HLA-DOB and acute lymphoblastic leukemia: Additional analysis by Chi-square test revealed that the recipient SNPs of rs17220087 and rs17213693 located in the HLA-DOB intron were related to the risk of relapse for patients with AML (rs17220087: Chi-square test P = 0.0465; rs17213693: Chi-square test P = 0.0465; Table 4) and ALL (rs17220087: Chi-square test P = 0.0311; rs172213693: Chi-square test P = 0.0311; Table 4).