PB1917: PROGNOSTIC AND PREDICTIVE SIGNIFICANCE OF ELEMENTS OF THE ADAPTIVE IMMUNITY IN THE MICROENVIRONMENT OF MYELODYSPLASTIC SYNDROMES TREATED WITH 5-AZACITIDINE. (23rd June 2022) - Tsakiraki, Z.; Papageorgiou, S.; Spathis, A.; Pouliakis, A.; Bouchla, A.; Thomopoulos, T.; Panayiotides, I. G.; Pappa, V.; Foukas, P.