A recent phase III clinical trial confirmed that the VeriStrat test can predict which lung cancer patients are likely to fare better when treated with EGFR inhibitors like erlotinib (Tarceva). Patients with advanced non-small cell lung cancer (NSCLC) were tested using VeriStrat before beginning Tarceva treatment. Those who had a VeriStrat result of 'good' experienced longer times without cancer growth and longer overall survival on Tarceva compared to those with a 'bad' result. VeriStrat results may help doctors distinguish patients who should be given EGFR inhibitors from those for whom the benefits would not outweigh the side effects and who would be better served by other treatments. VeriStrat does not test for mutations in the EGFR gene. Instead, the test assesses the pattern of several proteins in the blood to pinpoint patients likely to respond to EGFR inhibitors, including patients who may not have an EGFR mutation.