Local recurrence after surgery for non–small cell lung cancer: A recursive partitioning analysis of multi-institutional data

This derivation and validation study involving 2300 patients who underwent resection for NSCLC explored predictors of local/regional recurrence.  Recurrence-free survival was similar between the datasets.  Predictors of recurrence were different between the datasets.  The derivation dataset identified stage I adeno, stage I squamous/large cell, and stage II-IIIA as predictors.  The validation dataset identified lymphovascular invasion and stage as predictors.