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. 2018 Jan 12;23(4):422–432. doi: 10.1634/theoncologist.2017-0364

Table 4. Cox proportional hazards regression model for overall survival.

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Primary tumor site strata: Favorable = appendix, jejunum‐ileum, and duodenum; Intermediate = pancreas and stomach; Unfavorable = colon, rectum, unknown, enteric NOS, hepatobiliary, and esophagus.

Cox regression was stratified by the year of diagnosis.

Test of proportional hazards assumption: chi‐square = 14.70, p = .401.

Based on imputed data.

Ki‐67 percentage not included due to collinearity with the proliferation‐based WHO 2010 grade.

Abbreviations: —, no data; CI, confidence interval; G, grade; MEN, multiple endocrine neoplasia; NEC, neuroendocrine carcinoma; NET, neuroendocrine tumor; PD, poorly differentiated; Ref., reference value; TNM, tumor‐node‐metastases staging system; WD, well differentiated; WHO, World Health Organization.