Figure 1.

Weight of the Lewis lung tumor at different body sites. Lewis lung tumor cells were injected subcutaneously into the ear, back and footpad at a cell density of 2 × 10⁷/ml, using a 25 µl cell suspension at each site. 10 days after tumor growth, the tumors were taken out and weighed individually. Average tumor weight was obtained. Weight of the ear tumor was larger than that in the back or foot. A significant difference was found between the tumor in the ear and the footpad. *p < 0.05 ear tumor vs. footpad tumor.