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Evaluation of HER-2 status in breast carcinoma by fluorescencein situ hybridization and immunohistochemistry



Evaluation of HER-2 status is essential for selecting appropriate candidates for treatment with trastuzumab, a recombinant humanized monoclonal antibody active against human epidermal growth factor receptor-2 (HER-2) protein.


To standardize a HER-2 diagnostic system for breast cancer tissue, we compared immunohistochemistry (IHC) and fluorescencein situ hybridization (FISH) results. We studied specimens from 110 patients with invasive ductal breast cancer who underwent operation. IHC analysis was performed using HercepTest™ (Dako A/S), and results assessed according to the HercepTest™ criteria. FISH was performed using a PathVysion™ HER-2 DNA probe kit (Vysis Inc.), with specimens considered HER-2 positive if the ratio of the total HER-2 signals to chromosome 17 centromere (CEP17) signals was greater than 2.


FISH results were indefinite in 3 patients and positive in 24 patients (22%). IHC scores were 0 in 27 patients (25%), 1+in 53 patients (48%), 2+in 10 patients (9%), and 3+in 20 patients (18%). All 20 patients with a score of 3+by IHC were positive by FISH, with only 1 (10%) of 10 patients with an IHC score of 2+positive by FISH.


Our results indicated that an IHC score of 3+is equivalent to FISH-positivity for HER-2 diagnosis, while patients with an IHC score of 2+should undergo FISH testing.

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Human epidermal growth factor receptor-2


Fluorescencein situ hybridization



CEP 17:

Chromosome 17 centromere


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Author information

Correspondence to Hiroyuki Ogura or Futoshi Akiyama or Fujio Kasumi or Teruhisa Kazui or Goi Sakamoto.

Additional information

Reprint requests to Hiroyuki Ogura, Department of Breast Pathology, The Cancer Institute of the Japanese Foundation for Cancer Research, 1-37-1, Kami-lkebukuro, Toshima-ku, Tokyo 170-8455, Japan.

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Ogura, H., Akiyama, F., Kasumi, F. et al. Evaluation of HER-2 status in breast carcinoma by fluorescencein situ hybridization and immunohistochemistry. Breast Cancer 10, 234–240 (2003).

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Key words

  • Breast cancer
  • HER-2
  • Fluorescencein situ hybridization
  • Immunohistochemistry