ArticleAsian Pacific journal of cancer prevention : APJCP2023
Diagnostic Accuracy of Immunohistochemistry for HER2-Positive Breast Cancer.
Article in Asian Pacific journal of cancer prevention : APJCP, 2023. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 2 papers.
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4 authors at 1 institution in 1 country.
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Abstract
objectiveCurrently, human epidermal growth factor receptor 2 (HER2)-positive breast cancer cells are diagnosed under the American Society of Clinical Oncology (ASCO) and College of American Pathologists (CAP) 2018 guidelines. The guideline combined the results of in situ hybridization (DISH) and immunohistochemistry (IHC) techniques. The IHC technique is easy, cheap, and suitable for developing country. Therefore, in this study, we validated the use of IHC alone compared to the results of HER2 amplification under ASCO/CAP 2018 guidelines in diagnosed HER2 positive breast cancer cells.
methodsA total of 510 breast cancer tissue samples from Rajavithi Hospital in Bangkok, Thailand, from January 1st, 2022, to May 31st, 2023, were analyzed by IHC, followed by dual ISH (DISH). We selected 58 samples of IHC equivocal (score 2+) and 98 samples of IHC positive (score 3+) to analyze the diagnostic values by comparing them to the results of HER2 amplification.
resultsThe HER2 IHC score was found to agree with HER2 amplification with a sensitivity of 87.96%, a specificity of 93.75%, a positive predictive value of 96.94%, a negative predictive value of 77.59%, a positive likelihood ratio of 14.07, a negative likelihood ratio of 0.13, and an accuracy of 89.74%.
conclusionThe promising outcomes suggest that a positive IHC test result (score 3+) could potentially stand alone for patients with breast cancer undergoing anti-HER2 treatment, even without DISH confirmation.
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