A Study of Osimertinib With or Without Chemotherapy Versus Chemotherapy Alone as Neoadjuvant Therapy for Patients With EGFRm Positive Resectable Non-Small Cell Lung Cancer

Inclusion Criteria: * Male or female, at least 18 years of age. For patients aged \<20 years and enrolled in Japan, a written informed consent should be obtained from the patient and his or her legally acceptable representative * Histologically or cytologically documented non-squamous NSCLC with completely resectable (Stage II - IIIB N2) disease (according to Version 8 of the IASLC Cancer Staging Manual \[IASLC Staging Manual in Thoracic Oncology 2016\]). * Complete surgical resection of the primary NSCLC must be deemed achievable, as assessed by a MDT evaluation (which should include a thoracic surgeon, specialised in oncologic procedures). * Eastern Cooperative Oncology Group (ECOG) PS of 0 or 1 at enrolment, with no deterioration over the previous 2 weeks prior to baseline or day of first dosing * A tumour which harbours one of the 2 common EGFR mutations known to be associated with EGFR-TKI sensitivity (Ex19del, L858R), either alone or in combination with other EGFR mutations (eg., T790M, G719X, Exon20 insertions, S7681 and L861Q). Exclusion Criteria: * Past medical history of ILD, drug-induced ILD, radiation pneumonitis which required steroid treatment, or any evidence of clinically active ILD. * History of another primary malignancy (including any known or suspected synchronous primary lung cancer), except for the following: Malignancy treated with curative intent and with no known active disease ≥2 years before the first dose of investigational product (IP) and of l…