IL1R2 and cancer: IL1R2‐ and Ki67‐positive cells were decreased in the neutralizing antibody and docetaxel combinational treatment group, and not only staining of BMI1 dramatically decreased, BMI1‐positive cell ratio was also significantly decreased in the combination group (Figure 6J,K; Figure S7G, Supporting Information), which indicated that cancer cell proliferation and self‐renewal potential were inhibited.