The results of cell cycle detection showed that compared with the control group, the proportion of DB and SU-DHL4 cell lines stably transformed with MYCT1 overexpression vector in G0/G1 phase increased significantly (p < 0.05), while there was no significant difference between S phase and G2/M phase (Figs. 4B, 3C), suggesting that MYCT1 can regulate the DLBCL cell cycle and block it in G0/G1 phase. This evidence concerns the gene MYCT1 and diffuse large B-cell lymphoma.