MKI67 and Burkitt lymphoma: The immunophenotype (CD20, CD10, bcl‐6 and IgM positivity, bcl‐2 negativity, a high Ki67 proliferative index of >95%) (Figure 2A–D; Table 1), MYC protein expression (Figure 2E), and cytogenetics (MYC translocation as shown with both dual fusion and a BAP; Figure 2E, inset) were consistent with BL (Table 1).