Table 1.

Payoff table represents the change in fitness of a tumour cell with a given phenotype after interacting with another cell. Three phenotypes (GF, PRO and MOT) are represented. Payoffs go to the cells in the leftmost column. For example, fitness change for a GF cell, interacting with an MOT cell is 1 – g + z

	Encounter with
	GF	PRO	MOT
Payoff to
GF	1 − d − g + z	1 − d− g + z	1 – g + z
PRO	1 – d + z	1 − d	1
MOT	1 – m + z	1 − m	1 − m