P692: IMMUNE FACTORS MAINTAINING TREATMENT-FREE REMISSION IN PATIENTS WITH CHRONIC MYELOID LEUKEMIA AFTER DISCONTINUATION OF IMATINIB. (23rd June 2022) - Kwaśnik, P.; Zaleska, J.; Link-Lenczowska, D.; Zawada, M.; Ochrem, B.; Bober, G.; Wasilewska, E.; Mędraś, E.; Hus, I.; Szarejko, M.; Prejzner, W.; Grzybowska-Izydorczyk, O.; et al.