S137: SMALL EXTRACELLULAR VESICLES IN THE LEUKEMIA MICROENVIRONMENT SUSTAIN CLL PROGRESSION BY HAMPERING T CELL-MEDIATED ANTI-TUMOR IMMUNITY by E. Gargiulo, E. Viry, P. E. Morande, A. Largeot, S. Gonder, F. Xian, N. Ioannou, M. Benzarti, F. Kleine Borgmann, M. Mittelbronn, G. Dittmar, P. V. Nazarov, J. Meiser, B. Stamatopoulos, A. G. Ramsay, E. Moussay, J. Paggetti

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