CXCL9 and neoplasm: While consistent with data from MCF‐7, the expression level of genes related to anti‐tumor immunity such as T‐cell chemokines (CXCL9, CXCL10, and CXCL11) and antigen presentation (HLAs and B2M) in CDK4/6i‐induced senescent cells is similar or even higher than those of DNA‐damaging agent‐induced senescent cells (Fig. S3G), consistent with the mRNA data, in HCC1428, CXCL10 and IFN‐λ protein level in the conditioned medium derived from CDK4/6i‐induced senescence was also higher than those of DNA‐damaging agent‐induced senescence (Fig. S3H).