Adaptive walks	Sequences of beneficial mutations
Altruistic	An action directed towards another individual which results in a cost to the helper and a benefit to the helped
Angiogenesis	The physiological recruit of new blood vessels
Compensatory mutations	Mutations which offset the negative fitness effects imposed by another mutation
Cooperative	An action which benefits both the helper and any helped
Demographic features	Characteristic features of a population
Direct fitness	An individual's own genetic contribution to the next generation
Epidermal growth factor receptors	Surface growth factor receptors
Fitness landscape	A multidimensional space where an artificial landscape comprised peaks and valleys represents a genotype or phenotype fitness value
Hallmark behaviours	Common traits of cancer cells
Hypoxic	Oxygen depleted environment
Inclusive fitness	The sum of an individual's direct and indirect fitness
Indirect fitness	The genetic contribution to the next generation gained from the reproduction of relatives
Kin member	Genetically related individual
Metastatic (metastasis)	Secondary tumours caused by the migration of cells from the primary tumour to other tissues within the body
Mutualism	Ecological relationship beneficial to both partners
Neoplasm	An abnormal tissue mass
Phenotype	Observable characteristics of an individual resulting from the interaction of its genotype with the environment
Reversion	Back mutation of a point mutation to its ancestral state
Relatedness	The level of consanguinity between two given individuals
Selection gradient	The slope of a regression of fitness on trait value
Somatic cells	Cells which make up the tissues of the body (i.e. not the germ cells)
Stromal	The supporting tissue of an organ
Tyrosine kinase inhibitor (TKI)	A drug that interferes with cell communication and growth and may prevent tumour growth