Table 1.

Eligibility criteria for review on liver resection [33].

Study characteristics	Inclusion criteria	Exclusion criteria
Patient population	Patients with neuroendocrine tumor (NET) liver metastases	Children or adolescents (under the age of 18 years)
	Patients who underwent liver resection or nonsurgical treatment (peptide receptor radionuclide treatment (PRRT), chemotherapy, biotherapy)
Intervention: treatment	Liver resection
	Nonsurgical treatment (chemotherapy, biotherapy, locally ablative techniques, radionuclide therapy)
Intervention: comparison	Liver resection vs nonsurgical treatment (chemotherapy, biotherapy, locally ablative techniques, radionuclide therapy)
Outcomes	Primary outcome: overall survival (OS)	Studies that do not report the OS
	Secondary outcomes: progression-free survival, quality of life
Study design	Randomized controlled trials	Case reports
	Prospective and retrospective comparative cohort studies
	Case-control studies
	Case series