Heat‑induced antigen retrieval in fluorescence in situ hybridization: An effective approach enhancing signal intensity in poor‑quality FFPE sections
- Qiuxiao Yu
- Chi Zhang
- Wenting Huang
- Li Li
Affiliations: Department of Pathology, National Cancer Center/National Clinical Research Center for Cancer/Cancer Hospital and Shenzhen Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Shenzhen, Guangdong 518116, P.R. China
- Published online on: October 25, 2021 https://doi.org/10.3892/etm.2021.10915
Copyright: © Yu
et al. This is an open access article distributed under the
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Fluorescence in situ hybridization (FISH) serves as an ancillary tool for assessing chromosomal abnormalities and is important in differential diagnoses and treatment decisions. In clinical practice, pathologists encounter unsatisfactory formalin‑fixed paraffin‑embedded (FFPE) sections exhibiting weak fluorescence signals, mostly due to inappropriate tissue processing or preservation, leading to interpretation difficulties. For the present study, FFPE samples for which conventional FISH failed were collected. Instead of a pretreatment step using a commercial kit, heat‑induced antigen retrieval (HIAR) was introduced using either citrate buffer or Tris‑EDTA buffer, while the subsequent experimental workflow remained unchanged. After HIAR‑assisted FISH, the hybridization efficiency and signal intensity were markedly enhanced and no difference in signal adequacy was observed when comparing the effect of the two AR solutions. The present study demonstrated that HIAR is a reliable tool for FISH, particularly for poor‑quality FFPE sections yielding weak or no fluorescence signals in the conventional analysis.