Publications by authors named "Thierry Guillaume"

Allogeneic hematopoietic stem cell transplantation (alloHSCT) is a potentially curative treatment for acute myeloid leukemia (AML) and myelodysplastic syndromes (MDS). However, these transplants are complicated by a high rate of relapse in very high cytogenetic risk or refractory diseases. The benefit of this therapeutic strategy for these serious malignant hemopathies could therefore be reassessed.

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Article Synopsis
  • Graft-versus-host disease (GvHD) is a serious problem that can happen after getting a stem cell transplant.
  • Researchers found that a special kind of cells called DP8α Tregs, which help control the immune system, might help prevent GvHD by linking to helpful gut bacteria.
  • The study showed that patients with fewer DP8α Tregs were more likely to develop GvHD, suggesting that boosting these cells could be important for preventing this disease.
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Tasks measuring human creativity overwhelmingly rely on both language comprehension and production. Although most of the world's population is bilingual, few studies have investigated the effects of language of operation on creative output. This is surprising given that fluent bilinguals master inhibitory control, a mechanism also at play in creative idea evaluation.

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The impact of pre-graft COVID-19 vaccinations in donor or recipient as well as pre-graft infection has been studied in 157 adults having received allogeneic stem cell transplantation (Allo-SCT) for various hematological diseases during the delta/omicron waves. We showed here that pre-Allo-SCT COVID-19 vaccination and/or infection do not provide more protection in patients receiving vaccine, immunotherapy or both after transplant. COVID-19 vaccination is and remains of crucial importance after Allo-SCT, reinforcing the recommendation to start COVID-19 vaccination as soon as the third month following the transplant.

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In the alternative uses task (AUT), a well-established creativity assessment, participants propose alternative uses for common items (e.g., a brick) within a 2-3 min timeframe.

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Since the early description of three patients with relapsed leukaemia after allogeneic haematopoietic cell transplantation (HCT) who obtained complete remission after donor lymphocyte infusions (DLIs), the added value of this procedure to induce or maintain graft-versus-leukaemia immunity has been undisputed. For more than 30 years, DLIs have become common practice as prophylactic, pre-emptive, or therapeutic immunotherapy. However, as with many aspects of allogeneic HCT, centres have developed their own routines and practices, and many questions related to the optimal applications and toxicity, or to the immunobiology of DLI induced tumour-immunity, remain.

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Late relapse, beyond 2 years following alloHSCT for AML, is rare. Among the 376 patients allografted for AML in our center between 1990 and 2016, 142 (38%) relapsed. The majority (68%) of relapses occurred during the first year following transplantation.

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Article Synopsis
  • * The only known curative treatment for CEP is allogeneic stem cell transplantation (Allo-SCT), which has mainly been documented in children and not in adults.
  • * This study presents the first successful case of a 46-year-old man cured of CEP with Allo-SCT, showing promising results over a 5-year follow-up period.
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The use of post-transplantation cyclophosphamide (PTCy) for graft-versus-host disease (GVHD) prophylaxis is not established after reduced intensity conditioning (RIC) hematopoietic stem cell transplantation (HSCT) from fully matched donors. This was a randomized, open-label, multicenter, phase 2 trial. All patients received a RIC regimen with fludarabine, intravenous busulfan for 2 days (Flu-Bu2), and a peripheral blood stem cell (PBSC) graft from a matched related or 10/10 HLA-matched unrelated donor.

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  • The presence of donor Vγ9Vδ2 T-cells after haploidentical hematopoietic stem cell transplant (h-HSCT) is linked to better disease-free survival, as these cells can target tumor cells without triggering severe side effects.
  • A clinical study assessed the safety of generating these T-cells by combining zoledronic acid (ZA) with interleukin-2 (IL-2), showing that the procedure is safe and successfully increases T-cell numbers in patients.
  • The study's outcomes suggest potential for further research into using this immunotherapy to reduce relapse rates after h-HSCT, indicating that more extensive trials may come next.
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In this monocentric prospective study, the influence on long-term outcomes of peripheral blood levels of monocytic-myeloid-derived suppressive cells (M-MDSC) was investigated in 56 patients with acute leukemia (myeloid  = 47; lymphoid  = 9) before and after (Days+60/+90) allogeneic hematopoietic stem cell transplantation (Allo-HSCT). A risk of relapse was found to be associated with a level of pregraft M-MDSC above 1.4% by ROC curve analysis.

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Article Synopsis
  • In acute myeloid leukaemia (AML), interleukin-6 (IL-6) is linked to chemotherapy resistance and worse patient outcomes, prompting researchers to explore tocilizumab, an anti-IL-6 receptor monoclonal antibody, as a potential treatment in combination with standard chemotherapy.
  • A phase 1 trial at Nantes University Hospital tested three escalating doses of tocilizumab in adults with newly diagnosed or relapsed AML, aiming to determine the maximum tolerated dose (MTD) while monitoring safety and treatment responses.
  • Of the 12 patients treated, no significant toxicities related to tocilizumab were observed, nine out of ten evaluable patients had a positive response to the treatment, indicating
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Speakers of Mandarin Chinese are thought to conceptualise time along the vertical axis-as evidence for metaphor embodiment-but the extant behavioural evidence remains unclear. Here, we used electrophysiology to test space-time conceptual relationships implicitly in native speakers of Chinese. We employed a modified arrow flanker task, in which the central arrow in a set of three was replaced by a spatial word (e.

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It is now well established that reading words in a second language (L2) automatically activates native language (L1) translations in bilinguals. Although there is evidence that access to such representations is inhibited when words have a negative emotional valence, the mechanism underlying such inhibition is elusive, and it is unknown whether inhibition arises online as L2 is being processed or whether negative valence affects subsequent L1 processing. Here, we recorded event-related brain potentials in Chinese-English bilinguals engaged in an implicit translation-priming paradigm involving L2 (English) word pairs.

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Background: Post-transplant cyclophosphamide (PTCY) alone as graft-versus-host disease (GVHD) prophylaxis may avoid/reduce short- and mid-term toxicities of drugs commonly used for GVHD prophylaxis, accelerate immune reconstitution after the graft to decrease infections and facilitate the early integration of adjunct maintenance therapies to prevent relapse.

Objective: A prospective phase 2 study was designed in order to assess the feasibility and safety of PTCY as a sole GVHD prophylaxis in adult patients receiving a Baltimore-based reduced-intensity conditioning (RIC) peripheral blood (PB) allogeneic hematopoietic stem cell transplantation (Allo-HSCT) with a matched donor.

Study Design: Patients were planned to be included stepwise up to 59 evaluable PTCY recipients, in order to be able to stop the protocol in case of excessive corticosteroid resistant grade 3-4 severe acute GVHD (aGVHD).

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The Francophone Society of Bone Marrow Transplantation and Cellular Therapy (SFGM-TC) held the 13th edition of the Clinical Practices Harmonization Workshops. Our workgroup reviewed the current data on the incidence, screening methods and international guidelines for the prevention of secondary solid cancers following allogeneic hematopoietic stem cell transplantation. The purpose of this workshop was to provide recommendations for the screening and prevention of secondary malignancies to Francophone transplantation centers.

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Background: Therapeutic options for CD19 relapses after anti-CD19 CAR-T cells are still debated; second infusion of anti-CD19 CAR-T cells, therapeutic antibodies, or targeted therapies can be discussed. Here, we explore the immunophenotyping and lysis sensitivity of CD19 ALL relapse after anti-CD19 CAR-T cells and propose different therapeutic options for such a high-risk disease.

Methods: Cells from successive B-ALL relapses from one patient were collected.

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Previous research has shown that positive and negative moods differently modulate lexico-semantic processes. However, little is known about effects of mood on creative meaning comprehension in bilinguals. Here, Polish-English (L1-L2) female bilinguals made meaningfulness judgments on L1 and L2 novel metaphoric, literal, and anomalous sentences during an EEG session featuring positive and negative mood induction.

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A full exploration of immune responses is deserved after anti-SARS-CoV-2 vaccination and boosters, especially in the context of allogeneic hematopoietic stem cell transplantation (allo-HSCT). Although several reports indicate successful humoral responses in such patients, the literature is scarce on cellular specific immunity. Here, both B- (antibodies) and T-cell responses were explored after one (V3 = 40) or two (V4 = 12) BNT162b2 mRNA vaccine boosters in 52 allo-HSCT recipients at a median of 755 days post-transplant (<1 year = 9).

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Myeloid Derived Suppressive Cells (MDSC) are capable to suppress innate and adaptive immune responses, thus favouring solid cancer progression. However, little is known about the role of MDSC in acute myeloid leukaemia (AML). In this monocentric prospective study, 73 adult AML patients, eligible for first-line intensive chemotherapy, were included with the aim to study the influence on long-term outcomes of peripheral blood (PB) levels of monocytic (M) MDSC (M-MDSC) assessed by flow cytometry.

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Article Synopsis
  • Allogeneic hematopoietic stem cell transplantation (Allo-HSCT) can fail due to disease relapse in patients with high-risk myeloid malignancies, with CD34 cells in bone marrow possibly being either malignant recipient cells or donor cells signaling recovery.
  • A study of 261 Allo-HSCT recipients analyzed donor/recipient chimerism in BM CD34 sorted cells, finding that thresholds of 98% donor cells in peripheral blood and 90% in BM-CD34SC could predict relapse.
  • Machine learning was used to confirm that mixed chimerism in BM-CD34SC is a strong predictor of relapse, significantly affecting disease-free and overall survival, highlighting its potential for guiding preemptive treatment strategies
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The occurrence of a secondary hemophagocytic lymphohistiocytosis/macrophage activation syndrome (HLH/MAS) after CAR T-cell infusion is very rare and mostly fatal. Treatment recommendations for such a complication are not yet established. Here, we report the dramatic recovery of HLH/MAS following tisagenlecleucel infusion in a young patient with relapsed acute lymphoblastic leukemia using etoposide phosphate (EP).

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