HLA-DRB1 and myeloid sarcoma: The percentage of MS patients increased in the group of subjects with LBS plus the presence of HLA-DRB1*15:01 (56.0%), was higher when the two factors were LBS plus smoking (66.7%) and became maximum when we considered the presence of the 3 factors, LBS, smoker and presence of HLA-DRB1*15:01 (83.3%) (p < 0.00001) (Figure 3).