Project description:CLL14 (NCT02242942) is a multinational, open-label Phase III study designed to compare venetoclax-obinutuzumab (Ven-Obi) versus chlorambucil-obinutuzumab (Clb-Obi) in previously untreated patients with CLL and co-existing conditions. Between Aug 7, 2015, and Aug 4, 2016, 432 patients were enrolled and randomly assigned to receive either venetoclax plus obinutuzumab (Ven-Obi, n=216) or chlorambucil plus obinutuzumab (Clb-Obi, n=216). In both study arms, patients received fixed-duration treatment of overall 12 cycles, each cycle 28 days long, and entered subsequent post-treatment surveillance. Peripheral blood samples were collected before the start of therapy, as well as every 3-6 months during and after therapy, including at the time of disease progression. The primary endpoint of the study was progression-free survival, secondary endpoints included overall response rate, minimal residual disease response, and overall survival. The primary read-out was conducted after a median follow-up of 28.1 months, when the primary endpoint was met with 30 primary end-point events (disease progression or death) in the Ven-Obi arm and 77 in the Clb-Obi arm (hazard ratio, 0.35; 95% confidence interval [CI], 0.23 to 0.53;P<0.001). Follow-up is ongoing until 9 years after the last patient enrollment. In an exploratory analysis, bulk RNAseq was conducted with CD19-enriched blood from patients before start of therapy (418 patients) and at first relapse (44 patients).
Project description:The combination of venetoclax with azacitidine (ven/aza) has recently emerged as a promising regimen for acute myeloid leukemia (AML), with approximately 70% of newly diagnosed patients achieving complete remission (CR). However, 30% of newly diagnosed and nearly all relapsed patients do not achieve CR with ven/aza. Mechanistically, we previously reported that ven/aza efficacy is based on eradication of AML stem cells through a mechanism involving inhibition of amino acid metabolism, a process which is required in primitive AML cells to drive oxidative phosphorylation. In the present study we demonstrate that resistance to ven/aza occurs as a consequence of up-regulated fatty acid oxidation (FAO), which occurs either as an intrinsic property of RAS pathway mutations, or as a compensatory adaptation in relapsed disease. Utilization of FAO obviates the need for amino acid metabolism into the TCA cycle, thereby rendering ven/aza ineffective. Importantly, we show that pharmacological inhibition of FAO via use of MCL-1 or CPT1 inhibitor drugs restores targeting of ven/aza resistant AML stem cells. Based on these findings we propose that inhibition of FAO is a potential therapeutic strategy to address ven/aza resistance.
Project description:The combination of venetoclax with azacitidine (ven/aza) has recently emerged as a promising regimen for acute myeloid leukemia (AML), with approximately 70% of newly diagnosed patients achieving complete remission (CR). However, 30% of newly diagnosed and nearly all relapsed patients do not achieve CR with ven/aza. Mechanistically, we previously reported that ven/aza efficacy is based on eradication of AML stem cells through a mechanism involving inhibition of amino acid metabolism, a process which is required in primitive AML cells to drive oxidative phosphorylation. In the present study we demonstrate that resistance to ven/aza occurs as a consequence of up-regulated fatty acid oxidation (FAO), which occurs either as an intrinsic property of RAS pathway mutations, or as a compensatory adaptation in relapsed disease. Utilization of FAO obviates the need for amino acid metabolism into the TCA cycle, thereby rendering ven/aza ineffective. Importantly, we show that pharmacological inhibition of FAO via use of MCL-1 or CPT1 inhibitor drugs restores targeting of ven/aza resistant AML stem cells. Based on these findings we propose that inhibition of FAO is a potential therapeutic strategy to address ven/aza resistance.
Project description:Micro-RNA expression data of CD19 selected B-cells from previously treated and relapsed chronic lymphocytic leukemia patients. We aimed to correlate miR-34a with TP53 mutation status and del17p status. CD19 B-cells from previously treated and relapsed chronic lymphocytic leukemia patients were selected for RNA extraction and hybridization on Affymetrix microarrays.