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Overall survival by worst pattern of invasion grade (WPOI) in surgery vs radiation/chemoradiation cohorts. Grading of histologic WPOI was a significant prognostic factor for OS in the surgical cohort (left panel) but not in the radiation/chemoradiation cohort (right panel) by univariable analysis (Kaplan Meier Logrank p=0.0287 and p=0.1724 respectively). Markedly better than expected survival was evident for higher grades WPOI among radiation/chemoradiation patients.
