Chromosomal imbalances in Korean intrahepatic cholangiocarcinoma by comparative genomic hybridization

Intrahepatic cholangiocarcinoma (ICC) arises from epithelial cells in the intrahepatic bile duct. Until now, only few reports have been available concerning the genetic changes during the progression of ICC. In this study, we analyzed chromosomal aberrations in 19 frozen ICC samples using comparative genomic hybridization. The common chromosomal gains were observed in 8q22 approximately qter (11 cases, 58%), 5p14 approximately pter (32%), 2q33 approximately qter (26%), 7p (26%), 17q21 approximately q22 (26%), 18q12 approximately q21 (26%), and 19q13.1 (26%). DNA amplification was identified in nine tumors (47%). Chromosomal loss was found in Y (60%), 1p34 approximately pter (37%), 4q(32%), 18q21 approximately qter (32%) 19p (32%), X (32%), 5q11 approximately q14 (26%), 8p(26%), 9p (26%), and 17p (26%). Chromosomal aberrations identified in this study provide candidate regions involved in the tumorigenesis and progression of ICC.