Table 1.

Diagnostic performance of positron emission tomography (PET)/CT for unknown primary carcinoma

Study	Year	Number of patients	Study design	Primary tumour detection rate (%)	Sensitivity (%)	Specificity (%)
Regelink et al18	2002	50	Retrospective	32	100	94
Stockeli et al19	2003	18	Prospective	33	63	90
Gutzeit et al20	2005	18	Retrospective	33	35	0 (0/1)
Freudenberg et al25	2005	21	Retrospective	57	86	100
Fakrhy et al21	2006	22	Retrospective	32	70	75
Nassenstein et al22	2007	39	NR	28	100	85
Wartski et al23	2007	38	Retrospective	34	93	73
Johansen et al26	2008	60	Prospective	37	87	68
Rogh et al27	2009	44	Retrospective	43	87.5	82.1
Zhao et al28	2012	25	Retrospective	84	73.3	28.6
Wong et al24	2012	78	Retrospective	38.5	100	66.7
Pereira et al29	2012	49	Retrospective	18.4	69.2	81.6
Lee et al30	2015	56	Prospective	50	69	88

NR, not reported.