SMART: A Spatio-Molecular Atlas of Response Trajectories in Triple-Negative Breast Cancer
Wall, I.; Baptista, A.; Parsons, M.; Grigoriadis, A.; Quist, J.; Rafique, H.; Verghese, G.; Li, M.; Marcotti, S.; Phillips, T. A.; Owczarek, C.; Booker, G.; Mera, A.; Timbres, J.; Sawyer, E.; Gillet, C.; Irshad, S.; Pinder, S.; Clausen, S.; Tramm, T.; King's Health Partners Biobank, ; Ryan, L.
Show abstract
A major challenge in treating Triple-Negative Breast Cancer (TNBC) lies in its molecular, morphological and clinical heterogeneity, which hampers accurate prediction of responses to neoadjuvant treatment. To address this, we introduce SMART: Spatio-Molecular Atlas of Response Trajectories, a comprehensive, multimodal resource compiled from 129 TNBC samples across 89 patients, obtained before, during, and after neoadjuvant chemotherapy (NACT). SMART comprises of 5,096 high quality manually selected spatial transcriptomic profiles enriched for epithelial, immune, or stromal compartments; paralleled with histological annotations, imagebased network analysis and protein expression. Seven novel spatial epithelial archetypes (EAs), seven tumour-immune microenvironments (TIMEs) and their co-localisation patterns were defined, revealing an opposing prevalence of functionally divergent EAs between response groups and the prognostic significance of B-cell enriched TIMEs, in particular those surrounding histologically normal epithelium adjacent to the tumour. The SMART dataset and analytical tools are publicly available via the PharosAI platform, providing the research community with the most comprehensive, manually annotated spatio-molecular transcriptomics atlas of NACT-treated TNBC to date.
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