Comparison of Molecular-Genetic Concordance of the Primary Tumor and Brain Metastases of Gastroesophageal Cancers (GENCONCOR-2)
GENCONCOR-2 is a translational research aimed to compare the molecular profile of primary tumors and their matched brain metastases in gastroesophageal cancers, including cancer of the esophagus, gastroesophageal junction, and stomach. The study is based on the previously established international GASTROBRAIN cohort (ClinicalTrials.gov ID: NCT07448493), which provides comprehensive clinicopathological and treatment data for over 230 patients. It will be conducted by retrospective analysis of paired samples of histological material (primary tumor and corresponding brain metastasis) with determination of HER2 expression status (IHC ± FISH), MSI status (IHC ± PCR), PD-L1 combined positive score (CPS), and CLDN18.2 expression status (IHC)
• Men and women aged 18 years or older included in the GASTROBRAIN study with available clinicopathological and treatment data.
• Histologically confirmed gastric adenocarcinoma, esophageal carcinoma (adenocarcinoma or squamous cell carcinoma), or gastroesophageal junction adenocarcinoma.
• History of neurosurgical resection of brain metastases with available archival tissue material, and histological confirmation of metastatic lesion originating from gastroesophageal cancer.
• Availability of paired FFPE tissue samples from primary tumor and matched brain metastasis.