Time filter

Source Type

Le Gouill S.,University of Nantes | Le Gouill S.,Center dInvestigation Clinique en Cancerologie 2C | Kroger N.,University of Hamburg | Dhedin N.,Hopital de la Pitie Salpetriere | And 17 more authors.
Annals of Oncology | Year: 2012

Background: Despite therapeutic approach that combines rituximab-containing chemotherapy, followed or not by autologous stem cell transplantation (auto-SCT), mantle cell lymphoma (MCL) patients experience relapses. Reduced-intensity conditioning allogeneic stem cell transplantation (RIC-allo-SCT) at time of relapse may represent an attractive strategy. Patients and methods: We report a multicenter retrospective analysis. Seventy MCL patients underwent RIC-allo-SCT in 12 centers. Results: Median age at transplantation was 56 years and median time from diagnosis to transplantation was 44 months. The median number of previous therapies was 2 (range, 1-5) including autologous transplantation in 47 cases. At time of transplantation, 35 patients were in complete remission, 20 were in partial response and 15 in stable disease or progressive disease. The median follow-up for living patients was 24 months. The 2-year event-free survival (EFS) and overall survival (OS) rates were 50% and 53%, respectively. The 1- and 2-year transplant-related mortality rates were 22% and 32%, respectively. The statistical analysis demonstrated that disease status at transplantation was the only parameter influencing EFS and OS. Conclusions: These results suggest that RIC-allo-SCT may be an effective therapy in MCL patients with a chemo-sensitive disease at time of transplantation, irrespective of the number of lines of prior therapy. Studies are warranted to investigate the best type of RIC regimen. © The Author 2012. Published by Oxford University Press on behalf of the European Society for Medical Oncology. All rights reserved. Source

Frikeche J.,French Institute of Health and Medical Research | Frikeche J.,University of Nantes | Clavert A.,French Institute of Health and Medical Research | Clavert A.,University of Nantes | And 11 more authors.
Experimental Hematology | Year: 2011

Recent evidence suggested that 5-azacytidine (5-aza) can impact important immune functions via epigenetic modifications, making it an attractive candidate for pharmacologic manipulation of the immune system. The aim of this work was to study the effects of 5-aza on human dendritic cells (DC) generated from peripheral blood monocytes, and to test the type of immune response induced in patients treated with 5-aza. On the phenotypic level, CD40 and CD86 expression was significantly increased on mature DC exposed to 5-aza (5-aza-DC), compared with control untreated DC. Mature control DC and mature 5-aza-DC secreted comparable amounts of interleukin (IL)-6, IL-12p70, IL-23, and tumor necrosis factor-α. However, mature 5-aza-DC secreted significantly lower levels of IL-10 and IL-27 compared to mature control DC (p = 0.04 and p = 0.005, respectively). In the peripheral blood of 14 patients (7 males and 7 females; age range, 53-81 years) with advanced myeloid malignancies (8 acute myeloid leukemia and 6 myelodysplastic syndrome) treated with 5-aza, there was a significant decrease of IL-4-secreting CD4 + T cells (p = 0.001), and a significant increase of IL-17A- and IL-21-secreting CD4 + T cells (p = 0.003 and p = 0.01, respectively, compared to 5 healthy donors) suggesting a Th17 response pattern in the blood of patients receiving 5-aza. In all, these data suggest potentially novel mechanisms of action of epigenetic therapies, such as 5-aza, which may have broader implications for immunotherapeutic strategies. © 2011 ISEH - Society for Hematology and Stem Cells. Source

Malard F.,French Institute of Health and Medical Research | Malard F.,University of Nantes | Bossard C.,University of Nantes | Bossard C.,Nantes University Hospital Center | And 17 more authors.
Bone Marrow Transplantation | Year: 2014

The contribution of Th17 cells to chronic GVHD (cGVHD) has been demonstrated in cGVHD mouse models. However, their contribution to human liver cGVHD remains unclear. We evaluated Th17 cells in biopsies from a cohort of 17 patients with liver cGVHD. We observed a significant increase in Th17 cells in the liver of patients with cGVHD, as demonstrated by an increase in CCR6+, CD161+ and RORγt+ T cells (P=0.03, P=0.0001 and P=0.03, respectively). We also assessed the presence of Th1 and regulatory (Treg) T cells: the numbers of Th1 and Treg cells were very low, with no difference between the two groups (P=0.88 and P=0.12, respectively). Furthermore, Th17/Th1 and Th17/Treg ratios were significantly increased in the liver of patients with liver cGVHD (P=0.005 and P=0.002, respectively). This study provides evidence for an infiltration by Th17 cells in the liver of patients with cGVHD and an increased Th17/Treg ratio, suggesting a defect in the regulatory mechanism driven by Treg cells or an inappropriate activation of effectors cells, especially Th17 cells, or both mechanisms, in human liver cGVHD. © 2014 Macmillan Publishers Limited. Source

Gaugler B.,French Institute of Health and Medical Research | Gaugler B.,University of Franche Comte | Arbez J.,French Institute of Health and Medical Research | Arbez J.,University of Franche Comte | And 10 more authors.
Cytotherapy | Year: 2013

Background aims: This study aimed to characterize the immune effectors contained in apheresis samples obtained from patients with grafts mobilized with plerixafor and granulocyte colony-stimulating factor (G-CSF) (P+G) compared with grafts mobilized with G-CSF alone (G). Methods: Aliquots of apheresis samples were obtained from 36 patients with malignant diseases after mobilization with G (n = 18) or P+G (n = 18). The phenotype and cytokine secretion profile of T cell and dendritic cell subsets were characterized by multicolor cytometry including intracellular cytokine staining. Results: In grafts collected after mobilization with P+G, there was a significantly higher percentage of CD3+ T cells compared with samples collected after mobilization with G alone. On a functional level, a significant increase of interferon-γ and tumor necrosis factor-α secreting CD8+ T cells was observed in the P+G group compared with the G group. CD4 +Foxp3+ regulatory T cells were similar in both groups but exhibited a lower expression of inducible costimulatory molecule and a significantly higher expression of CD127 in the P+G group. Myeloid dendritic cells (MDCs) and BDCA3+ dendritic cells were similar in both groups. In contrast, plasmacytoid dendritic cells (PDCs) (CD123+BDCA2 +HLA-DR+) were significantly increased in the P+G grafts, leading to a higher PDC-to-MDC ratio. PDCs mobilized by P+G displayed different functional markers - a higher percentage of ILT7+ PDCs and decreased expression of CD86 - suggesting a potential regulatory capacity of PDCs mobilized by P+G. Conclusions: Grafts mobilized with P+G exhibited major different functional features compared with grafts mobilized with G alone, suggesting that such grafts may have an impact on patient outcome after autologous stem cell transplantation. Copyright © 2013, International Society for Cellular Therapy. Published by Elsevier Inc. All rights reserved. Source

Oudin C.,Institute Paoli Calmettes | Oudin C.,Aix - Marseille University | Chevallier P.,University of Nantes | Furst S.,Institute Paoli Calmettes | And 20 more authors.
Haematologica | Year: 2014

The introduction of reduced intensity/toxicity conditioning regimens has allowed allogeneic hematopoietic cell transplantation to be performed in patients who were previously considered too old or otherwise unfit. Although it led to a reduction in non-relapse mortality, disease control remains a major challenge. We studied the outcome of 165 patients with acute myeloid leukemia (n=124) or myelodysplastic syndrome (n=41) transplanted after conditioning with fludarabine (30 mg/m2/day for 5 days), intravenous busulfan (either 260 mg/m2: reduced intensity conditioning, or 390-520 mg/m2: reduced toxicity conditioning), and rabbit anti-thymoglobulin (2.5 mg/kg/day for2 days). The median age of the patients at transplantation was 56.8 years. The 2-year relapse incidence was 29% (23% versus 39% for patients transplanted in first complete remission and those transplanted beyond first complete remission, respectively; P=0.008). The 2-year progression-free survival rate was 57% (95% CI: 49.9-65). It was higher in the groups with favorable or intermediate cytogenetics than in the group with unfavorable cytogenetics (72.7%, 60.5%, and 45.7%, respectively; P=0.03). The cumulative incidence of grades 2-4 and 3-4 acute graft-versus-host disease at day 100 was 19.3% and 7.9%, respectively. The cumulative incidence of chronic graft-versushost disease at 1 year was 21.6% (severe forms: 7.8%). Non-relapse mortality at 1 year reached 11%. The 2-year overall survival rate was 61.8% (95% CI: 54.8-69.7). Unfavorable karyotype and disease status beyond first complete remission were associated with a poorer survival. This well-tolerated conditioning platform can lead to longterm disease control and offers possibilities of modulation according to disease stage or further development. © 2014 Ferrata Storti Foundation. Source

Discover hidden collaborations