Disclosed are methods of treating an individual at risk for a negative outcome associated with a treatment for a disease, in particular a proliferative disorder such as cancer. The method may include the steps of creating a predictive assay that includes both a biomarker and a genetic mutation. The predictive assay indicates the likelihood of a negative outcome associated with a particular treatment in a particular individual, such that an individual may be administered a treatment less likely to be associated with a negative outcome.
