Abstract
Sex is a significant determinant of cancer incidence and outcome. The effects of sexual differentiation on normal and cancer biology underly this epidemiology. The resultant sex differences in therapeutic target pathways and processes provide a foundation for developing more personalized cancer treatments. However, our efforts at personalization cannot stop there. Humans also have gender, and sex and gender are highly interactive in individuation. Thus, we will also need to consider how gender–sex interactions (GSI) affect cancer biology and clinical parameters such as the timing of diagnoses, clinical trial enrolment, and the completeness of efficacy and toxicity data. Ignoring the effects of GSI can compromise the quality of basic biological and clinical data and the conclusions drawn from them. This is not to say that GSI will always have a significant effect or any effect at all in every cancer study. Rather, it is to say that we know enough about GSI and human cancer to anticipate measurable differences when GSI are considered in research, enabling us to experimentally determine whether their effects are significant. Here, I delve deeply into GSI and cancer, as this approach to treatment personalization holds great promise to benefit all patients with cancer.
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Acknowledgements
I would like to acknowledge all the people who have discussed these topics with me over the years. Work on sex differences in the Rubin lab is supported by R01 CA174737-07, NIH PO1 CA245705, Joshua’s Great Things and The St Louis Children’s Hospital Foundation.
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Glossary
- Anabolism
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The process of building complex molecules from simple ones.
- Anthropomorphic
-
Attribution of human traits to animals.
- Bayesian statistical approach
-
Bayesian statistics are distinct as they incorporate prior knowledge into prior probability distributions allowing for each new piece of data to be incorporated into prior knowledge such that prior probability distributions for each iteration of an experiment can change.
- Consomic Y model
-
Consomic strains of inbred mice possess single chromosomes, like a Y chromosome, derived from another strain through a series of backcrosses.
- Darwinopterus
-
Darwinopterus is a pterosaur, named after Charles Darwin, that lived between 150 and 170 million years ago.
- Default mode network
-
A large-scale functional brain network that is most active when an individual is not interacting with the outside world, such as when they are resting, daydreaming, thinking about themselves and others, remembering or planning.
- DNA imprints
-
An epigenetic phenomenon involving DNA methylation in gametes that results in genes being expressed or not as a function of whether they were maternally or paternally inherited.
- Gender
-
Human traits and behaviours that derive from self-identity interacting with social and cultural expectations about what it means to be a man, a woman or non-binary.
- Gender–sex interaction
-
(GSI). The complex ways in which gender and sex interact to determine an individual’s phenotype and life experience.
- Hominidae
-
The taxonomic primate family, also known as the great apes, that includes orangutans, gorillas, chimpanzees and humans.
- Hypothalamic–pituitary–adrenal axis
-
A brain–body system for the regulation of endocrinological responses to stress.
- Intersectionality
-
A sociological paradigm for integrating the multiple unique contributions of systematized privilege and discrimination to an individual’s life.
- Marsupial
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Marsupials are mammals that are distinguished by having both placentae for early gestational development and an external pouch in which the completion of gestation takes place.
- Meiotic crossing-over
-
Chromosomal crossover occurs during meiosis between two homologous chromosomes to produce new recombinant chromosomes.
- Mode
-
A statistical term meaning the most common value in a dataset.
- Polymorphic variation
-
The condition of there being more than one allele of the same gene that differs in DNA sequence within a population.
- Sex
-
The shared reproductive biology between humans and other sexually reproducing mammals.
- Transcriptomic index approach
-
A Bayesian-based analysis of cancer transcriptomes that supports deeper phenotyping of patients for treatment stratification based on their similarity to other patients of the same sex.
- Wilms tumour
-
A rare kidney cancer that most commonly affects young children.
- Y allele
-
Variation in the sequences of Y-encoded genes within a population.
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Rubin, J.B. Gender and sex interactions are intrinsic components of cancer phenotypes. Nat Rev Cancer 25, 634–648 (2025). https://doi.org/10.1038/s41568-025-00829-4
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DOI: https://doi.org/10.1038/s41568-025-00829-4
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