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Fluorescence in situ hybridization (FISH) analysis is recommended for invasive breast carcinomas with equivocal (2+) immunohistochemical expression of human epidermal growth factor receptor 2 (HER2). However, existing guidelines for the retention and storage requirements for HER2 FISH slides vary widely among countries and laboratories. To determine the degradation rateof HER2 FISH signals, and the optimal retention time and storage conditions for HER2 FISH slides. Dual-probe HER2 FISH slides from March 2009 to June 2019 were retrieved