Subsequently, analysis of DDR1 expression in GC tissues through GEPIA2 (http://gepia2.cancer-pku.cn), which integrates GTEx and TCGA databases, revealed significantly elevated levels in tumor tissues, with P < 0.05 and |log2(fold change)| ≥ 0.5 as significance thresholds (Fig. 1B). The gene discussed is DDR1; the disease is neoplasm.