In one HNSC (MOC‐L1, a mouse oral carcinoma cell line) and three breast cancer (4T1, E0771, and EMT6) mouse cell lines, MOC‐L1 and 4T1 cells expressed higher mRNA levels of RNase1 than E0771 and EMT6 cells (Figure S3A, Supporting Information). This evidence concerns the gene RNASE1 and breast cancer.