References of "Somja, Joan"
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See detailInfusion of third-party mesenchymal stromal cells after liver transplantation: a phase 1, open-label, clinical study
DETRY, Olivier ULg; VANDERMEULEN, Morgan ULg; DELBOUILLE, Marie-Hélène ULg et al

Poster (2015, March 27)

Transplanted patients have to deal with numerous side effects of life-long dependence on immunosuppressive drugs. Paradoxically these drugs fail to prevent acute and/or chronic rejection in many cases ... [more ▼]

Transplanted patients have to deal with numerous side effects of life-long dependence on immunosuppressive drugs. Paradoxically these drugs fail to prevent acute and/or chronic rejection in many cases. Mesenchymal stromal cells (MSC) are multipotent and self-renewing bone marrow progenitors that have been shown both in vitro and in vivo as capable of (i) immunomodulation, (ii) anti-inflammation in case of ischemia/reperfusion injury, and (ii) stimulation of tissue repair. MSC could therefore be very interesting in organ recipients to limit chronic graft damage and to allow tolerance. This study aimed to be the first clinical evaluation of the safety and tolerability of MSC infusion after liver transplantation in a prospective, controlled, phase I study. Clinical grade MSCs were locally collected from the bone marrow of unrelated healthy donors. They were cultured in a GMP-compliant lab, underwent extensive quality controls and were frozen for storage in a MSC bank. When needed for patient treatment, MSC were thawed and intravenously injected into patients. 10 liver transplant recipients under standard immunosuppression (TAC-MMF-low dose steroids until day 30) received 1.5-3x106/kg MSC on post- operative day 3 ± 2. These patients were prospectively compared to a group of 10 control (MSC-) liver recipients. Primary endpoints were MSC infusion toxicity, and incidence of cancer and opportunistic infections at month 6. Secondary endpoints were patient and graft survivals and rejection at month 6, as well as the effects of MSC on recipients’ immune function and on immunohistology of at month 6 graft biopsies. No MSC infusional toxicity was observed. Both groups were comparable in terms of donor and recipient characteristics. There was no difference in primary end-points between control and MSC groups. No patient developed de novo cancer. There was no statistical difference in patient and graft survivals or in rejection rates. There was no graft rejection in the MSC group. Month-6 graft biopsies were not different according to Banff and fibrosis scores. This phase I study showed excellent tolerability and safety of a single infusion of third-party MSC after liver transplantation. There were no graft safety issues and no excess of immunosuppression after MSC injection. Further analyses of consequences of MSC injection on the immune profile are needed. The possibility of avoiding calcineurin-inhibitors with repeated MSC injections as main immunosuppressive therapy and/of tolerance induction by MSC infusion should be investigated by further studies. [less ▲]

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See detailUnique recurrence patterns of cervical intraepithelial neoplasia following excision of the squamo-columnar junction.
Herfs, Michael ULg; SOMJA, Joan ULg; Howitt, Brooke E. et al

in International journal of cancer. Journal international du cancer (2015), 136

Recent studies have identified a putative cell of origin for cervical intraepithelial neoplasia (CIN) and cervical cancer at the squamo-columnar junction (SCJ) and suggest that these cells may not ... [more ▼]

Recent studies have identified a putative cell of origin for cervical intraepithelial neoplasia (CIN) and cervical cancer at the squamo-columnar junction (SCJ) and suggest that these cells may not regenerate following excision (LEEP). This study addressed the impact of SCJ excision on the temporal dynamics, histologic and viral (HPV) characteristics of recurrent CIN. One hundred thirty one consecutive patients treated by excision and attending follow-up visits were enrolled. We compared recurrent and initial CIN with attention to excision margins, timing of recurrence, CIN grade, HPV types, p16 immunophenotype, and SCJ immunophenotype. During the follow-up period (up to four years), sixteen (12.2%) recurrences were identified. Four (25%) were identified at the first follow-up visit, closely resembled the initial CIN 2/3 in grade and HPV type, and were typically SCJ marker positive [SCJ(+)], suggesting non-excised (residual) disease. Twelve (75%) manifested after the first postoperative visit and all were in the ectocervix or in mature metaplastic epithelium. All of the 12 delayed recurrences were classified as CIN 1 and were SCJ (-). Nine of 11 SCJ (-) recurrences (82%) followed regressed spontaneously. Taken together, these results show that new lesions developing from any HPV infection are delayed and occur within the ectocervix or metaplastic epithelium. This dramatically lower risk of CIN 2/3 following successful SCJ excision suggests that removal of the SCJ could be a critical variable in reducing the risk of subsequent CIN 2/3 and cervical cancer. (c) 2014 Wiley Periodicals, Inc. [less ▲]

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See detailInfusion of third-party mesenchymal stream cells after liver transplantation: a phase-1, open-label, clinical study
DETRY, Olivier ULg; VANDERMEULEN, Morgan ULg; DELBOUILLE, Marie-Hélène ULg et al

in Acta Gastro-Enterologica Belgica (2015, March), 78(1), 29

Background: Mesenchymal stromal cells (MSC) are multipotent bone marrow progenitors that have demonstrated significant immunosuppressive effects in various in vivo and in vitro studies. This study aimed ... [more ▼]

Background: Mesenchymal stromal cells (MSC) are multipotent bone marrow progenitors that have demonstrated significant immunosuppressive effects in various in vivo and in vitro studies. This study aimed to be the first evaluation of the safety and tolerability of MSC infusion after liver transplantation in a prospective, controlled phase-1 study. This study aimed to be the first evaluation of the safety and tolerability of MSC infusion after liver transplantation in a prospective, controlled phase-1 study. Patients & Methods: Clinical grade MSCs were locally collected from the bone marrow of unrelated healthy donors. They were cultured in a GMP-compliant lab, underwent extensive quality controls and were frozen for storage in a MSC bank. When needed for patient treatment, MSC were thawed and intravenously injected into patients. 10 liver transplant recipients under standard immunosuppression (TAC-MMF-low dose steroids until day 30) received 1.5-3x106/kg MSC on post-operative day 3±2. These patients were prospectively compared to a group of 10 control (MSC-) liver recipients. Primary endpoints were MSC infusion toxicity, and incidence of cancer and opportunistic infections at month 6. Secondary endpoints were patient and graft survivals and rejection at month 6, as well as the effects of MSC on recipients’ immune function and on immunohistology of at month 6 graft biopsies. Results: No MSC infusional toxicity was observed. Both groups were comparable in terms of donor and recipient characteristics. There was no difference in primary end-points between control and MSC groups. No patient developed de novo cancer. There was no statistical difference in patient and graft survivals or in rejection rates. There was no graft rejection in the MSC group. Month-6 graft biopsies were not different according to Banff and fibrosis scores. Discussion: This phase 1 study showed excellent tolerability and safety of a single infusion of third-party MSC after liver transplantation. There were no graft safety issues and no excess of immunosuppression after MSC injection. Further analyses of consequences of MSC injection on the immune profile are needed. The possibility of avoiding calcineurin-inhibitors with repeated MSC injections as main immunosuppressive therapy and/of tolerance induction by MSC infusion should be investigated by further studies. [less ▲]

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See detailComparison of early stages of colorectal cancer by label free proteomics
QUESADA CALVO, Florence ULg; MEUWIS, Marie-Alice ULg; Bertrand, Virginie ULg et al

in Acta Gastroenterologica (2015, February 27)

Introduction and objectives: Colorectal cancer (CRC) is the second most frequent cancer in women and the third in men. Identification of the mechanisms of progression in these early CRC stages is ... [more ▼]

Introduction and objectives: Colorectal cancer (CRC) is the second most frequent cancer in women and the third in men. Identification of the mechanisms of progression in these early CRC stages is important to develop new diagnostic and therapeutic tools. Formalin-Fixed Paraffin-Embedded (FFPE) specimens are materials that enable proteomic clinical research. Hence our aim was to address the comparison of FFPE samples from early CRC stages patients using shotgun proteomic analysis. Methods: We performed a retrospective study on 36 CRC tissue samples (pT1N0M0, n=16 and pT2N0M0, n=20) compared together and with 40 control tissue samples (20 patients with diverticulitis, using paired inflamed (DI) and healthy tissue (DH)). Each tissue slice was macrodissected to enrich in epithelial cells. We used FFPE-FASP kit (Expedeon) for sample preparation and protein digests were analyzed using 2D-nanoAquity UPLC separation online with Q-Tof Synapt HDMSTM G2 using ion mobility as additional separation. We performed protein identification and differential analysis using Progenesis QI for proteomics (Nonlinear Dynamics). Results and discussion: We selected 149 proteins differentially distributed between T1 and T2 CRC stages which were not significantly different between CRC and DH or DI. Only 30 proteins were significantly more abundant in T1 versus T2 and 119 were distributed inversely, with a minimum fold ratio of 2. Among those, ATP synthase subunit beta, Aspartate-tRNA ligase, Haptoglobin and Kininogen were identified. . Moreover, we validated Kininogen and 3 others proteins with a significant differential distribution between pT1N0M0 and pT2N0M0 stages by immunohistochemistry. Conclusion: This FFPE retrospective study comparing T1 and T2 CRC highlighted proteins already previously identified as potential CRC biomarkers. These proteins may reflect important early changes in cancer development and may help understanding early tumor progression. [less ▲]

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See detail18F-FPRGD2 PET/CT imaging of integrin αvβ3 in renal carcinomas: Correlation with histopathology
WITHOFS, Nadia ULg; SIGNOLLE, NICOLAS; SOMJA, Joan ULg et al

in Journal of Nuclear Medicine (The) (2015)

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See detailAzacytidine prevents experimental sclerodermic chronic graft-versus-host disease
Fransolet, Gilles ULg; Ehx, Grégory ULg; SOMJA, Joan ULg et al

Poster (2015, January 30)

Introduction: Graft-versus-host disease (GVHD) remains one major complication of allogeneic hematopoietic stem cell transplantation (HSCT). Following unmanipulated peripheral-blood stem cell ... [more ▼]

Introduction: Graft-versus-host disease (GVHD) remains one major complication of allogeneic hematopoietic stem cell transplantation (HSCT). Following unmanipulated peripheral-blood stem cell transplantation, 60% of the patients experience chronic GVHD while approximately 15% of them develop a sclerodermic form of chronic GVHD characterized by multiple organ fibrosis and loss of skin elasticity. Regulatory T cells (Tregs) play a pivotal role in the pathology of chronic GVHD by inhibiting alloreactive conventional T cells. Several studies have shown the hypomethylating agent Azacytidine (Aza) can demethylate the master transcription factor of Treg (Forkhead box protein 3 factor, FoxP3), thus promoting Treg differentiation of conventional T cells. This work investigates the impact of Aza in a classical murine model of sclerodermic chronic GVHD (B10.D2  BALB/cJ). Methods: Lethally irradiated BALB/cJ recipient mice were injected with 107 bone marrow cells + 7.107splenocytes from B10.D2 donor mice. Recipients were treated with subcutaneous injections of Aza at the dose of 0,5 or 2 mg/kg every two days from day 10 to 30 following transplantation. Mice GVHD was evaluated with five criteria (weight loss, activity, fibrosis, hair loss and mice posture; 0-1-2 points/criteria). Mice were sacrificed at a score of 8/10 (or > 20% weight loss). Results: Mice treated with Aza 0.5 mg/kg (n = 14) or 2 mg/kg (n = 17) had significant lower clinical scores compared to control ones (n = 15) after treatment. FACS analysis showed a higher proportion of Treg among CD4+ T cells in the blood of Aza 2 mg/kg mice than in control mice (P = 0.047), as well as a higher percentage of Tregs expressing the KI67 proliferative marker on the same day (P = 0.0005). Finally, analyses of the cellular blood components with Cell-dyn demonstrated that Aza 2 mg/kg treated mice were significantly lymphopenic as compared to control mice (P = 0.05). Conclusion : Aza prevented sclerodermic GVHD in this classical murine model of chronic GVHD. [less ▲]

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See detailInfusion of clinical-grade enriched regulatory T cells delays experimental xenogeneic graft-versus-host disease
Hannon, Muriel ULg; LECHANTEUR, Chantal ULg; Lucas, Sophie et al

in Transfusion (2014), 54(February), 353-363

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See detailOrganized proteomic heterogeneity in colorectal liver metastases and implications for therapies
Turtoi, Andrei ULg; Blomme, Arnaud ULg; Debois, Delphine ULg et al

in Acta Gastro-Enterologica Belgica (2014, March), 77(1), 07

Introduction : Tumor heterogeneity is a major obstacle for developing effective anti-cancer treatments. Recent studies have pointed at large stochastic genetic heterogeneity within cancer lesions, where ... [more ▼]

Introduction : Tumor heterogeneity is a major obstacle for developing effective anti-cancer treatments. Recent studies have pointed at large stochastic genetic heterogeneity within cancer lesions, where no pattern seems to exist that would enable a more structured targeted therapy approach. Aim : Because to date no similar information is available at the protein (phenotype) level, we aimed at characterising the proteomic heterogeneity in human colorectal carcinoma (CRC) liver metastases. Methods & Results : We employed MALDI imaging-guided proteomics and explored the heterogeneity of extracellular distribution of over 1000 proteins we found unexpectedly that all liver metastasis lesions displayed a reproducible, zon- ally delineated, pattern of functional and therapeutic biomarker heterogeneity. Peritumoral region featured elevated lipid metabolism and protein synthesis, the rim of the metastasis displayed increased cellular growth, movement and drug metabolism whereas the center of the lesion was characterized by elevated carbohydrate metabolism and DNA- repair activity. From the aspect of therapeutic targeting zonal expression of known and novel biomarkers was evident, reinforcing the need to select several targets in order to achieve optimal coverage of the lesion. Finally we highlight two novel antigens, LTBP2 and TGFBI, whose expression is a consistent feature of CRC liver metastasis. Conclusions : proteome heterogeneity has a distinct, organized, pattern. This particular hallmark can now be used as a part of the strategy for developing rational therapies based on multiple sets of targetable antigens. [less ▲]

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See detailImatinib improves survival of chronic Graft-versus-host disease by inhibiting TGF-β and PDGF-R in mice
Fransolet, Gilles ULg; Belle, Ludovic ULg; SOMJA, Joan ULg et al

Poster (2014, January)

Introduction: Graft-versus-host disease (GVHD) remains a major complication of allogeneic hematopoietic stem cell transplantation (HSCT). Approximately 15% of the patients develop the sclerodermatous ... [more ▼]

Introduction: Graft-versus-host disease (GVHD) remains a major complication of allogeneic hematopoietic stem cell transplantation (HSCT). Approximately 15% of the patients develop the sclerodermatous cGvHD (scl-cGvHD) form of the disease characterized by multiple organ fibrosis and loss of skin elasticity. A few studies have suggested potential benefits of imatinib, a tyrosine kinase inhibitor, as a treatment of fibrosis in scl-cGVHD due to its ability to inhibit simultaneously the PDGF receptor and TGF-β pathways (via ABL inhibition), which are both involved in fibrosis . Aim: This work investigates the impact of imatinib on fibrosis in the B10.D2 to BALB/cJ scl-cGvHD murine model. Lethally irradiated BALB/cJ recipient mice were injected with 107 bone marrow cells + 7.107 splenocytes from B10.D2 donor mice. Recipients were treated with imatinib 150 mg/kg/day (50 mg/kg in the morning followed by 100 mg/kg in the evening) by oral gavage or the same volume of sterile water. Mice health status was evaluated with a scoring system encompassing five criteria (weight loss, activity, fibrosis, hair loss and mice posture; 0-1-2 points/criteria). Mice were sacrificed at a score of 8/10 according to our local ethical committee. Results: Mice given daily 150 mg/kg imatinib had a better survival than control mice (42 versus 33 days, p = 0,0357). cGvhD scores were suggestively lower in imatinib-treated than in control mice (p ≤ 0,15). Further, histological analyses evidenced reduction in the levels of both PDGF receptor (p = 0,033) and c-Abl (p = 0,185) phosphorylation in imatinib as compared to control mice. Finally, no significant differences were observed in the number or frequency of lymphocyte subsets in the 2 groups of mice. Conclusion: Imatinib slightly decreased fibrosis and significantly improved survival in a severe scl-cGvHD murine model. [less ▲]

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See detailHMGB1 secretion during cervical carcinogenesis promotes the acquisition of a tolerogenic functionality by plasmacytoid dendritic cells
Demoulin, Stéphanie ULg; Herfs, Michael ULg; SOMJA, Joan ULg et al

in International Journal of Cancer = Journal International du Cancer (2014)

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See detailPeripheral T-cell lymphoma with t(6;14)(p25;q11.2) translocation presenting with massive splenomegaly.
SOMJA, Joan ULg; Bisig, B.; de Leval, L. et al

in Virchows Archiv : An International Journal of Pathology (2014)

Recurrent chromosomal translocations associated to peripheral T-cell lymphomas (PTCL) are rare. Here, we report a case of PTCL, not otherwise specified (NOS) with the karyotype 46,Y,add(X)(p22),t(6;14 ... [more ▼]

Recurrent chromosomal translocations associated to peripheral T-cell lymphomas (PTCL) are rare. Here, we report a case of PTCL, not otherwise specified (NOS) with the karyotype 46,Y,add(X)(p22),t(6;14)(p25;q11) and FISH-proved breakpoints in the IRF4 and TCRAD loci, leading to juxtaposition of both genes. A 64-year-old male patient presented with mild cytopenias and massive splenomegaly. Splenectomy showed diffuse red pulp involvement by a pleomorphic medium- to large-cell T-cell lymphoma with a CD2+ CD3+ CD5− CD7− CD4+ CD8+/− CD30− TCRbeta-F1+ immunophenotype, an activated cytotoxic profile, and strong MUM1 expression. The clinical course was marked by disease progression in the bone marrow under treatment and death at 4 months. In contrast with two t(6;14)(p25;q11.2)-positive lymphomas previously reported to be cytotoxic PTCL, NOS with bone marrow and skin involvement, this case was manifested by massive splenomegaly, expanding the clinical spectrum of PTCLs harboring t(6;14)(p25;q11.2) and supporting consideration of this translocation as a marker of biological aggressiveness. [less ▲]

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See detail18F-FDG Uptake Assessed by PET/CT in Abdominal Aortic Aneurysms Is Associated with Cellular and Molecular Alterations Prefacing Wall Deterioration and Rupture.
Courtois, Audrey ULg; Richelle, Betty ULg; Hustinx, Roland ULg et al

in Journal of Nuclear Medicine (The) (2013), 54

Rupture of abdominal aortic aneurysms (AAAs) leads to a significant morbidity and mortality in aging populations, and its prediction would be most beneficial to public health. Spots of positive uptake of ... [more ▼]

Rupture of abdominal aortic aneurysms (AAAs) leads to a significant morbidity and mortality in aging populations, and its prediction would be most beneficial to public health. Spots of positive uptake of 18F-FDG detected by PET are found in 12% of AAA patients (PET+), who are most often symptomatic and at high rupture risk. Comparing the 18F-FDG-positive site with a negative site from the same aneurysm and with samples collected from AAA patients with no 18F-FDG uptake should allow the discrimination of biologic alterations that would help in identifying markers predictive of rupture. METHODS: Biopsies of the AAA wall were obtained from patients with no 18F-FDG uptake (PET0, n = 10) and from PET+ patients (n = 8), both at the site of positive uptake and at a distant negative site of the aneurysmal wall. Samples were analyzed by immunohistochemistry, quantitative real-time polymerase chain reaction, and zymography. RESULTS: The sites of the aneurysmal wall with a positive 18F-FDG uptake were characterized by a strikingly increased number of adventitial inflammatory cells, highly proliferative, and by a drastic reduction of smooth muscle cells (SMCs) in the media as compared with their negative counterpart and with the PET0 wall. The expression of a series of genes involved in the maintenance and remodeling of the wall was significantly modified in the negative sites of PET+, compared with the PET0 wall, suggesting a systemic alteration of the aneurysmal wall. Furthermore, a striking increase of several matrix metalloproteinases (MMPs), notably the MMP1 and MMP13 collagenases, was observed in the positive sites, mainly in the adventitia. Moreover, PET+ patients were characterized by a higher circulating C-reactive protein. CONCLUSION: Positive 18F-FDG uptake in the aneurysmal wall is associated with an active inflammatory process characterized by a dense infiltrate of proliferating leukocytes in the adventitia and an increased circulating C-reactive protein. Moreover, a loss of SMC in the media and alterations of the expression of genes involved in the remodeling of adventitia and collagen degradation potentially participate in the weakening of the aneurysmal wall preceding rupture. [less ▲]

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See detailMosquito net for abdominal wall repair: a comparison of their chemical, physical, morphological and mechanical properties to commercial meshes
Sevrin, Chantal ULg; Nsadi Fwene, Berthier; Arung, Willy et al

in Biomedica proceedings (2013, June 23)

Meshes are the actual standard in abdominal wall repair. Commercial medical meshes are however either unavailable or unaffordable too expensive for developing countries. Therefore in most resource-poor ... [more ▼]

Meshes are the actual standard in abdominal wall repair. Commercial medical meshes are however either unavailable or unaffordable too expensive for developing countries. Therefore in most resource-poor developing countries a traditional sutured repair is still commonplace although with significantly inferior results. Sterilized mosquito nets have been recently roposed by several authors to replace medical meshes in low-income countries . However in the perspective of their clinical use a better understanding of this mosquito net is obviously requested both in terms of material properties and of in vivo biocompatibility. [less ▲]

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See detailINFUSION OF THIRD-PARTY MESENCHYMAL STEM CELLS (MSC) AFTER KIDNEY AND LIVER TRANSPLANTATION: A PHASE I-II, OPEN-LABEL, CLINICAL STUDY (EudraCT 2011-001822-81 & NCT01429038)
DETRY, Olivier ULg; DELBOUILLE, Marie-Hélène ULg; LECHANTEUR, Chantal ULg et al

Poster (2013, May 30)

MSC cells have demonstrated significant immunosuppressive effects in various in vivo and in vitro studies. This study aims to be the first evaluation of the safety and tolerability of third party MSC ... [more ▼]

MSC cells have demonstrated significant immunosuppressive effects in various in vivo and in vitro studies. This study aims to be the first evaluation of the safety and tolerability of third party MSC infusion after cadaveric kidney and liver transplantation in a prospective phase I-II study, taking advantage of our centre expertise and experience in MSC use in graft-versus-host disease (GVHD) after bone marrow transplantation and using an already functioning GMP-compliant laboratory producing clinical-grade MSC. Secondary end-points will help to evaluate the immunosuppressive potential of MSC after organ transplantation, and the opportunity to develop larger randomised, controlled, phase III trials. After successful transplantation, 10 liver and 10 kidney transplant recipients under standard immunosuppression (tacrolimus, MMF, steroids) will receive an intravenous infusion of 1.5-3x106/kg of third-party MSC on post-operative day 3±2. These patients will be prospectively compared to 10 liver and 10 kidney recipients who meet the inclusion criteria but deny MSC infusion. Safety will be assessed by recording side effects, including opportunistic infections and cancers. Immunosuppressive potential will be evaluated by rejection episode rates, by graft/patient survivals, by immunohistology of 3-months kidney and 6-month liver graft biopsies and by in vitro evaluation of the immunity profile of the recipients. In a second step, reduction (kidney) and progressive weaning (liver) of immunosuppression will be attempted in recipients who received MSC. This ongoing study is supported by research grants from the CHU of Liège, University of Liège, and by the Senior Clinical Research Grant from ESOT. The first patients were included and treated in early 2012, and final results expected in late 2013. [less ▲]

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See detailInfusion of CliniMACS (Myltenyi Biotec) Enriched Regulatory T Cells Delays Experimental Xenogeneic Graft-versus-Host Disease
Hannon, Muriel ULg; Lechanteur, C.; Somja, Joan ULg et al

in Belgian Journal of Hematology (2013), Abstracts book(Supplement of 28th General Meeting of the Belgian Hematological Society), 15

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