MKI67 and Burkitt lymphoma: Additional diagnostic criteria for Burkitt’s lymphoma include Ki67 positivity/proliferation index > 90%, light chain restriction, nuclear c-myc positivity at immunocytochemistry, and t(8;14)(q24;q32) by fluorescence in situ hybridization [38], as reported by [9, 11, 16, 17, 21–23] (Table 1).