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Kaplan–Meier survival analysis of Invasion Classification 2. (A) Kaplan–Meier survival curves of Invasion Classification 2. (B) Kaplan–Meier survival curves of two subgroups in grade 2. Non-invasiveness: Invasion Classification grade 0–1; Unilateral invasiveness: Invasion Classification grade 2; Invasiveness: Invasion Classification grade 3–4; 2A: Knosp grade 3 PAs without surgical invasiveness; 2B: Knosp grade 0–2 PAs with surgical invasiveness. KM: Kaplan–Meier; HR, Hazard Ratio.
