A Acquire ovarian cancer cell lines from various repository ATCC (6), CRT (2), DSMZ (2), ECACC (7), Kyoto U (24), RIKEN (1) Cell line expansion & banking SGOCL (43) Downstream Analysis Immunofluorescence Staining DNA, RNA, Protein Extraction B RNA Gene Expression Profiling Phenotype-specific Gene Signatures EMT RT 2 Profiler qPCR Array Phenotype-specific Gene Expression Affymetrix GeneChip Human Gene 1.0 ST Array QA Agilent Bioanalyzer Parametric / Nonparametric Analysis Cell Functional Assays Migration Assay Invasion Assay Anoikis Assay Colony Assay Endpoint Readout Image Analysis Establish EM Phenotypic Characterisation Validate EMT Marker Expression Create EMT Spectrum Functional Correlation Supplementary Figure 1

Supplementary Figure 2

Supplementary Figure 3 A Caov3OVCAR-3PEO1OVCAR8 OVCA433IGROV1PEO4OVCA429 CH1SKOV3DOV13Hey C2 A2780Hey A8A1847TykNu B Caov3 IGROV1OVCA433OVCA429 CH1DOV13SKOV3Hey C2 A1847 PEO1OVCAR3OVCAR8 A2780Hey A8TykNu MigrationInvasion C D E OVCA433 HeyC2 Epithelial Intermediate E Intermediate M Mesenchymal Invasive Front F SKOV3 subcutaneous tumours Day 59 SKOV3 subcutaneous tumour. Measurements in centimeters (cm)

Control100 nM 5  M AZD0530 OVCAR3 (E) 500 nM AZD0530 OVCA433 (Int E) AZD0530 SKOV3 (Int M) AZD0530 OVCAR10 (M) Supplementary Figure 4

Supplementary Figure 5 A B

Supplementary Figure 6 A B

Supplementary Figure 7 1-yr PFS2-yr PFS 3-yr PFS4-yr PFSA B Phenotype Comparison Progression-free Survival (PFS) p-value (Log-rank) 1-yr2-yr3-yr4-yr E vs IE E vs IM E vs M IE vs IM IE vs M IM vs M C Phenotype Comparison Difference in RMST (95% CI) 12 month24 month36 month48 month E vs IE0.468 ( )0.979 ( )0.034 ( )-1.96 ( ) E vs IM0.487 ( )2.311 ( )3.362 ( )4.173 ( ) E vs M1.011 ( )4.155 ( )5.919 ( )6.542 ( ) IE vs IM0.019 ( )1.332 ( )3.328 ( )6.133 ( ) IE vs M0.543 ( )3.176 ( )5.885 ( )8.502 ( ) IM vs M0.524 ( )1.844 ( )2.557 ( )2.369 ( )

Supplementary Figure 8 E-cad/DAPI N-Cad/DAPI