1346PReal world cfDNA collection in EGFR-mutant NSCLC. (23rd October 2018) - Marcoux, N; Sequist, L V; Hata, A; Banwait, M; Dagogo-Jack, I; Nagy, R; Lanman, R B; Muzikansky, A; Digumarthy, S R; Piotrowska, Z