CD7 and acute lymphoblastic leukemia: Several lymphatic diseases are associated with CD7-positive T cells or B cells, such as most cases of T cell acute lymphoblastic leukemia (T-ALL) [29], some cases of acute myeloid leukemia (AML) [30], and acute B lymphoblastic leukemia (B-ALL) [31], as well as graft vs. host disease (GvHD) [32,33].