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Kaplan-Meier survival analysis of overall survival rate (OSR) according to T category of American Joint Committee on Cancer (AJCC) 7th edition (A), T category of AJCC 8th edition (B), 7th AJCC prognostic group (C), 8th AJCC prognostic group (D), European Neuroendocrine Tumors Society (ENETS) prognostic group (E), N category (F), 7th M category (G), 8th M category (H), and grade (ENETS/World Health Organization [WHO] 2010) (I).
