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Table 2 Recent literature summary of studies of patients with cancer of unknown primary

From: A case of occult intrahepatic cholangiocarcinoma diagnosed by autopsy

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)