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Cancer prevalence in animals increases with body size and mutation rate, but decreases with longer pregnancies. Studying species with unusual cancer rates offers insights into cancer prevention and syndromes.

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Area of Science:

  • Comparative oncology
  • Evolutionary biology
  • Veterinary pathology

Background:

  • Cancer is a significant concern across species, yet prevalence varies widely.
  • Understanding the evolutionary drivers of cancer susceptibility is crucial.

Purpose of the Study:

  • To investigate the relationship between species-specific traits and cancer prevalence.
  • To identify factors influencing neoplasia and malignancy rates across diverse animal groups.

Main Methods:

  • Analysis of 16,049 necropsy records from 292 tetrapod species (amphibians, sauropsids, mammals).
  • Statistical modeling to assess the impact of adult mass, somatic mutation rate, and gestation time on cancer prevalence.

Main Results:

  • Neoplasia and malignancy prevalence positively correlate with adult mass and somatic mutation rate.
  • Cancer prevalence is inversely related to gestation time.
  • The effect of adult mass on malignancy was significant only after controlling for gestation time.
  • Identified outlier species with exceptionally high (ferrets, opossums) or low (porpoise, fruit bat, penguin) cancer rates.

Conclusions:

  • Cancer susceptibility is shaped by evolutionary pressures, including periods of rapid change and stabilizing selection.
  • Investigating species-specific cancer variations can reveal mechanisms of cancer suppression and resistance.
  • Findings may inform novel strategies for cancer management and prevention in various species.