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Cumulative overall survival probability among the total population, in relation to histological type according to the WHO classification estimated by the Kaplan‐Meier method, with a 95% confidence interval (dashed line designates the median) – combined analysis for types A, AB and B1. Survival probability (%). Follow‐up (years). Histological type: A, AB, B1# B2# B3# carcinoma.
