[Features of micro satellite alterations on chromosome 4 in hepatocellular carcinoma].
OBJECTIVE
To study the features of micro satellite alterations and their association with clinicopathological characteristics of hepatocellular carcinoma (HCC).


METHODS
Ten high-polymorphic micro satellite markers on chromosome 4 were selected to be detected for loss of heterozygosity (LOH), micro satellite instability (MSI) and allelic imbalance (AI) in 56 HCC using PCR-simple sequence length polymorphism (PCR-SSLP) analysis.


RESULTS
LOH was found in 40 of 56 HCC (71.4%) on at least 1 locus, the top two loci were D4S426 (61%), D4S1534 (53.7%). LOH on D4S406 was significantly higher in cases with positive serum HBsAg than in those with negative HBsAg. Similarly, LOH on D4S1538 occurred more frequently in patients with HBsAg negative than those with HBsAg positive [76.9% (20/26) vs 12.5% (2/16), chi2=13.999, P<0.01]. LOH on D4S426, D4S1615 and D4S165 were more frequent in poorly or moderately differentiated HCC than in well-differentiated HCC [76.7%(23/30) vs 18.2%(2/11), chi2=9.242, P<0.01; 53.8% (14/26) vs 16.7% (2/12), P<0.05; 60.7% (17/28) vs 18.2% (2/11), P<0.01]. LOH on loci D4S2921 was more frequently detected in tumors with intrahepatic metastasis than in those without [63.6% (21/33) vs 18.2% (2/11), chi2=5.132, P<0.01]. MSI was found in 8.9% (5/56) cases. AI was found in 26.8% (15/56) of all cases examined.


CONCLUSIONS
Frequent micro satellite alterations on chromosome 4 were existed in HCC. LOH, which represents tumor suppressor gene pathway, plays a more important role in hepatocarcinogenesis of HCC; MSI, representing mismatch repair gene pathway, arranges as the next.
Zhang
Shu-hui
SH
Department of Pathology, Eastern Hepatobiliary Surgery Hospital, Second Military Medical University, Shanghai 200438, China.
Cong
Wen-ming
WM
Xian
Zhi-hong
ZH
Wu
Meng-chao
MC
D000328:Adult; D000368:Aged; D006528:Carcinoma, Hepatocellular / Q000235:genetics*; D002894:Chromosomes, Human, Pair 4; D005260:Female; D006801:Humans; D008113:Liver Neoplasms / Q000235:genetics*; D019656:Loss of Heterozygosity; D008297:Male; D018895:Microsatellite Repeats; D008875:Middle Aged