Abstract
Overexpression of human epidermal growth factor receptor 2 (HER2) protein in association with HER2 gene amplification is found in 7–34% of gastric cancers. In breast cancer, HER2 overexpression is a prognostic factor in advanced cases and is associated with tumor progression in ductal carcinoma in situ. However, the biological and clinical significance of HER2 status in early gastric cancer is unknown. Here, we aimed to examine the correlation between HER2 gene amplification and tumor progression in early gastric cancer. The HER2 status was evaluated in 149 lesions from 141 consecutive patients with early gastric cancer who underwent endoscopic resection by immunohistochemistry and dual color in situ hybridization. HER2 gene amplification was detected in 35 (23.5%) of 149 lesions, and of those, 26 cases (74.3%) showed intratumoral heterogeneity. HER2 gene amplification was found in noninvasive carcinoma, and there was a significant correlation between HER2 status and T factor (P = 0.0290). Our study demonstrated that HER2 gene amplification occurred during the early stages of gastric cancer and showed heterogeneity in several cases. HER2 gene amplification may be involved in tumor progression in early gastric cancer.
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This work was supported in part by the Foundation for Promotion of Cancer Research in Japan.
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This study was approved by the ethics committee of Mie University Hospital (Tsu, Japan, approval no. 2746).
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Kanayama, K., Imai, H., Usugi, E. et al. Association of HER2 gene amplification and tumor progression in early gastric cancer. Virchows Arch 473, 559–565 (2018). https://doi.org/10.1007/s00428-018-2433-y
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DOI: https://doi.org/10.1007/s00428-018-2433-y