Figure 1. Data processing and identification of differentially expressed miRNAs. (A) Data processing results after normalization of GSE39567, GSE59247, and GSE75669; (B) Heat map showing differentially expressed miRNAs in ductal carcinoma in situ (DCIS) and invasive ductal carcinoma (IDC) samples of GSE39567, GSE59247, and GSE75669; Red and green indicated the high and lower expression, respectively. (C) Venn diagram. The overlapped differentially expressed miRNAs between different datasets were analyzed.