Brief Article
Copyright ©2011 Baishideng Publishing Group Co.
World J Gastroenterol. Dec 28, 2011; 17(48): 5295-5304
Published online Dec 28, 2011. doi: 10.3748/wjg.v17.i48.5295
Table 2 Frequency of human papillomavirus DNA in tumors by cancer site and country n (%)
Cancer site countryTotalHPV-positiveHPV16-positiveMultiple HPV
Oral cavity7140 (56)39 (55)0
Japan178 (47)7 (41)0
Pakistan4827 (56)27 (56)0
Colombia65 (83)5 (83)0
1P value0.305 0.193-
Esophageal16631 (19)24 (14)13 (8)
Japan7511 (15)9 (12)5 (7)
Pakistan4211 (26)9 (21)  5 (12)
Colombia499 (18)6 (12)3 (6)
1P value0.3080.3310.521