Breast Neoplasms/genetics; Breast Neoplasms/pathology; Endothelial Cells/metabolism; MicroRNAs/genetics; Neovascularization, Pathologic/genetics; Animals; Bone Marrow Cells/cytology; Bone Marrow Cells/metabolism; Breast Neoplasms/metabolism; Carcinoma in Situ/genetics; Carcinoma in Situ/metabolism; Carcinoma in Situ/pathology; Carcinoma, Ductal, Breast/genetics; Carcinoma, Ductal, Breast/metabolism; Carcinoma, Ductal, Breast/pathology; Carcinoma, Lewis Lung; Cell Differentiation/physiology; Endothelial Cells/cytology; Female; Flow Cytometry; Humans; Immunohistochemistry; In Situ Hybridization; Mice; Mice, Inbred BALB C; Mice, Inbred C57BL; Mice, Transgenic; MicroRNAs/metabolism; Neovascularization, Pathologic/metabolism; Neovascularization, Pathologic/pathology; Polymerase Chain Reaction; Stem Cells/cytology; Stem Cells/metabolism