Additionally, in these ten highly cited papers, two studies from 2013 uncovered key factors in the bone marrow microenvironment that influence breast cancer cell dormancy (TGFβ2 signaling in the bone marrow microenvironment can induce dormancy in DTCs [26], and factors deposited in endothelial cells and in their surroundings may be involved in tumor dormancy [33]). This evidence concerns the gene TGFB2 and breast carcinoma.