PCAT19 and breast cancer: To validate the OS‐associated lncRNAs, we searched the bc‐GenExMiner database,17 which contains 4421 BC patients' RNA‐seq profiles and found that PCAT19 was a protective prognosis factor of BC as a whole cohort (p‐value for DFS = 0.039, p‐value for OS = 0.045) as well as in luminal A/B subtypes (Figure 1F, Figure S1).