@article{A.J. Ferreri_G.P. Dognini_C. Verona_C. Patriarca_C. Doglioni_M. Ponzoni_2007, place={Pavia, Italy}, title={Re-occurrence of the CD20 molecule expression subsequent to CD20-negative relapse in diffuse large B-cell lymphoma}, volume={92}, url={https://haematologica.org/article/view/4311}, DOI={10.3324/haematol.10255}, abstractNote={We report the first case of diffuse large B-cell lymphoma (DLBCL) of the stomach displaying CD20-negative relapse after rituximab-containing treatment and the re-appearance of CD20 expression at the second failure. The loss of CD20 expression in B-cell lymphomas relapsing after rituximab is a well-known phenomenon, but its actual impact in DLBCL is difficult to estimate. This paradigmatic case suggests that CD20-expression reappearance after purging of CD20-positive clones with rituximab might be an underestimated occurrence in B-cell lymphomas. Accordingly, every relapse, whenever possible, should be histologically assessed with diagnostic and immunophenotyping purposes.}, number={1}, journal={Haematologica}, author={A.J. Ferreri and G.P. Dognini and C. Verona and C. Patriarca and C. Doglioni and M. Ponzoni}, year={2007}, month={Jan.}, pages={e1-e2} }