Low CCND2 expression was associated with a poor survival in breast cancer and lung cancer patients while using the log-rank test (Figure 3A,B, p = 0.048 and p = 0.012, respectively), but this association was not found in colon cancer, esophageal cancer, and gastric cancer patients (Table 1, Figure S1). Here, CCND2 is linked to esophageal cancer.