bcl-2 expression in non-Hodgkin's lymphomas is not associated with bcl-2 gene rearrangements

Previous reports have associated bcl-2 gene rearrangements found in non-Hod gkin's lymphomas with an inappropriately elevated bcl-2 expression compared with the mature B-cell stage of development. This study investigates bcl-2 expression in non-Hodgkin's lymphomas (NHL) without bcl-2 gene rearrangeme nts. Molecular analysis in 168 patients with NHL revealed 45 patients witho ut bcl-2 gene rearrangements in which additional immunostaining for bcl-2 p rotein was possible. An unexpectedly high prevalence (39/45) of bcl-2 expre ssion was found. The levels and patterns of bcl-2 expression were not speci fic for the histological type of NHL and were similar to those shown in com parable cases with bcl-2 gene rearrangements. In conclusion, bcl-2 expressi on is not specific for NHL bearing bcl-2 gene rearrangements. This finding implicates the existence of other deregulating control mechanisms of bcl-2 expression, more important than bcl-2 gene rearrangements.