Table 2.

Recent literature summary of studies of patients with cancer of unknown primary

Author	Total number of patients	Common pathology (no.)	Autopsy cases	Primary site identified	Common primary site (no.)
Blaszyk [10]	64	Adenocarcinoma (51), squamous carcinoma (3)	64	35	Pancreas (13), intestine (11), lung (8), ovaries (1), prostate (1)
Mayordomo [11]	43	Adenocarcinoma (23), undifferentiated (4), squamous carcinoma (3)	43	35	Bile duct (7), pancreas (6), lung (4), prostate (3), stomach (2)
Maiche [12]	109	Adenocarcinoma (37), squamous carcinoma (33), undifferentiated (31)	64	43	Lung (13), kidney (6), pancreas (4), intestine (4), liver (3)
Al-Brahim [9]	53	Adenocarcinoma (37), undifferentiated (5)	53	27	Lung (7), pancreas (4), stomach (3), bile duct (1), appendix (1)