The results showed that the CDCA3 expression was correlated with the gene markers of T cells (general), of which CD3D (tumor, R = 0.33, p = 1.4E − 10; normal, R = 0.34, p = 0.016), CD3E (tumor, R = 0.19, p = 0.00034; normal, R = 0.32, p = 0.025), and CD2 (tumor, R = 0.21, p = 4.7E − 05; normal, R = 0.31, p = 0.028) in both the tumor tissue dataset and normal tissue dataset from TCGA were chosen (Table 1). The gene discussed is CD3D; the disease is neoplasm.