1338PTracking VSV-IFNβ-NIS oncolytic virus (OV) activity in patients (pts) with advanced solid tumors: The iodide symporter gene (NIS) as a pharmacodynamic (PD) marker using SPECT/CT imaging of OV therapy. (23rd October 2018) - Merchan, J; Patel, M R; Powell, S F; Strauss, J; Cripe, T P; Old, M O; Diaz, R M; Russell, S J; Bexon, A S; Suksanpaisan, L; O'Connor, M K; Peng, K W