Copy number-associated gene expression changes were confirmed for 9 out of the 13 (69.2%) genes (ALPK2, CYP3A4, ENAH, ERBB2, HHIPL2, MMP9, PERLD1, PTPRA, and OSMR) thereby validating the results from the integrated microarray analysis and highlighting these genes as potential biomarkers for gastric cancer. The gene discussed is PGAP3; the disease is gastric cancer.