Expression of PCED1A in Hepatocellular Carcinoma and Colorectal Cancer and Its Relationship with Immune Infiltration: Potential as a Diagnostic Marker

ABSTRACT Background Hepatocellular carcinoma (HCC) and colorectal cancer (CRC) pose a significant threat to human health worldwide, characterized by intricate pathogenesis. A PC‐esterase domain containing 1A ( PCED1A ) is a critical number of the GDSL/SGNH superfamily. Aim The aim of this study is to explore the diagnostic value of PCED1A in HCC and CRC and its relationship with immune infiltration. Methods The Cancer Genome Atlas (TCGA) database, Gene Expression Omnibus (GEO) database, the Cancer Cell Line Encyclopedia database (CCLE), and the Human Protein Atlas (HPA) were used to detect the expression of PCED1A in tissues and cells. Cibersoft, Timer, and Xcell were used to analyze the effect of PCED1A on immune cell infiltration. The relationship between PCED1A and the immune checkpoint was analyzed. The coexpression analysis of PCED1A was conducted using the LinkedOmics database. Results PCED1A was increased in HCC and CRC with poor prognosis. Immunohistochemistry demonstrated that PCED1A was highly expressed in HCC and CRC compared to corresponding normal tissues. PCED1A expression was related to poor overall survival (OS) and progression‐free survival (PFS). High PCED1A expression was strongly associated with M2 macrophages, impacting HCC progression. Conversely, low PCED1A expression was closely related to Th2 cells in CRC. In addition, the checkpoint named PDCD1 showed a good correlation with PCED1A high expression group in HCC and CRC. Lastly, the PCED1A and ZNF family showed a complex and intertwined relationship through coexpression analysis on the LinkedOmics database. Conclusion PCED1A , related to tumor immune infiltration, is a promising diagnostic biomarker and a valuable therapeutic target for HCC and CRC.