DNTT and diffuse large B-cell lymphoma: An in-depth molecular analysis of TdT+ DLBCL/LBLL cases has established a clonal relationship with preceding them FL and DBCL, by both shared rearrangement of immunoglobulin heavy chain (IgH) gene and identical mutations of other genes, with additional mutations seen at the DLBCL/LBLL stage (22–25).