Other protein hits included Calmodulin-like protein 3, which has been identified as a target in gastric cancer [32], Serpin A12, Caspase recruitment domain-containing protein 18, Alpha-1-antitrypsin, Fibrinogen alpha, Isoform 2 of 14-3-3 protein sigma, and Cathepsin D, which has been highlighted as a GS-associated biomarker in PCa [33]. Here, CTSD is linked to gastric cancer.