IL1R2 and breast cancer: Utilizing qRT‐PCR and immunohistochemistry (IHC) assays, we demonstrated that IL1R2 mRNA and protein levels were upregulated in BC cells of the majority of BC tissue samples in comparison to the corresponding paratumor (normal) breast tissue samples (Figure 1E,F), and IL1R2 mRNA overexpression could be also confirmed in BC patient samples from The Cancer Genome Atlas (TCGA) database (Figure S1B, Supporting Information).