In line with a pro-proliferative character of polyamines, executed, among others, by polyamine-induced p21CIP1/WAF1 synthesis [24], ODC1 expression correlated positively with CDKN1A and Ki67. Moreover, variability in CDKN1A expression independently predicted ODC1 variation in non-cancerous tissue and variability in Ki67—in gastric tumors. This evidence concerns the gene ODC1 and gastric neoplasm.