, Rigshospitalet, Copenhagen University Hospital, Copenhagen, Denmark. stigfrederik@gmail.com
Stig-Frederik Trojahn
SF
Kølle
Anne
A
Fischer-Nielsen
Anders Bruun
AB
Mathiasen
Jens Jørgen
JJ
Elberg
Roberto S
RS
Oliveri
Peter V
PV
Glovinski
Jens
J
Kastrup
Maria
M
Kirchhoff
Bo Sonnich
BS
Rasmussen
Maj-Lis Møller
ML
Talman
Carsten
C
Thomsen
Ebbe
E
Dickmeiss
Krzysztof Tadeusz
KT
Drzewiecki
D017667:Adipocytes / Q000637:transplantation*; D000273:Adipose Tissue / Q000637:transplantation*; D000293:Adolescent; D000328:Adult; D001132:Arm; D005240:Feasibility Studies; D005260:Female; D006085:Graft Survival / Q000502:physiology; D006801:Humans; D015187:Lipectomy / Q000379:methods; D008297:Male; D008875:Middle Aged; D033581:Stem Cell Transplantation / Q000379:methods*; D014182:Transplantation, Autologous; D055815:Young Adult