Figure 2
From: Natural resistance to cancers: a Darwinian hypothesis to explain Peto’s paradox
The network of interactions between cancer and various variables acting on individuals and species in ecosystems. Arrows represent direct (e.g. , oncogenic pathogens cause cancer) or evolutionary (e.g. , predation exert selective pressure on parasite virulence) responses. Arrows are in two colors for clarity (blue for unidirectional relationships, dark for reciprocal, or potentially reciprocal, relationships).