Non-functioning pancreatic neuroendocrine tumors: Surgery or observation?

Table 3 Retrospective studies regarding surgery vs observational management

Ref.	Study period	Patients n	Group	Number of patients n (%)	Median follow-up time (mo)	Surgery morbidity rate (%)
Gaujoux et al[56]	2000-2011	46	Observational	38 (83)	> 18	62
			Surgery	8 (17)	27
Lee et al[57]	2000-2011	133	Observational	77 (57)	44 (Mean)	46
			Surgery	56 (43)	52 (Mean)
Rosenberg et al[58]	1999-2014	35	Observational	15 (42)	28	35
			Surgery	20 (58)	34
Sharpe et al[60]	1998-2006	380	Observational	71 (19)	60	N/A
			Surgery	309 (81)	60
Sadot et al[59]	1993-2013	181	Observational	1042 (57)	44	N/A
			Surgery	771 (43)	57

¹Matched group;

²Before cross over; N/A: Not available.