Cell viability was assayed in 2D-adherent conditions using 384-well culture plates (Corning, #3570) and ultra-low attachment conditions using PrimeSurface 384-well 3D culture spheroid plates (S-bio, #MS-9384WZ) as previously described.26 (link) In brief, PATU-8988T and PATU-8902 cells were plated at a density of 100 cells per well in 50 μL media and allowed to adhere or form spheroids overnight. Cells were treated with 100 nL of compound from compound stock plates using a Janus Workstation pin tool (PerkinElmer) and incubated for 120 h. Cell viability was measured by addition of 10 μL of CellTiter-glo (Promega), followed by incubation for 15 minutes at room temperature. Luminescence was measured on an EnVision 2104 Multilabel Plate Reader (PerkinElmer). Data was normalized to DMSO-treated wells for each cell line and analyzed using GraphPad PRISM v7.