CD274 and adenocarcinoma: Five additional proteins were also studied in our previous work due to their relevant functions in adenocarcinoma tumor progression and therapy resistance [27], such as carcinoma stem-cell markers: TRA-1-60 [28], CD326 (epithelial cell adhesion molecule) [29], galectin-3 (Gal-3) [30], the immune checkpoint molecule CD274 (programmed cell death ligand-1) [31], and carcinoma marker cytokeratins (pan-keratin) [32].