MKI67 and gastric cancer: Notably, organoids derived from primary gastric cancer tissues exhibited a vacuolated morphology, whereas those derived from peritoneal metastatic tissues displayed tightly packed cellular arrangements, consistent with previously published studies.[24, 25] Representative bright‐field images of the organoids were captured, and subsequent analyses included hematoxylin and eosin (H&E) staining as well as immunohistochemical analysis of key biomarkers, including Ki67 and CK7.