Defined as ≤10% viable cancer cells in the surgical specimen, as assessed per central pathology laboratory post-surgery (IASLC method). Patients will only be considered to have an MPR if they also have an R0 margin result.

Full Analysis Set (All randomized participants, regardless of the treatment actually received)

Defined as ≤10% viable cancer cells in the surgical specimen, as assessed per central pathology laboratory post-surgery (chemotherapy method). Patients will only be considered to have an MPR if they also have an R0 margin result.

Full Analysis Set (All randomized participants, regardless of the treatment actually received)

Defined as absence of any viable cancer cells in the dissected tumour samples, including the main tumour, lymph nodes, and margins as assessed per central pathology laboratory post-surgery using IASLC method. Patients will only be considered to have pCR if they also have an R0 margin result based on site assessment.

Full Analysis Set (All randomized participants, regardless of the treatment actually received)

Defined as absence of any viable cancer cells in the dissected tumour samples, including the main tumour, lymph nodes, and margins as assessed per central pathology laboratory post-surgery using chemotherapy method. Patients will only be considered to have pCR if they also have an R0 margin result based on site assessment.

Full Analysis Set (All randomized participants, regardless of the treatment actually received)

Measured using pathologic mediastinal lymph node evaluation. Pathological downstaging is defined as baseline N2 patients becoming N1/N0 or N1 to N0 at the time of surgery. Only patients with pathological staging at both baseline and surgery are included in this analysis.

Full Analysis Set (All randomized patients with treatment arms assigned in accordance with randomized treatment allocation, regardless of the treatment actually received.)

Comparing the baseline central cobas® EGFR Mutation Test V2 between tumor tissue DNA and matched plasma ctDNA results (excluding invalid results). Since this endpoint uses pre-randomization data, treatment arms were combined for the analysis.

All screened subjects with evaluable results from screening tissue and plasma results.

Comparing the local EGFR mutation test result used for patient selection with the retrospective baseline central cobas® EGFR Mutation Test V2 results (excluding invalid results). Since this endpoint uses pre-randomization data, treatment arms were combined for the analysis.

All screened subjects with evaluable results from screening tumor samples in both local test and central test. Since this endpoint uses pre-randomization data, randomized component treatment arms were combined for analysis.

Average change from baseline across all visits are reported. The analysis was performed using a MMRM analysis on the change from baseline in the score at each visit, including subject (random effect), treatment, visit (fixed effect & repeated measure) and treatment by visit interaction as explanatory variables, with the baseline score as a covariate along with the baseline score by assessment interaction. EORTC QLQ-C30 has 30 questions and questions are combined to produce symptom scales, individual symptom items, functional scales, and global health status (GHS)/quality of life (QoL). Each of the scale/items range from 0-100 after a linear transformation. Positive change from baseline scores on the GHS/QoL and functioning scales indicate improvement on health status/function, and negative change scores on symptom scales/items represent less symptom severity/improvement on symptom status.

Full Analysis Set (All randomized patients with treatment arms assigned in accordance with randomized treatment allocation, regardless of the treatment actually received.)

Average change from baseline across all visits are reported. The analysis was performed using a MMRM analysis on the change from baseline in the score at each visit, including subject (as a random effect), treatment, visit (as fixed effect and repeated measure) and treatment by visit interaction as explanatory variables, with the baseline score as a covariate along with the baseline score by assessment interaction. EORTC QLQ-LC13 has 13 questions and scores range from 0-100 after a linear transformation. Questions assess cough, hemoptysis, dyspnea, site specific pain, sore mouth, dysphagia, peripheral neuropathy, and alopecia and pain medication. While the QLQ-LC13 includes more scales, only the Coughing, Pain in chest, and Dyspnea subscale scores were analyzed for this endpoint.

Negative change from baseline scores indicates less symptom severity, and thus improvement on health status.

Full Analysis Set (All randomized patients with treatment arms assigned in accordance with randomized treatment allocation, regardless of the treatment actually received.)

Summary of plasma concentrations (nM) of Osimertinib

Pharmacokinetic analysis set

Summary of plasma concentrations (nM) of AZ5104

Pharmacokinetic analysis set