This is a non-interventional, observational, multicenter and retrospective study that will not under any circumstances interfere in the physician's normal clinical practice. Being limited to the collection of patient data already filled in the Tumor Thoracic Registry (TTR) data base and the data from stage IIIA clinical trials case report forms, it does not entail any diagnostic or therapeutic procedure outside of normal clinical practice.~The primary objective is to assess pathological response after neoadjuvant treatment as a subrogate endpoint for overall survival and disease-free survival in resectable stage IIIA non-small cell lung cancer patients.~It is estimated that around 15-20 Spanish sites are enrolling patients with these characteristics in the TTR or in the stage IIIA clinical trials of the Fundación GECP.~Pathologists and physician's of these sites will be invited to participate in the PLANET study as all cases will be clinical-pathologically re-evaluated to reach the study objectives. Each pathologist will re-evaluate the specimens from the selected patients under common criteria.The sample size would be 150 patients enrolled in the study.
This is a non-interventional, observational, multicenter and retrospective study. Being limited to the collection of patient data already filled in the Tumor Thoracic Registry data base and the data from stage IIIA clinical trials case report forms.