Abstract
Cancer dynamics is sometimes associated to well-defined transitions between qualitative properties of neoplasms, or even to the shift from presence to regression. Cancer is largely understood as a Darwinian evolution experiment within organisms, characterized by a break of cooperation between cells. Some patterns of sudden change have been identified as phase transitions, similar to those known from the physics of phase changes. Two of them are analyzed here: (a) the shift from cancer to cancer-free tissues under the interaction with the immune system, and (b) the predicted existence of a threshold of instability associated to unstable tumorigenesis. The nature, evidence and implications of these transitions are discussed.
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Notes
- 1.
Specifically, if we have a chain of length L involving a sequence with only one zero, and assuming that μ b is the probability of mutation per unit and replication round, the probability of recovering the master is given by P(N → M) = μb(1 — b)L−1. If μb is very small, we can approximate (1 — μb)L−1 ≈ exp(—L + 1) ≈ exp(—L). Since L is typically large, the exponential term makes the probability of back mutation extremely small.
- 2.
This is in contrast with standard, so called equilibrium transitions, were we move from one phase to another by increasing the temperature, but the previous phase can be recovered by decreasing the temperature again, which cannot occur in our example by lowering mutation rates.
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Solé, R.V. (2012). Phase Transitions in Cancer. In: d’Onofrio, A., Cerrai, P., Gandolfi, A. (eds) New Challenges for Cancer Systems Biomedicine. SIMAI Springer Series. Springer, Milano. https://doi.org/10.1007/978-88-470-2571-4_3
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DOI: https://doi.org/10.1007/978-88-470-2571-4_3
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