Tumor and microenvironment evolution during chemotherapy combine with bevacizumab in colorectal cancer liver metastasis.

Authors

null

Wangjun Liao

Nanfang Hospital, Nanfang Medical University, Guangzhou, China

Wangjun Liao , Min Shi , Dongqiang Zeng , Na Huang , Yuqi Wang , Jing Li , Chunlin Wang , Xiaoxiang Rong , Yisheng Fang , Siting Zheng , Yichen Xue , Jiao Wang , Jian Guo

Organizations

Nanfang Hospital, Nanfang Medical University, Guangzhou, China, Department of Oncology, Nanfang Hospital, Southern Medical University, Guangzhou, China, Southern Medical University, Guangzhou, China, Geneplus-Beijing Institute, Beijing, China, Geneplus-Beijing Institute, Beijing, Beijing, China, Department of Oncology, Nanfang Hospital, Southern Medical University, Guangzhou, China, Guangzhou, China, Southern Medical University Nanfang Hospital, Guangzhou, China

Research Funding

Other Foundation

Background: Identifying patterns of pathological tumor resistant to treatment regimens and improving tumor’s chemotherapy sensitivity from longitudinal and multi-omics data integration are of paramount importance in order to provide the best chances of cure, especially, for colorectal cancer liver metastases. Methods: We elucidated genomic (ctDNA and whole exome sequencing), immunomic (DNA-based T cell receptor sequencing) and transcriptomic changes from liver metastases, peripheral blood and match primary tumors that accompany the evolution of colorectal cancer liver metastases. In total, 197 histopathologically distinct areas of liver metastases and 72 peripheral blood samples at multiple time points from 15 patients with colorectal cancer were analysis in this study. Results: In responding patients, mutation load from plasma were reduced from baseline (P< 0.001), but changed slightly in tumor tissues (P = 0.351). Transcriptomic analysis and immunohistochemistry revealed that increased infiltration of neutrophils and monocytes were associated with worse outcomes and insensitive response to chemotherapy (Neutrophils: P = 0.003; Monocytes: P = 0.032). Activation of fatty acid metabolism, JAK-STAT, PPAR, insulin and TGF-β signaling pathway were observed in progressive tumor. TCR diversity in response metastatic regions was significantly increased compared with non-responder (P = 0.008). Combination of bevacizumab with chemotherapy facilitated T cell infiltrating to the tumor microenvironment which might consequently benefit from checkpoint immunotherapy (P = 0.006). Conclusions: Our integrative and comparative genomic analysis provides a new paradigm for understanding the evolution and treatment resistance of colorectal cancer liver metastases, with implications for identifying ways to advance treatment regimen and monitoring treatment response of colorectal cancer liver metastases.

Disclaimer

This material on this page is ©2024 American Society of Clinical Oncology, all rights reserved. Licensing available upon request. For more information, please contact licensing@asco.org

Abstract Details

Meeting

2019 ASCO Annual Meeting

Session Type

Poster Session

Session Title

Gastrointestinal (Colorectal) Cancer

Track

Gastrointestinal Cancer—Colorectal and Anal

Sub Track

Anal Cancer

Citation

J Clin Oncol 37, 2019 (suppl; abstr 3568)

DOI

10.1200/JCO.2019.37.15_suppl.3568

Abstract #

3568

Poster Bd #

60

Abstract Disclosures