Affiliation:
1. Department of Pathology Cancer Hospital of the University of Chinese Academy of Sciences (Zhejiang Cancer Hospital) Institute of Basic Medicine and Cancer (IBMC) Chinese Academy of Sciences Hangzhou Zhejiang China
2. The Second Clinical Medical College of Zhejiang Chinese Medical University Hangzhou Zhejiang China
3. Graduate School Zhejiang Chinese Medical University Hangzhou Zhejiang China
Abstract
AbstractBackgroundZolbetuximab (IMAB362) is under investigation for treating advanced gastrointestinal tumors because it targets Claudin18.2 (CLDN18.2). CLDN18.2 is a promising molecule along with the presence of human epidermal growth factor receptor 2 in gastric cancer. This study evaluated cell block (CB) preparations of serous cavity effusions for the feasibility for CLDN18.2 protein expression and compared the results with those of biopsy or resection specimens. The association of CLDN18.2 expression in effusion samples and the clinicopathological features were also investigated.MethodsCytological effusion specimens and matched surgical pathology biopsy or resection specimens of 43 gastric and gastroesophageal junctional cancer cases were stained for CLDN18.2 expression and quantified using immunohistochemistry based on the manufacturer's instructions.ResultsPositive staining was detected in 34 (79.1%) tissue and 27 (62.8%) effusion CB samples in this study. When “positivity” was defined as moderate‐to‐strong staining in ≥40% viable tumor cells, CLDN18.2 expression was observed in 24 (55.8%) tissue and 22 (51.2%) effusion CB samples. A cutoff of 40% for CLDN18.2 positivity was used to demonstrate high concordance (83.7%) between cytology CB and tissue specimens. The results showed that CLDN18.2 expression in effusion specimens correlated with tumor size (p = .021) but not with sex, age at diagnosis, primary tumor location, staging, Lauren phenotype, cytomorphologic features, or Epstein‐Barr virus infection. Cytological effusions with or without CLDN18.2 expression did not significantly affect overall survival.ConclusionsThis study's results show that serous body cavity effusions may be suitable for CLDN18.2 biomarker testing; however, discordant cases should be interpreted cautiously.
Cited by
3 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献