PTEN-mutant EEC cell lines were resistant to the p110β inhibitors GSK2636771 and AZD6482, and only in combination with the p110α selective inhibitor A66, a decrease in cell viability was observed.... treatment with the p110β isoform-specific inhibitors GSK2636771, AZD6482 and TGX-221 or the p110α isoform-specific inhibitor A66 revealed that the EEC cell lines tested were resistant to these agents...