Table 4.

Overview over the experiments evaluating the tumorigenicity of the MCF7-wt and MCF7-si cells.

Experiment	Hormone Pellets	Matrigel	MCF-wt	MCF-si
1	-	-	0/10	0/8
2	+	-	0/8	1/8
3	-	+	0/10	0/10
4	+	+	4/8	9/10

The number of tumors that had developed under control conditions (Exp. 1), upon the implantation of estrogen-containing hormone pellets (Exp. 2), upon the use of Matrigel (Exp. 3), and upon the combined implementation of estrogen-containing hormone pellets and Matrigel (Exp. 4) are presented.