MTCP1 and B-cell chronic lymphocytic leukemia: Supporting the notion that MTCP1 expression beyond basal levels is advantageous for leukemogenic B cells, screening a large cohort of suspected CLL cases revealed seven additional Xq28 rearrangements with unexplored relevance; two with a translocation at the 12q32 site, one each involving 8q22 or 8q24.2 sites, and three joining unrecognized material with the Xq28 site.