The results showed that the expression levels of ITGA2, ITGB6, LAMA3, LAMB3, and LAMC2 are significantly correlated with the tumor stage of PAAD patients, while the expression levels of COL1A2 are not correlated with the tumor stage of PAAD patients (Figure 3). The gene discussed is COL1A2; the disease is pancreatic adenocarcinoma.