However, ETP-ALL is defined by the absence of CD1a and CD8, weak or absent expression of CD5, and the presence of two or more myeloid or stem cell markers (e.g., CD13, CD33, CD34, CD117, HLA-DR, CD11b), without fulfilling the full criteria for myeloid lineage assignment [2]. Here, CD34 is linked to acute lymphoblastic leukemia.