ABSTRACT
Purpose To detect the HER2 gene amplification by fluorescence in-situ hybridization(FISH) and to explore its clinicopathologic relationship with the breast cancer.Methods A prospective study was conducted in 50 cases of breast invasive ductal carcinoma from Beijing Toren Hospital. Clinicopathologic data were summarized and FISH was performed in the paraffin-embedded sections for HER2 gene amplificayion using DNA probe, and immunohistochemical stain for ER, PR and HER2.Results The average age of the patients was 55.5 years. The pathologic grading showed that 11 cases were in grade Ⅰ, 30 cases in grade Ⅱ, and 9 cases in grade Ⅲ. The TNM staging showed that 13 cases were in stage Ⅰ,15 cases in ⅡA,13 cases in ⅡB,6 cases in ⅢA,2 cases in ⅢB,and 1 case in ⅢC.The median metastasis rate of lymph node was 6.91%.33 cases were positive for ER,and 32 cases positive for PR.For HER2 detection, 40 cases were positive by IHC and 33 positive by FISH. HER2 gene amplification by FISH was closely related with the expression of HER2 protein by immunohistochemistry, but not significantly related with pathologic grading, The TNM staging, median lymph node metastasis rate, ER and PR status (P>0.05). FISH test was positive in 3 cases of tumor embolus and 3 cases of multiple primary tumors. Conclusions FISH and immunohistochemistry for detecting HER2 have a good conformance, HER2 gene amplification may be related with tumor embolus and multiple primary tumors, but it can not be used as an indirect marker to predict the prognosis.
ABSTRACT
Objective Through comparision of HER2/neu status detected by immunohistoehemistry (IHC),fluorescence insitu hybridization(FISH)and chromogenic insitu hybridization(CISH),to explore the clinical significance of FISH and CISH on detecting gene status of HER2.Methods Sixty-four paraffinembedded breast samples whose pathological types were infiltrating ductal carcinomas were tested by IHC for HER2 protein overexpression and CISH,FISH for HER2 gene status.The rate of chromosome 17 polysomy was also analyzed.Results Among the cases of HER2 protein overexpression(+++)group,the concordant ratios of IHC and CISH.FISH detecting HER2/neu status were 100%.Among the cases of HER2 protein overexpression(++)group,the concordant ratios were 95.83%and 91.67%.Among the cases of HER2 protein overexpression(+/-)group,the concordant ratios were also 100%.One case in which FISH and CISH were performed yielded the different results.so the general coincident rate was 98.41%.The incidence of chromosome 17 polysomy Was 45.16%,45.83%and 11.11%in three IHC(+++,++,+/-)groups,and the total incidence was 40.62%.ConclusionIHC is a preliminary screening method;HER2 gene status detected by CISH and FISH have high concordant ratio,CISH is a more convenience and viable method to detect HER2/neu status,when doubling interference of fichromosome 17 polysomy,we need to select FISH further.