Assessment of Resistance Mechanisms and Clinical Implications in Patients With<i>EGFR</i>T790M–Positive Lung Cancer and Acquired Resistance to Osimertinib

Acquired resistance to osimertinib mediated by loss of the T790M mutation is associated with early resistance and a range of competing resistance mechanisms. These data provide clinical evidence of the heterogeneity of resistance in advanced NSCLC and a need for clinical trial strategies that can overcome multiple concomitant resistance mechanisms or strategies for preventing such resistance.