To explore the relative gene expression of PI3K/mTOR-associated genes in BC subtypes, we analyzed the publicly available single-cell (sc) RNA-seq dataset from Single Cell Expression Atlas (https://www.ebi.ac.uk/gxa/sc/home) (accessed on 7 December 2020) containing 515 cells from 11 BC patients representing the four subtypes (Figure 6). The gene discussed is MTOR; the disease is breast cancer.