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To study the loss of heterozygosity (LOH) on chromosome 3p in breast cancers and precancerous lesion.LOH at 11 microsatellite loci was detected in 41 cases of breast cancers and 12 cases of precancerous lesion by polymerase chain reaction and silver stain. The expressions of ER, PR, FHIT and hMLH1 were detected in breast cancer by immunohistochemistry.LOH on 3p was detected in 97% of breast cancers. D3S1295, D3S1029 and D3S1038 located at 3p14, 3p21-p22 and 3p25 were identified as the loci with most frequent LOH (53.1%, 43.6% and 52.5%). LOH of D3S1038 and expression of hMLH1 protein correlated with several clinicopathological features. LOH of D3S1295 had significant negative correlation with the expression of FHIT. In breast precancerous lesions, LOH on 3p was detected in 41.7% lesions. D3S1295 and D3S1029 were also identified as the most frequent LOH locus (27.3% and 16.7%). The smallest common LOH region seems likely lie between 3p14 and 3p25.The smallest LOH region indicates the existence of breast tumor related genes and some of them affect gene expression.

The aim of the experiment is to establish two murine hepatocarcinoma (HepA cell line) substrains with different lymphatic metastatic ability and compare their biological characteristics. Two murine hepatocarcinoma substrains, HepA-H and HepA-L, were established by the cell cloning and the selection way of lymph node metastasis. After tumor cells were injected subcutaneously to foot pad of NIH mice, the popliteal lymph node metastatic rates of HepA-H and HepA-L were 83.3% and 16.7% respectively, which has statistical significance (p0.01). There were no metastatic lesions were found in other organs, such as lung, liver, spleen and kidney. In vitro, HepA-H showed a higher ability in growth, migration and adhesion than that of HepA-L. The establishment of two murine hepatocarcinoma substrains provides a useful animal model for the study of mechanism of the lymphatic metastasis.