In order to evaluate if co-injection of ASCs induced phenotypic modifications of breast cancer cells, we evaluted the expression of hormonal receptors (ER, PR and Her2) in xenografts origining from breast cancer cells injected alone or in combination with ASCs (Additional file, Figure 4) and compared with expression found in primary tumors as well (Additional file, Table 1). Here, NR4A1 is linked to breast cancer.