A lex naturalis delineates components of a human-specific, adrenal androgen-dependent, p53-mediated 'kill switch' tumor suppression mechanism
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Updated: Jan 2, 2026
Yeast As a Chassis for Developing Functional Assays to Study Human P53
Published on: August 4, 2019
1ACGT Biotechnology, Collegeville, Pennsylvania, USA.
Abstract:
We have recently described in this journal our detection of an anthropoid primate-specific, adrenal androgen-dependent, p53-mediated, 'kill switch' tumor suppression mechanism that reached its fullest expression only in humans, as a result of human-specific exposure to polycyclic aromatic hydrocarbons caused by the harnessing of fire - but which has components reaching all the way back to the origin of the primate lineage. We proposed that species-specific mechanisms of tumor suppression are a generalized requirement for vertebrate species to increase in body size or lifespan beyond those of species basal to their lineage or to exploit environmental niches which increase exposure to carcinogenic substances. Using empirical dynamic modeling, we have also reported our detection of a relationship between body size, lifespan, and species-specific mechanism of tumor suppression (and here add carcinogen exposure), such that a change in any one of these variables requires an equilibrating change in one or more of the others in order to maintain lifetime cancer risk at a value of about 4%, as observed in virtually all larger, longer-lived species under natural conditions. Here we show how this relationship, which we refer to as the lex naturalis of vertebrate speciation, elucidates the evolutionary steps underlying an adrenal androgen-dependent, human-specific 'kill switch' tumor suppression mechanism; and further, how it prescribes a solution to 'normalize' lifetime cancer risk in our species from its current aberrant 40% to the 4% that characterized primitive humans. We further argue that this prescription writ by the lex naturalis represents the only tenable strategy for meaningful suppression of the accelerating impact of cancer upon our species.
Insights
Humans possess a unique tumor suppression mechanism, a
Area of Science:
- Evolutionary biology
- Cancer research
- Genetics
Background:
- A primate-specific, adrenal androgen-dependent, p53-mediated 'kill switch' tumor suppression mechanism is described, reaching full expression in humans.
- This mechanism evolved due to human-specific exposure to polycyclic aromatic hydrocarbons from fire, with origins tracing back to the primate lineage.
- Species-specific tumor suppression is proposed as a requirement for vertebrates to increase body size, lifespan, or adapt to carcinogenic environments.
Purpose of the Study:
- To elucidate the evolutionary steps of the human-specific 'kill switch' tumor suppression mechanism using the lex naturalis.
- To demonstrate how the lex naturalis explains the relationship between body size, lifespan, carcinogen exposure, and tumor suppression.
- To present a strategy for normalizing human lifetime cancer risk from 40% to the ancestral 4%.
Main Methods:
- Empirical dynamic modeling was used to detect relationships between body size, lifespan, and species-specific tumor suppression mechanisms.
- Analysis of evolutionary pressures, including carcinogen exposure and its impact on tumor suppression.
- Application of the lex naturalis framework to understand human-specific evolutionary adaptations in cancer suppression.
Main Results:
- A relationship, termed lex naturalis, was identified between body size, lifespan, and carcinogen exposure, maintaining a consistent 4% lifetime cancer risk across species.
- The lex naturalis elucidates the evolutionary pathway of the human-specific 'kill switch' tumor suppression.
- The study highlights an aberrant 40% lifetime cancer risk in modern humans, deviating from the ancestral 4%.
Conclusions:
- The lex naturalis provides a framework for understanding species-specific tumor suppression evolution.
- The human-specific 'kill switch' mechanism is a key adaptation to increased carcinogen exposure.
- The lex naturalis prescribes a strategy to reduce human cancer risk, offering the only viable solution for meaningful cancer suppression.
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