Finally, our atlas-wide survival analysis of cell type subpopulations based on bulk data from both TCGA and METABRIC (Supp Table 4) revealed both known associations, such as decreased mortality risk associated with increased CD8 memory T cell activity and low-grade cancer epithelial cells, as well as novel associations, such as increased mortality risk associated with increased proliferative stromal cells (Strom Prolif.), which could be prognostic in BC. The gene discussed is CD8A; the disease is breast cancer.