CTLA4 and acute lymphoblastic leukemia: The results showed that the ALL prognostic signature had a significant positive association with PDCD1 (r = 0.3; p = 6.1e−12; Figure 17B) and CTLA4 (r = 0.33; p = 8.8e−15; Figure 17D) and a significant negative association with HAVCR2 (r = −0.13; p = 0.0035; Figure 17C) and CD274 (r = −0.13; p = 0.0025; Figure 17E).