MKI67 and Burkitt lymphoma: Burkitt’s lymphoma is characterized by a very aggressive clinical presentation, by a typical histological pattern (“starry sky”) with the proliferation of all the neoplastic elements (Ki-67 equal to 100%), by the expression of B markers (CD19, CD20, CD22, CD79a) associated with the expression of membrane IgM and the frequent presence of chromosomal translocations on chromosome 8q involving the MYC oncogene.