《Table 5Multivariate analysis of factors related to overall survival and progression free sur-vival.

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《Prognostic factors and survival after surgical resection of pancreatic neuroendocrine tumor with validation of established and modified staging systems》

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Multivariable analysis was performed using Cox regression models，with a forwards stepwise entry method.All of the staging systems in Table 3，and patient factors in Table 2 were considered for entry，with the exception of the original and modified Ki67，w

Of the 143 patients analyzed，the age at surgery was 53.5±16.0years，and 60.1%（86/143）were female.Key demographics，surgical and pathological characteristics are summarized in Table 1.Nineteen patients（13.3%）underwent multi-visceral resections，including liver resection for metastases（n=14），hemicolectomy（n=5），adrenalectomy（n=1），small bowel resection（n=1）and subtotal gastrectomy（n=1）.Thirteen patients（9.1%）underwent noncurative debulking surgery of the primary tumor.