GSTP1 and cancer: To illustrate with an example, if a Boolean function a′b′c′ is found when analyzing expression data of a particular cancer, this would suggest the possibility that the three genes “gene a,” “gene b,” and “gene c” may cause cancer when all are inactivated, perhaps due to their mutation or to hypermethylation of their promoter, as we previously discussed regarding KRT6E and GSTP1. In turn, this observation may provide motivation to sequence these genes in cancerous tissues.