Article
作者: Anthony, Stephen P ; Tan, Fenlai ; Davids, Matthew S ; Liu, Chaomei ; Williams, Charmelle D ; Ravikrishnan, Janani ; Wierda, William G ; Rogers, KerryA ; Collins, Mary C ; Byrd, John C ; Perry, Elizabeth ; Lai, Tzung-Huei ; Chen, Yi ; Shen, Yue ; Mitchell, Andrew ; Diaz-Rohena, Daisy Y ; Lapalombella, Rosa ; Mo, Xiaokui ; Bhat, Seema A ; Muhowski, Elizabeth ; Chen, Yu ; Woyach, Jennifer A ; Sanchez, John ; Misra, Shrilekha ; Kittai, Adam S ; Lozanski, Arletta ; Jain, Nitin ; Kaufman, Tierney ; Satpati, Suresh ; Lozanski, Gerard ; Sampath, Deepa
Patients with chronic lymphocytic leukemia (CLL) respond well to initial treatment with the Bcell lymphoma 2 (BCL2) inhibitor venetoclax. Upon relapse, they often retain sensitivity to BCL2 targeting, but durability of response remains a concern. We hypothesize that targeting both BCL2 and B-cell lymphoma-extra large (BCLXL) will be a successful strategy to treat CLL, including for patients who relapse on venetoclax. To test this hypothesis, we conducted a pre-clinical investigation of LP-118, a highly potent inhibitor of BCL2 with moderate BCLXL inhibition to minimize platelet toxicity. This study demonstrated that LP-118 induces efficient BAK activation, cytochrome C release, and apoptosis in both venetoclax naïve and resistant CLL cells. Significantly, LP-118 is effective in cell lines expressing the BCL2 G101V mutation and in cells expressing BCLXL but lacking BCL2 dependence. Using an immunocompetent mouse model, Eμ-TCL1, LP-118 demonstrates low platelet toxicity, which hampered earlier BCLXL inhibitors. Finally, LP-118 in the RS4;11 and OSU-CLL xenograft models results in decreases in tumor burden and survival advantage, respectively. These results provide a mechanistic rationale for the evaluation of LP-118 for the treatment of venetoclax responsive and relapsed CLL.