Source
Aktipis et al. (2015), LIT-740, read in NOTE-562.
What was actually shown
Aktipis and colleagues review the literature in LIT-740; they classify reports and add no data.
- The framework. Effective multicellularity “requires not just cooperation among cells but also mechanisms for suppressing conflict that results from mutations that can enhance cell-level fitness at the expense of the organism”. Five kinds of cooperation are named, and their breakdown gives the phenotypes of cancer.
- The survey. Complex multicellularity evolved independently at least seven times, so cheater suppression did too. Cancer-like phenomena, broadly defined, are reported across these lineages, with gaps the authors attribute partly to lack of study. Cheating on division of labour appears in all forms of multicellularity; resource and environment cheating only in animals and plants so far.
- The interpretation. “Complex multicellularity represents a highly sophisticated cheater detection and suppression system”, with mechanisms inside cells, in tissue architecture and across the body. Larger bodies likely need more of it.
What this does not say
- Not that cheating is a strategy. It is a functional description of a breakdown, not a claim that cells evolved to defect.
- Not that clonality is required. Development from one cell reduces conflict, but aggregative biofilms also cooperate at scale.
- Not that animals are uniquely prone. They appear so, “although we cannot completely eliminate the possibility that this conclusion is influenced by sampling bias”.
- Not a model of multilevel selection. It is invoked by citation; the idea that proliferative units are an intermediate level of selection is offered as a possibility.
Connections
- Okasha (THEORY-141). The general principle of the major transitions, that higher-level selection must come to trump selection among the units, typically through policing, is what this account documents at one transition. Okasha also cautions against assuming that every transition turns on a collective action problem; this account assumes it for multicellularity and supports it with phenotypes, not with measured fitness conflicts.
- The owner’s essay. §6.3’s capture from below has its biological case here: units gaining at the collective’s expense, and a collective that persists by detecting and suppressing them. The paper’s remark that cancer is also “a matter of being in an environment that has poor cheater detection and suppression” puts part of the failure in the collective, not only in the defecting units.
Note of 2026-10-29: what holds it back
Its promote_when is unmet: the review classifies published reports and adds no data, and no experiment has been read in which disrupting suppression in a lineage without described cancer-like growth lets cheating cells arise and spread, nor comparative work showing suppression scaling with body size across independent origins of multicellularity. It could be narrowed to what Aktipis et al. report and propose, keeping the wide form as a Proposed THEORY under ADR-047’s kind 1, if a claim comes to need only that.