Kaplan-Meier survival curve of metastatic well-differentiated neuroendocrine tumors of the digestive system

Kaplan-Meier survival curve of metastatic well-differentiated neuroendocrine tumors of the digestive system. There is statistically significant difference in overall survival (A), disease-free survival (B), and progression-free survival (C) between grade 1 (G1) and grade 2 (G2) tumors based upon the highest Ki67 labeling index.

Reproduced with permission from: Yang Z, Tang LH, Klimstra DS. Effect of tumor heterogeneity on the assessment of Ki67 labeling index in well-differentiated neuroendocrine tumors metastatic to the liver: implications for prognostic stratification. Am J Surg Pathol 2011; 35:853. Copyright © 2011 Lippincott Williams & Wilkins.

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