Conventional therapies for patients with T-cell prolymphocytic leukemia (T-PLL) such as cytotoxic chemotherapy and alemtuzumab have limited efficacy and considerable toxicity. Several novel agent classes have demonstrated preclinical activity in T-PLL, including inhibitors of the JAK/STAT and TCR pathways, as well as histone deacetylase (HDAC) inhibitors. Recently, the BCL-2 inhibitor venetoclax also showed some clinical activity in T-PLL. We sought to characterize functional apoptotic dependencies in T-PLL to identify novel combination therapy in this disease. Twenty-four primary T-PLL patient samples were studied using BH3 profiling, a functional assay to assess the propensity of a cell to undergo apoptosis ('priming') and the relative dependence of a cell on different anti-apoptotic proteins. Primary T-PLL cells had a relatively low level of priming for apoptosis, and predominantly depended on BCL-2 and MCL-1 for survival. Selective pharmacologic inhibition of BCL-2 or MCL-1 induced cell death in primary T-PLL cells. Targeting JAK/STAT pathway with the JAK1/2 inhibitor ruxolitinib or HDAC with belinostat both independently increased dependence on BCL-2 but not MCL-1, thereby sensitizing T-PLL cells to venetoclax. Based on these results, we treated two patients with refractory T-PLL with the combination of venetoclax and ruxolitinib. We observed a deep response in the JAK3-mutated T-PLL and a stabilization of the unmutated disease. Our functional, precision medicine-based approach identified inhibitors of HDAC and the JAK/STAT pathway as promising combination partners for venetoclax, warranting further exploration of such combinations clinically in T-PLL.
Charles Herbaux, Christoph Kornauth, Stéphanie Poulain, Stephen J F Chong, Mary C Collins, Rebecca Valentin, Liam Hackett, Olivier Tournilhac, François Lemonnier, Jehan Dupuis, Adrien Daniel, Cecile Tomowiak, Kamel Laribi, Loïc Renaud, Damien Roos-Weil, Cédric Rossi, Eric W Van Den Neste, Cecile Leyronnas, Fatiha Merabet, Jean-Valère Malfuson, Mourad Tiab, Loïc Ysebaert, Samuel Y Ng, Franck Morschhauser, Philipp B Staber, Matthew S Davids