BioLineRx (BLRX) Reports Positive Phase 2a Correlative Data and Detailed Mechanism-of-Action Data for BL-8040
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BioLineRx Ltd. (NASDAQ: BLRX) disclosed today positive Phase 2a correlative data, as well as detailed mechanism-of-action data, for BL-8040, the Company's leading oncology platform, that will be presented at the 58th American Society of Hematology (ASH) Annual Meeting and Exhibition in San Diego, California, taking place December 3-6, 2016.
In a poster titled, "The Selective Anti Leukemic Effect of BL-8040, a Peptidic CXCR4 Antagonist, is Mediated by Induction of Leukemic Blast Mobilization, Differentiation and Apoptosis: Results of Correlative Studies from a Ph2a Trial in Acute Myeloid Leukemia", BioLineRx reports the final correlative results from its Phase 2a trial in acute myeloid leukemia (AML). The trial consisted of 45 AML patients receiving BL-8040 monotherapy on days 1-2, followed by the same dose of BL-8040 plus chemotherapy (Cytarabine) on days 3-7. All patients had poor-risk disease and had been heavily pretreated, with 19% having relapsed after a short first remission (≤12 months), 17% having 2 or more relapses, while 45% were refractory to 1-2 induction treatments.
As previously reported, the composite complete remission rate, including both complete remission (CR) and complete remission with incomplete blood count recovery (CRi), was 38% in subjects receiving BL-8040 dose ≥1.0 mg/kg (n=39). In the 1.5 mg/kg dose selected for the expansion phase of the study (n=22), the composite complete remission rate was 41%. These response rates are superior to the historical response rate of approximately 20% reported for high-risk AML patients treated with Cytarabine alone. The ongoing follow-up of responding patients (n=19) showed median Event Free Survival of 9.3 months (range of 4.3-12.8 months).
Results further show that BL-8040 monotherapy had a substantial therapeutic effect. Treatment with BL-8040 as a single agent triggered robust mobilization of AML blasts from the bone marrow to the peripheral blood stream, and the extent of mobilization was correlated with a positive response to treatment. The preferential mobilization of AML blasts over normal cells (4.7-fold vs. 1.4-fold, respectively) was further confirmed by FISH analysis in a subset of patients. In addition, BL-8040 monotherapy resulted in a 40% increase in AML blast apoptosis.
In an oral presentation at ASH, entitled "The High Affinity CXCR4 Inhibitor, BL-8040, Induces Apoptosis of AML Blasts and their Terminal Differentiation by Blocking AKT/ERK Survival Signals and Downregulating BCL-2, MCL-1 and Cyclin-D1 through Regulation of miR-15a/16-1 Expression", delivered by Prof. Amnon Peled from the Hadassah Medical Center and Biokine Therapeutics, BioLineRx reports detailed data on the mechanism-of-action by which BL-8040 directly induces apoptosis of AML cells. The data presented are from in vitro studies using human AML cell lines and human primary AML samples, as well as in vivo studies using human primary AML cells engrafted in NOD scid gamma (NSG) mice.
The results of the pre-clinical studies show that BL-8040 treatment in vivo triggered mobilization of AML blasts from their protective bone marrow microenvironment and induced their terminal differentiation, further supporting the data presented by BioLineRx at the American Association for Cancer Research annual conference earlier this year.
In addition, the studies illustrate how BL-8040 increases the expression and activity of a special class of microRNA precursors termed miR-15a/16-1. These microRNA molecules have been previously linked to cancer, and shown to suppress the activity of several tumor-related pro-survival proteins. Therefore, by increasing the expression of miR-15a/16-1 microRNA molecules, BL-8040 decreases the expression of tumor-survival proteins and promotes tumor cell death. Importantly, in both in vitro and in vivo experiments, BL-8040 was found to synergize with a selective Bcl-2 inhibitor (Venetoclax) and an FLT3 inhibitor (Quizartinib, also known as AC220) in inducing AML cell death, pointing at potential drug combination treatments.
Philip Serlin, CEO of BioLineRx, commented, "We are pleased to be presenting additional positive results about BL-8040, our lead oncology platform. In particular, clinical studies show that BL-8040 acts selectively on chemotherapy-resistant cells, which may be beneficial in reduction of residual disease and supports the incorporation of BL-8040 in front-line treatment settings such as AML consolidation. Such studies are currently ongoing. We are also encouraged to see, in pre-clinical models, a synergistic effect between BL-8040 and Venetoclax, and between BL-8040 and Quizartinib, drugs which are also being investigated as AML treatments. Given the high percentage of patients experiencing a relapse or that are refractory to available treatments, we anticipate that BL-8040, in combination with a growing repertoire of drugs, will be able to offer hope to AML patients around the world."
BL-8040 is a short peptide for the treatment of acute myeloid leukemia, solid tumors, and certain hematological indications. It functions as a high-affinity antagonist for CXCR4, a chemokine receptor that is directly involved in tumor progression, angiogenesis, metastasis and cell survival. CXCR4 is over-expressed in more than 70% of human cancers and its expression often correlates with disease severity. In a number of clinical and pre-clinical studies, BL-8040 has shown robust mobilization of cancer cells from the bone marrow, thereby sensitizing these cells to chemo- and bio-based anti-cancer therapy, as well as a direct anti-cancer effect by inducing apoptosis. In addition, BL-8040 has also demonstrated robust stem-cell mobilization, including the mobilization of colony-forming cells, and T, B and NK cells. Furthermore, scientific findings in the field of immuno-oncology suggest that CXCR4 antagonists may be effective in inducing the infiltration of anti-tumor T cells into the tumor. Therefore, when combined with immune checkpoint inhibitors, BL-8040 has the potential to enable activated T cells to better reach tumor cells. BL-8040 was licensed by BioLineRx from Biokine Therapeutics and was previously developed under the name BKT-140.
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