P995: MYELOID NEOPLASMS-ASSOCIATED GENE VARIANTS IN 639 PATIENTS WITH POST-POLYCYTHEMIA VERA AND POST-ESSENTIAL THROMBOCYTHEMIA MYELOFIBROSIS: AN ANALYSIS OF THE MYSEC COHORT. (23rd June 2022) - Mora, B.; Guglielmelli, P.; Kuykendall, A.; Maffioli, M.; Rotunno, G.; Komrokji, R. S.; Palandri, F.; Kiladjian, J.-J.; Iurlo, A.; Auteri, G.; Cattaneo, D.; De Stefano, V.; et al.