To elucidate the regulation of PDL1, LDHA and miR-34a in TNBC, this study will explore the function of miR-34a as a tumor suppressor that regulates glycolysis and immunology in TNBC cells by targeting LDHA and PDL1 and examine the mechanism of PDL1 and LDHA as ceRNAs that promote proliferation and metastasis of TNBC by regulating miR-34a. This evidence concerns the gene CD274 and neoplasm.