Fig. 1From: On-treatment biomarkers can improve prediction of response to neoadjuvant chemotherapy in breast cancerUnsupervised analysis cannot distinguish pre- and on-chemotherapy samples of breast tumours. a Schematic representation demonstrating sequential sampling of breast tumours during treatment. b PCA analysis of pre- and on-treatment samples from the Edinburgh NEO and I-SPY studies revealed no significant clustering of patients by time or response group. Red = non-responder, orange = partial responder, blue = complete responderBack to article page