| Statement | Evidentiary support | Expert agreement |
| At the single-organism level, the role of microorganisms as aetiological agents in carcinogenesis is well established. | Strong evidence from human studies (10) | Strongly agree (8) |
| There are plausible mechanisms by which the human microbiome may cause cancer. | Evidence from animal studies (8) | Strongly agree (10) |
| There is a causal relationship between the human microbiome and the aetiopathogenesis of some cancers. | Weak evidence from human studies (8) | Agree (10) |
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