Recurrent alterations are associated with esophageal adenocarcinoma brain metastases.

Unlabelled: Brain metastases in esophageal adenocarcinoma (EAC) patients are associated with poor prognosis and remain understudied. We performed multi-omics analysis with whole-genome sequencing and single-cell spatial transcriptomics on the brain metastases and matched primary tumors. Our analysis identified as a recurrent oncogene in EAC brain metastases, with 9 out of 10 cases harboring amplifications. Single-cell whole-genome and multi-region sequencing revealed that alterations, occur early during disease progression and are associated with monoclonal seeding. Although the median survival in our cohort was 13 months, one patient on HER2 antibody-drug conjugate therapy remains a long-term survivor beyond 34 months. Interestingly, the sole patient without an alteration had deletion, high T cell infiltration in the brain lesion, and survived 35 months after immune checkpoint therapy. Our findings have significant clinical implications for the treatment and management of EAC brain metastases.

Highlights: is an early recurrent and targetable oncogene alteration in EAC-BM High T cell infiltration in -deleted tumor links to immunotherapy response Genomic instability of EAC-BM is marked by presence of micronuclei and ecDNAEAC brain metastasis resembles monoclonal seeding events.