P1041: IMPACT OF FEDRATINIB ON SPLEEN VOLUME AND MYELOFIBROSIS SYMPTOMS IN PATIENTS WITH SUBSTANTIAL SPLENOMEGALY: POST HOC ANALYSES FROM THE JAKARTA AND JAKARTA2 TRIALS. (23rd June 2022) - Kiladjian, J.-J.; Tefferi, A.; Passamonti, F.; Vannucchi, A.; Talpaz, M.; Cervantes, F.; Harrison, C. N.; Mesa, R. A.; Mascarenhas, J.; Schaap, N.; Verstovsek, S.; Devos, T.; et al.