Article
Author: Di Napoli, Arianna ; Micillo, Matilde ; Jaksic, Ozren ; Vaisitti, Tiziana ; Cutrin, Juan Carlos ; Deaglio, Silvia ; Iannello, Andrea ; Lopez, Gianluca ; Kulke, Michael ; Orlik, Christian ; Brandimarte, Lorenzo ; Papotti, Mauro Giulio ; Pahl, Andreas ; Vitale, Nicoletta
Richter syndrome (RS) is the histol. transformation of chronic lymphocytic leukemia (CLL) into an aggressive lymphoma, typically diffuse large B-cell lymphoma (DLBCL), with most cases clonally related to the preceding CLL.The increased interest and efficacy of anti-CD37 -based therapies prompted the development of 3 different anti-CD37-ATACs (amanitin-based ADCs).All 3 anti-CD37 ATACs showed full-blown cytotoxicity on target- pos. Raji cells (Burkitt lymphoma cell line) with half-maximal effective concentration in the low nanomolar and picomolar range (anti-CD37-Ama 1: 2.04 3 10 2 9 M; anti-CD37-Ama 2: 7.5 3 10 2 10 M;anti-CD37-Ama3:3.9 3 10 2 9 M; supplemental Figure 1B).Target specificity was demonstrated by absence of cytotoxicity up to a concentration of 10 2 6 MinaCD37 2 cell line (HEK293 wt ; supplemental Figure 1C).Taken together, the data indicate that CD37 may represent a good candidate for targeting RS cells with highly selective amanitin-based ADCs.