Survival benefit of primary tumor resection in pancreatic neuroendocrine tumors with unresectable liver metastases: A meta-analysis

Figure 5 Subgroup analysis of tumor grading in patients with pancreatic neuroendocrine tumor undergoing primary tumor resection vs non-resection treatment. A: Subgroup analysis by study design (prospective vs retrospective); B: Subgroup analysis by sample size (< 400 vs ≥ 400). OR: Odds ratio; CI: Confidence interval.