An immune response subtype of cancer is associated with DNA damage which allows subjects to be stratified for particular therapies including immune therapies which may be combined with DNA damage therapeutics. A method for predicting responsiveness to an antagonist of an inhibitory immune checkpoint and/or an agonist of a stimulatory immune checkpoint comprises determining the expression level of at least one gene selected from Table 2B, 2A or 1 in a sample from the subject. The determined expression level is used to predict responsiveness to an antagonist of an inhibitory immune checkpoint and/or an agonist of a stimulatory immune checkpoint.