Plasma protein changes reflect colorectal cancer development and associated inflammation

Front Oncol. 2023 May 9:13:1158261. doi: 10.3389/fonc.2023.1158261. eCollection 2023.

Abstract

Introduction: Colorectal cancer (CRC) is the third most common malignancy and the second leading cause of death worldwide. Efficient non-invasive blood-based biomarkers for CRC early detection and prognosis are urgently needed.

Methods: To identify novel potential plasma biomarkers, we applied a proximity extension assay (PEA), an antibody-based proteomics strategy to quantify the abundance of plasma proteins in CRC development and cancer-associated inflammation from few μL of plasma sample.

Results: Among the 690 quantified proteins, levels of 202 plasma proteins were significantly changed in CRC patients compared to age-and-sex-matched healthy subjects. We identified novel protein changes involved in Th17 activity, oncogenic pathways, and cancer-related inflammation with potential implications in the CRC diagnosis. Moreover, the interferon γ (IFNG), interleukin (IL) 32, and IL17C were identified as associated with the early stages of CRC, whereas lysophosphatidic acid phosphatase type 6 (ACP6), Fms-related tyrosine kinase 4 (FLT4), and MANSC domain-containing protein 1 (MANSC1) were correlated with the late-stages of CRC.

Discussion: Further study to characterize the newly identified plasma protein changes from larger cohorts will facilitate the identification of potential novel diagnostic, prognostic biomarkers for CRC.

Keywords: biomarker; colorectal cancer; cytokines; early detection; inflammation; plasma proteomics; prognosis; proximity extension assay.

Grants and funding

This research was funded by the National Science Centre of Poland, grant number 2018/30/Q/NZ6/00769 (granted to ZC). The CRC sample collection from the Medical University of Gdansk was sponsored by the Foundation for Polish Science (FNP) under the International Research Agendas Program (granted to JPD and AP), co-financed by the European Union under the European Regional Development Fund and via the “Excellence Initiative - Research University” program from Medical University of Gdańsk and The Swedish Cancer Society (granted to JPD).