The threshold for tumor clearance without anti-PD-1 is β = 4.9 × 10−8, whereas with anti-PD-1, tumor clearance occurs for all β ≥ 2.5 × 10−8, and 5 × 10−10 < β < 3.2 × 10−9 will likely also lead to tumor clearance. Here, PDCD1 is linked to neoplasm.