TABLE 1.

Tumor formation in nude mice^a

Type of tumor	No. of tumors/no. of mice
	Ras	Ras-TEL
Total	14/14	15/15
Invasiveb	13/14	±3d/15
Metastaticc	2/14	0/15

^aSingle cell suspensions containing the listed constructs (polyclonal) were injected into a single site in the right flank of 7-week-old female athymic nude mice. Mice were then monitored for tumor formation. 

^bInvasiveness was determined at the time of autopsy by inspection of the tumor and histologic analysis. 

^cMetastatic tumors were found in the lymph nodes. 

^dTumors showing limited invasion.