P383: USING CF-DNA AS STARTING MATERIAL FOR MRD STUDIES BY NGS IMPROVES THE SENSITIVITY OF THE METHOD AGAINST CTCS. (23rd June 2022) - Álvarez Sánchez-Redondo, N.; Dorado, S.; Martín, A.; Rufián, L.; Garrido, V.; Giménez, A.; Moreno, L.; Heredia, Y.; Martínez-López, J.; Barrio, S.; Ayala, R.