P1639: UTILITY OF NEXT GENERATION SEQUENCING TECHNIQUES TO EVALUATE POSSIBLE CAUSES OF REFRACTORINESS TO TREATMENT WITH ELTROMBOPAG IN ADULT PATIENTS WITH PRIMARY IMMUNE THROMBOCYTOPENIA (ITP) IN SPAIN. (23rd June 2022) - Gonzalez-Lopez, T. J.; Sanchez, R.; Pastoriza, C.; Sanchez Gonzalez, B.; Olivera, P.; Bernat, S.; Fernandez-Fuertes, F.; Caparrós Miranda, I.; Mingot, E.; Pérez-Rus, G.; Jarque, I.; Moreno Beltrán, M. E.; et al.