Analysis of the TCGA database uncovered that elevated STK33 expression was associated with poor prognosis of patients with TNBC patients (Figure2A), and tissue microarray data from the human protein atlas database showed that the STK33 expression was higher in breast cancer tissue as compared to normal breast tissue (Figure S2A, Supporting Information), and was markedly increased in TNBC tumors compared to levels in non‐TNBC tumors (Figure S2B, Supporting Information). This evidence concerns the gene STK33 and breast cancer.