Comparaison phenotypique des cellules natural killer et autres sous populations lymphocytaires entre la moelle oseuse et le sang dans les gammapathies monoclonales

AIX-MARSEILLE2-BU Pharmacie (130552105) / SudocSudocFranceF

Cellules natural killer et leucémie lymphoïde chronique

AIX-MARSEILLE2-BU Pharmacie (130552105) / SudocSudocFranceF

Proliférations réactionnelles à grands lymphocytes granuleux

AIX-MARSEILLE2-BU Méd/Odontol. (130552103) / SudocPARIS-BIUM (751062103) / SudocSudocFranceF

Cellules immunorégulatrices et cellules effectrices dans la polyglobulie de Vaquez

AIX-MARSEILLE2-BU Pharmacie (130552105) / SudocSudocFranceF

Utilisation de l'EPO [Erythropoïétine] (analyse des pratiques en centre hospitalier général en 2004)

AIX-MARSEILLE2-BU Méd/Odontol. (130552103) / SudocPARIS-BIUM (751062103) / SudocSudocFranceF

HEMOPATHIES MALIGNES ET CANCERS SOLIDES NON CLASSANTS CHEZ LES SUJETS INFECTES PAR LE VIH (A PROPOS DE 49 CAS PRIS EN CHARGE A L'INSTITUT PAOLI-CALMETTES ENTRE 1985 ET 1998 (DES ONCOLOGIE MEDICALE))

AIX-MARSEILLE2-BU Méd/Odontol. (130552103) / SudocPARIS-BIUM (751062103) / SudocSudocFranceF

Immunité innée des patients infectés par le virus de l'immunodéficience humaine et atteints de lymphome

AIX-MARSEILLE2-BU Pharmacie (130552105) / SudocSudocFranceF

Is R-CHOP Therapy a Lymphoma Growth Factor?

International audienceThis article describes the first reported case of dramatic lymphocytosis flare after initiation of R-CHOP (rituximab, cyclophosphamide, doxorubicin, vincristine, and prednisone) therapy for an indolent lymphoma. The study patient exhibited a marginal zone lymphoma with mild nodal involvement but packed infiltration of the bone marrow. After initiation of RCHOP therapy, lymphocyte count increased from 329 to 707 x 10(9)/L at day 7. Patient exhibited grade III infusion-related side effect during rituximab therapy. Lymphocyte flare was not accompanied with other clinical manifestation such as lymph node enlargement. Because patient's bone marrow aspirate showed a packed infiltration, it was hypothesized that lymphocytosis flare was a link to lymphocyte release from bone marrow and lymphocyte demargination. This report highlights the necessity to be vigilant after initiation of RCHOP therapy for lymphoma when pathologist notified a pack infiltration of the bone marrow

Impact of Next-Generation Sequencing in Diagnosis, Prognosis and Therapeutic Management of Acute Myeloid Leukemia/Myelodysplastic Neoplasms

International audienceFor decades, the diagnosis, prognosis and thus, the treatment of acute myeloblastic leukemias and myelodysplastic neoplasms has been mainly based on morphological aspects, as evidenced by the French-American-British classification. The morphological aspects correspond quite well, in a certain number of particular cases, to particular evolutionary properties, such as acute myelomonoblastic leukemias with eosinophils or acute promyelocytic leukemias. Advances in biology, particularly “classical” cytogenetics (karyotype) and molecular cytogenetics (in situ hybridization), have made it possible to associate certain morphological features with particular molecular abnormalities, such as the pericentric inversion of chromosome 16 and translocation t(15;17) in the two preceding examples. Polymerase chain reaction techniques have made it possible to go further in these analyses by associating these karyotype abnormalities with their molecular causes, CBFbeta fusion with MYH11 and PML-RAR fusion in the previous cases. In these two examples, the molecular abnormality allows us to better define the pathophysiology of leukemia, to adapt certain treatments (all-transretinoic acid, for example), and to follow up the residual disease of strong prognostic value beyond the simple threshold of less than 5% of marrow blasts, signaling the complete remission. However, the new sequencing techniques of the next generation open up broader perspectives by being able to analyze several dozens of molecular abnormalities, improving all levels of management, from diagnosis to prognosis and treatment, even if it means that morphological aspects are increasingly relegated to the background

The contribution of single-cell analysis of acute leukemia in the therapeutic strategy

International audienceAfter decades during which the treatment of acute myeloblastic leukemia was limited to variations around a skeleton of cytarabine/anthracycline, targeted therapies appeared. These therapies, first based on monoclonal antibodies, also rely on specific inhibitors of various molecular abnormalities. A significant but modest prognosis improvement has been observed thanks to these new treatments that are limited by a high rate of relapse, due to the intrinsic chemo and immune-resistance of leukemia stem cell, together with the acquisition of these resistances by clonal evolution. Relapses are also influenced by the equilibrium between the pro or anti-tumor signals from the bone marrow stromal microenvironment and immune effectors. What should be the place of the targeted therapeutic options in light of the tumor heterogeneity inherent to leukemia and the clonal drift of which this type of tumor is capable? Novel approaches by single cell analysis and next generation sequencing precisely define clonal heterogeneity and evolution, leading to a personalized and time variable adapted treatment. Indeed, the evolution of leukemia, either spontaneous or under therapy selection pressure, is a very complex phenomenon. The model of linear evolution is to be forgotten because single cell analysis of samples at diagnosis and at relapse show that tumor escape to therapy occurs from ancestral as well as terminal clones. The determination by the single cell technique of the trajectories of the different tumor sub-populations allows the identification of clones that accumulate factors of resistance to chemo/immunotherapy ("pan-resistant clones"), making possible to choose the combinatorial agents most likely to eradicate these cells. In addition, the single cell technique identifies the nature of each cell and can analyze, on the same sample, both the tumor cells and their environment. It is thus possible to evaluate the populations of immune effectors (T-lymphocytes, natural killer cells) for the leukemia stressinduced alteration of their functions. Finally, the single cells techniques are an invaluable tool for evaluation of the measurable residual disease since not only able to quantify but also to determine the most appropriate treatment according to the sensitivity profile to immuno-chemotherapy of remaining leukemic cells