GPA33 and neoplasm: Next-generation complementarity-determining region 3 (CDR3) DNA sequencing (NGS) and enzyme-linked immunosorbent assay (ELISA) were both used to measure efficacy of antibody enrichment during biopanning.<h4>Results</h4>GPA33 exhibits superior tumour-specific expression compared with Claudin 18.2, the latter of which is expressed in normal gastric tissue.