BLU-945 in combination with osimertinib resulted in prolonged DOR and survival when compared with BLU-945 or osimertinib as single agents. BLU-701 in combination with osimertinib resulted in superior tumor growth inhibition compared with BLU-701 or osimertinib as single agents....The superior in vivo antitumor activity of BLU-945 or BLU-701 in combination with osimertinib in prolonging the DOR or increasing tumor growth inhibition in these models may have clinical application in improving outcomes of patients with EGFR L858R-driven NSCLC in 1L settings.