Locally Invasive NSCLC Treated With NEo-Adjuvant Stereotactic Body RadioTherapy and REsection

Inclusion Criteria: * Patients will be included if they are aged 18 years or older, * with biopsy proven NSCLC, * clinically staged T3-T4 marginally resectable i.e. deemed at risk to achieve \<R0 resection (such as invasion of critical mediastinal or hilar structures, nodal extra-capsular extension, chest wall, vertebral bodies, compromised bronchial stump margin, based on CT images of the chest). * Patients also need to be pathologically staged N0-1 disease, * with an SBRT CTV≤200cm3, based on planning CT images. * ECOG status is required to be \<2 within 4 weeks prior to registration and * patients must be deemed medically operable by the surgical team. Exclusion Criteria: * Patients will be excluded if they are deemed medically inoperable by the surgical team * and have a weight loss of ≥10% within 3 months prior to pathological diagnosis. * Patients will also have no absolute contraindication to RT such as connective tissue disease, pacemaker-dependent patient with the pacemaker receiving higher than tolerance dose, had no had previous RT to the current region of the study, that would result in overlap of RT fields, * patients must have no plans to receive other local therapy while on study, except at disease progression, * patients have not had other malignancy within 2 years prior to the study (other than non-melanomatous skin cancers)