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Watanabe SN, Imai K, Nanjo H, Wakamatsu Y, Kimura Y, Katayose Y, Kamata S, Terata K, Takahashi E, Ibonai A, Yamaguchi A, Konno H, Yatsuyanagi M, Kudo C, Takashima S, Akagami Y, Nakamura R, Sato Y, Motoyama S, Nomura K, Minamiya Y. Rapid HER2 cytologic fluorescence in situ hybridization for breast cancer using noncontact alternating current electric field mixing. Cancer Med 2020; 10:586-594. [PMID: 33280268 PMCID: PMC7877363 DOI: 10.1002/cam4.3626] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2020] [Revised: 10/07/2020] [Accepted: 11/10/2020] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Human epidermal growth factor receptor 2-in situ hybridization (HER2-ISH) is widely approved for diagnostic, prognostic biomarker testing of formalin-fixed paraffin-embedded tissue blocks. However, cytologic ISH analysis has a potential advantage in tumor samples such as pleural effusion and ascites that are difficult to obtain the histological specimens. Our aim was to evaluate the clinical reliability of a novel rapid cytologic HER2 fluorescence ISH protocol (rapid-CytoFISH). MATERIALS AND METHODS Using a new device, we applied a high-voltage/frequency, noncontact alternating current electric field to tissue imprints and needle rinses, which mixed the probe within microdroplets as the voltage was switched on and off (AC mixing). Cytologic samples (n = 143) were collected from patients with immunohistochemically identified HER2 breast cancers. The specimens were then tested using standard dual-color ISH using formalin-fixed paraffin-embedded tissue (FFPE-tissue DISH) for HER2-targeted therapies, CytoFISH, and rapid-CytoFISH (completed within 4 h). RESULTS All 143 collected cytologic specimens (50 imprinted cytology specimens from resected tumors and 93 liquid-based cytology specimens from needle rinses) were suitable for FISH analysis. The HER2/chromosome enumeration probe (CEP) 17 ratios did not significantly differ between FFPE-tissue DISH and either CytoFISH protocol. Based on HER2 scoring criteria, we found 95.1% agreement between FFPE-tissue DISH and CytoFISH (Cohen's kappa coefficient = 0.771 and 95% confidence interval (CI): 0.614-0.927). CONCLUSION CytoFISH could potentially serve as a clinical tool for prompt determination of HER2 status in breast cancer cytology. Rapid-CytoFISH with AC mixing will enable cancer diagnoses and HER2 status to be determined on the same day a patient comes to a clinic or hospital.
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Affiliation(s)
- Shin-Nosuke Watanabe
- Department of Thoracic Surgery, Akita University Graduate School of Medicine, Akita, Japan
| | - Kazuhiro Imai
- Department of Thoracic Surgery, Akita University Graduate School of Medicine, Akita, Japan
| | - Hiroshi Nanjo
- Department of Pathology, Akita University Graduate School of Medicine, Akita, Japan
| | - Yuki Wakamatsu
- Department of Thoracic Surgery, Akita University Graduate School of Medicine, Akita, Japan
| | | | | | | | - Kaori Terata
- Department of Thoracic Surgery, Akita University Graduate School of Medicine, Akita, Japan
| | - Eriko Takahashi
- Department of Thoracic Surgery, Akita University Graduate School of Medicine, Akita, Japan
| | - Ayano Ibonai
- Department of Thoracic Surgery, Akita University Graduate School of Medicine, Akita, Japan
| | - Ayuko Yamaguchi
- Department of Thoracic Surgery, Akita University Graduate School of Medicine, Akita, Japan
| | - Hikari Konno
- Department of Thoracic Surgery, Akita University Graduate School of Medicine, Akita, Japan
| | - Misako Yatsuyanagi
- Department of Thoracic Surgery, Akita University Graduate School of Medicine, Akita, Japan
| | - Chiaki Kudo
- Department of Thoracic Surgery, Akita University Graduate School of Medicine, Akita, Japan
| | - Shinogu Takashima
- Department of Thoracic Surgery, Akita University Graduate School of Medicine, Akita, Japan
| | | | | | - Yusuke Sato
- Department of Thoracic Surgery, Akita University Graduate School of Medicine, Akita, Japan
| | - Satoru Motoyama
- Department of Thoracic Surgery, Akita University Graduate School of Medicine, Akita, Japan
| | - Kyoko Nomura
- Department of Environmental Health Science and Public Health, Akita University Graduate School of Medicine, Akita, Japan
| | - Yoshihiro Minamiya
- Department of Thoracic Surgery, Akita University Graduate School of Medicine, Akita, Japan
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