Figure 4.
A: four regions of “sneaking through”, and B: no sneaking-through when eliminating suppressor T cells, plots drawn from data in (Gatenby, Basten, and Creswick 1981). Very low zone (less than 100 cells): low tumor incidence; low zone (102 – 103 cells): tolerance of tumor; moderate zone (103 – 105 cells): immunogenic (low tumor); high zone (> 106): again tolerogenic. C: Another illustration of the same general idea of four regions. Plot drawn from data in (Kolsch and Mengersen 1976). The x axis in these plots case measures the initial number of tumor cells, and not the rate of growth λ of tumor as it did as in Figure 3. In both cases, the y-axis measures the percentages of mice in which tumors were detected by some predetermined point. Supplemental Section G discusses experiments in more detail.