In TCGA’s dataset, the transcription levels of MMP1 in different types of breast cancer were higher than normal tissues, including invasive ductal breast carcinoma (IDBC) with fold change = 11.254, invasive lobular breast carcinoma (ILBC) with fold change =3.972, mixed lobular and ductal breast carcinoma (MLDBC) with fold change = 3.278, and male breast carcinoma (MBC) with fold change = 9.752. This evidence concerns the gene MMP1 and male breast carcinoma.