Table 1. Invasion – metastasis cascade for Balb/c tumor-derived breast cancer cell lines.

Cell line	Invasion - Metastasis cascade	Metastatic site
67NR	Primary tumor formation only	N/A
168FARN	Primary tumor + local invasion + intravasation	Lymph nodes
4T07	+ Extravasation	Micrometastases in lung, lymph nodes
4T1	+ Metastatic growth	Lung, Liver, Bone