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Mateon Therapeutics Announces Updated Data from Fifth Cohort of Phase 1b Study of OXi4503 in Acute Myeloid Leukemia

On October 30, 2017 Mateon Therapeutics, Inc. (OTCQX:MATN), a biopharmaceutical company developing investigational drugs for the treatment of orphan oncology indications, reported updated data from the fifth dose cohort of OX1222, a phase 1b dose-ranging study of OXi4503 in combination with cytarabine in patients with relapsed/refractory acute myeloid leukemia (AML) or myelodysplastic syndromes (MDS) (Press release, Mateon Therapeutics, OCT 30, 2017, View Source [SID1234521300]).

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Mateon previously reported that two of four patients in this cohort of the study had morphological complete remissions following one cycle of treatment with OXi4503. A morphological complete remission occurs when an AML patient has fewer than 5% AML blasts in the bone marrow count following treatment and has no significant hematologic abnormalities or other evidence of disease.

One of the patients showing disease remission discontinued the study due to an unrelated adverse event. The other patient continued to receive treatment with an additional two cycles of OXi4503 and remains in complete remission with a cytogenetic complete response. A cytogenetic complete response occurs when testing shows eradication of chromosomal abnormalities following treatment.

"We continue to see encouraging signs of safety and efficacy for OXi4503 in Study OX1222, including complete remissions at very low doses and evidence of a dose-response as we progressively increase the dose of OXi4503 in the trial," said William D. Schwieterman, M.D., President and Chief Executive Officer of Mateon. "OXi4503 represents a completely new way to treat AML – by both killing tumor cells directly and by destroying their protective environment in the bone marrow. Based on the results seen to date, we are excited about the enormous potential for this compound in relapsed/refractory AML, especially in older patients unable to tolerate the high levels of chemotherapy typically needed to see a response. There is a huge unmet medical need in these patients and they specifically appear to benefit from treatment with OXi4503."

Summarized initial efficacy data generated to date from OX1222 in relapsed/refractory AML or MDS are as follows:

Cohort (Dose) n CR% PR% ORR%
Cohort 1 (3.75 mg/m2) 6 17% 0% 17%
Cohort 2 (4.68 mg/m2) 4 25% 0% 25%
Cohort 3 (6.25 mg/m2) 4 25% 25% 50%
Cohort 4 (7.81 mg/m2) 3 0% 33% 33%
Cohort 5 (9.76 mg/m2) 4 50% 0% 50%
n: number of patients
CR: complete remission
PR: partial remission
ORR: overall response rate (sum of partial and complete)
OXi4503 continues to have a favorable safety profile. The most common adverse events (AEs) of any grade across all cohorts include neutropenia, fever, nausea, anemia and diarrhea. Grade 3 or above AEs which were related to treatment include anemia (32%), decreased platelet count (27%), decreased neutrophil count (23%) and decreased white blood cell count (18%).

Mateon is in the process of expanding the size of future, higher-dose cohorts to 10 patients to increase the utility of the data generated. The company is also continuing discussions to secure a partner or otherwise obtain additional capital prior to initiating treatment in the sixth cohort of Study OX1222.

About Acute Myeloid Leukemia
A devastating form of cancer of the blood and bone marrow, AML is the most common type of acute leukemia in adults and accounts for the greatest number of leukemia deaths in the United States. There is no standard regimen of care for patients who relapse following front-line treatment or have refractory disease. According to the NIH’s National Cancer Institute Surveillance, Epidemiology and End Results (SEER) program, there are an estimated 21,380 new cases of AML and 10,590 deaths expected in 2017 in the United States. AML arises from a clonal hematopoietic stem cell and is characterized by accumulation of malignant myeloblasts in the bone marrow and results in ineffective hematopoiesis. AML often responds initially to front-line treatment of conventional cytotoxic chemotherapy, but it often relapses and long-term disease-free survival is low, posing a significant challenge to treat relapsed and/or refractory disease.

About OXi4503
OXi4503 has received Fast Track designation from the U.S. Food and Drug Administration for the treatment of AML. It disrupts tumor vasculature residing within bone marrow while simultaneously targeting malignant myeloid cells. Preclinical data show that OXi4503 disrupts bone marrow endothelial cells which normally protect AML cells from exposure to chemotherapeutic agents. In human xenograft animal models of AML, OXi4503 has demonstrated almost complete elimination of leukemic cells. In other animal models, the combination of OXi4503 and cytarabine has shown a much greater effect against AML than either agent alone.

New clinical collaboration with SCRI in immune-oncology

On October 30, 2017 Boehringer Ingelheim and Sarah Cannon Research Institute reported an expansion of their strategic partnership to bring innovative treatments to cancer patients by developing novel immuno-oncology therapies (Press release, Boehringer Ingelheim, OCT 30, 2017, View Source [SID1234521329]). The new effort combines Boehringer Ingelheim’s oncology research and Sarah Cannon’s expertise in clinical trial design and recruitment to evaluate BI 891065, a novel and potent SMAC mimetic, alone and as a potential combination partner with PD-1-directed cancer therapy.

SMAC mimetics are a new class of targeted, small molecules that trigger tumor cell death and immune system activation that may enhance the activity of immunotherapies in the treatment of cancer. Through this collaboration, Boehringer Ingelheim’s BI 891065 will be studied in a Phase I clinical trial [NCT03166631] (link is external) alone and in combination with BI 754091 (anti-PD-1) in patients with advanced metastatic solid tumors. The first patient has been enrolled in the Phase I study, which aims to include approximately 100 patients. Previously, the partners had announced a joint clinical development program to study Boehringer Ingelheim’s BI 754091 (anti-PD-1) and BI 754111 (anti-LAG 3) monoclonal antibodies for the combination treatment of multiple cancers with high unmet medical needs. More immune-oncology combination studies are planned moving forward.

Mehdi Shahidi, M.D.
“Ground-breaking advances in immuno-oncology are expected to transform cancer treatment paradigms. We are significantly expanding our efforts in this area including a broad research program focusing on the development of rational combinations of novel immuno-oncology approaches,” said Mehdi Shahidi, M.D., Global Medical Head Oncology, Boehringer Ingelheim. “As part of these ongoing efforts to transform the lives of cancer patients, we are extremely proud to be one of the first companies to bring this innovative combination therapy of an immune checkpoint inhibitor and a small molecule targeted treatment to the clinical stage of development,” added Shahidi.

Preclinical data, presented at the American Association for Cancer Research (AACR) (Free AACR Whitepaper) Annual Meeting and the Keystone Symposia Conference on Molecular and Cellular Biology earlier this year, suggest that BI 891065 is a promising combination partner for checkpoint inhibitors and, when used together, may provide a new approach to cancer therapy.

“We look forward to continuing our research to find more effective therapies for patients across tumor types through novel immune therapies and combinations of therapies,” said Howard A. “Skip” Burris, MD, President, Clinical Operations and Chief Medical Officer, Sarah Cannon. “This expanded collaboration furthers our mission to provide access to the latest treatments in the community for our patients.”

Through Sarah Cannon Development Innovations, a full-service, oncology-focused contract research organization (CRO), Sarah Cannon is providing comprehensive clinical development services and operational delivery of Boehringer Ingelheim’s early stage development programs. Expansion of the collaboration with Sarah Cannon, will enable rapid patient enrollment and expand access to Boehringer Ingelheim’s investigational oncology treatments through Sarah Cannon’s extensive network across the U.S. and UK.

About Sarah Cannon Research Institute
Sarah Cannon Research Institute is the research arm of HCA Healthcare’s global cancer institute, Sarah Cannon. Focused on advancing therapies for patients, it is one of the world’s leading clinical research organizations conducting community-based clinical trials throughout the United States and United Kingdom. Sarah Cannon’s network of strategic sites includes more than 275 physicians who engage in research. The organization has led more than 300 first-in-man clinical trials since its inception in 1993, and has been a clinical trial leader in the majority of approved cancer therapies over the last 10 years.

Additionally, Sarah Cannon offers management, regulatory, and other research support services for drug development and industry sponsors as well as strategic investigator sites through its contract research organization (CRO), Sarah Cannon Development Innovations. For more information, visit sarahcannon.com (link is external).

About Boehringer Ingelheim in Oncology
Boehringer Ingelheim’s oncology research is driven by a passion to advance clinical practice and a determination to improve the lives of patients who are battling cancer. Through our own scientific innovation and partnerships, we are focused on discovering and providing novel best-in-class, breakthrough cancer medications that fit the needs of patients, caregivers and healthcare professionals. We have a clear strategy to become a leader in the field of lung cancer. Boehringer Ingelheim has successfully launched two products globally for non-small-cell lung cancer (NSCLC) that have been widely adopted and established as valuable additions to current clinical practice. Continuous insights and learnings from research and development are key parts of innovation and our way forward to advance clinical practice in lung cancer and other cancer types.

8-K – Current report

On October 30, 2017 Cellectar Biosciences, Inc. (Nasdaq: CLRB) (the “company”), an oncology-focused, clinical stage biotechnology company, reported data demonstrating that the company’s phospholipid ether delivery vehicle conjugated to a non-reactive iodine (I-127), or CLR 127, decreased tumor volumes and markedly delayed tumor regrowth in preclinical in vitro and in vivo animal studies of both pediatric and adult cancers. Investigators observed that CLR 127 was taken up and retained in the tumor cells at 6-10 fold higher level than normal tissue and sensitized the tumor cells to external radiation (Filing, 8-K, Cellectar Biosciences, OCT 30, 2017, View Source [SID1234521312]).

University of Wisconsin investigator, Dr. Mario Otto presented these data during a poster presentation held at the AACR-NCI-EORTC (Free AACR-NCI-EORTC Whitepaper) International Conference on Molecular Targets and Cancer Therapeutics (EORTC-NCI-AACR) (Free ASGCT Whitepaper) (Free EORTC-NCI-AACR Whitepaper) held by the American Association for Cancer Research (AACR) (Free AACR Whitepaper), National Cancer Institute and European Organisation for Research and Treatment of Cancer. The poster, titled “The Phospholipid Ether Analog CLR 127 Delays Radiation-Induced dsDNA Damage Repair in Pediatric and Adult Solid Tumors,” was presented on Saturday, October 28th at 12:30 PM ET at the Pennsylvania Convention Center in Philadelphia.

Dr. Otto and his fellow investigators treated adult and pediatric cancer cells and in vivo xenograft-bearing mice with CLR 127 followed by external radiation. The group reported that the effect of the radiation was meaningfully increased versus external radiation alone and persisted at higher levels for up to 24 hours post-administration of the external radiation. Additionally, treatment with CLR 127 appears to inhibit DNA repair function that typically occurs in the tumor cells following radiation treatment.

“The data presented by Dr. Otto and his team provide external confirmation of Cellectar’s PDC tumor targeting capabilities and retention in the tumor cells that may improve clinical outcomes,” said Jim Caruso, president and CEO of Cellectar Biosciences. “This study reports important additional data regarding the potential benefits of combining our PDC platform with external beam radiation for the treatment of both adults and pediatric cancers.”

About Phospholipid Drug Conjugates (PDCs)
Cellectar’s product candidates are built upon its patented cancer cell-targeting delivery and retention platform of optimized phospholipid ether-drug conjugates (PDCs). The company designed its phospholipid ether (PLE) carrier platform to be coupled with a variety of payloads to facilitate the discovery and development of improved targeted novel therapeutic compounds. The basis for selective tumor targeting of our PDC compounds lies in the differences between the plasma membranes of cancer cells compared to those of normal cells. Cancer cell membranes are highly enriched in lipid rafts, which are glycolipoprotein microdomains of the plasma membrane of cells that contain high concentrations of cholesterol and sphingolipids, and serve to organize cell surface and intracellular signaling molecules. PDCs have been tested in more than 80 different xenograft models of cancer.

Transgene to Present Additional Immunology Data from the TIME trial with TG4010 in patients with advanced lung cancer at SITC 2017

On October 30, 2017 Transgene (Paris:TNG), a biotech company that designs and develops viral-based immunotherapies, reported that it will be presenting a poster on additional immunology data generated from the randomized, placebo-controlled Phase 2b trial (TIME) that evaluated the combination regimen of TG4010 and chemotherapy in patients with advanced lung cancer at the Society for Immunotherapy of Cancer (SITC) (Free SITC Whitepaper) Meeting 2017, in National Harbor, Maryland, November 8-12 (Press release, Transgene, OCT 30, 2017, View Source [SID1234521307]).

Poster title: Immune mechanisms of the response to TG4010, a viral-based vaccine, in patients with advanced non-small cell lung carcinoma

• Poster ID: P137

• Date, time, location: Saturday, November 11, 2017, 12:30 – 2:00 pm and 6:30 – 8:00 pm

The abstract will be published on November 7, 2017, on the SITC (Free SITC Whitepaper) website.

All publications on TG4010 can be accessed via www.transgene.fr, Pipeline>Publications.

About TG4010
TG4010 is an immunotherapy that has been designed to express the coding sequences of the MUC1 tumor-associated antigen and the cytokine, Interleukin-2 (IL2) in a modified Vaccinia virus (MVA).
The combination of TG4010 immunotherapy and chemotherapy has demonstrated significant efficacy in terms of progression-free survival and overall survival in patients with advanced stage NSCLC (Quoix et al. Lancet Oncol. 2015). TG4010 is currently being investigated in combination with nivolumab (ICI) for the 2nd-line treatment of advanced NSCLC (NCT02823990). A trial in 1st-line treatment of NSCLC is expected to begin at the end of 2017, evaluating the combination regimen of TG4010 + nivolumab + chemotherapy in patients whose tumors express low or undetectable levels of PD-L1.

Syros Presents New Preclinical PK and PD Data for SY-1365, Its First-in-Class Selective CDK7 Inhibitor, at AACR-NCI-EORTC Conference

On October 30, 2017 Syros Pharmaceuticals (NASDAQ:SYRS), a biopharmaceutical company pioneering the development of medicines to control the expression of disease-driving genes, reported that new preclinical pharmacodynamic (PD) and pharmacokinetic (PK) data providing a rationale for the twice weekly dosing regimen currently being used in the ongoing Phase 1 clinical trial of SY-1365, its first-in-class selective cyclin-dependent kinase 7 (CDK7) inhibitor, in advanced solid tumors were presented at the 2017 AACR (Free AACR Whitepaper)-NCI-EORTC Molecular Targets and Cancer Therapeutics Conference in Philadelphia (Press release, Syros Pharmaceuticals, OCT 30, 2017, View Source [SID1234521306]).

“We are encouraged by the preclinical PK and PD data for SY-1365,” said David A. Roth, M.D., Chief Medical Officer of Syros. “The prolonged PD effect, coupled with the sustained tumor regressions seen in multiple preclinical models of difficult-to-treat cancers using intermittent dosing, support investigation of a twice-a-week dosing regimen for patients. Additionally, based on the correlation between CDK7 target occupancy and the anti-tumor activity of SY-1365, we developed a PD marker for use in our ongoing Phase 1 trial that we believe will help us efficiently identify the optimal dose and regimen for SY-1365.”

Syros scientists evaluated the relationship between SY-1365’s PK, PD and anti-tumor activity in multiple in vivo models, including preclinical models of triple negative breast cancer (TNBC) and acute myeloid leukemia (AML), across a range of doses and regimens from daily to weekly dosing. SY-1365 is a covalent inhibitor that binds irreversibly to CDK7. The data showed:

A prolonged PD effect, as measured by CDK7 target occupancy, with a half-life of about three days, supporting intermittent dosing.
A dose-dependent relationship between CDK7 target occupancy and anti-tumor activity in a preclinical model of AML.
Sustained tumor regressions in multiple in vivo models using a twice weekly dosing regimen consistent with the initial regimen in the ongoing Phase 1 clinical trial.
CDK7 target occupancy in blood cells in preclinical models similar to that seen in tumor cells, supporting the use of an assay measuring target occupancy in patients’ blood samples as a PD marker in the ongoing Phase 1 trial to help guide optimization of the dose and regimen to establish a recommended Phase 2 dose.
The Phase 1 trial of SY-1365 is a multi-center, open-label trial that is expected to enroll approximately 70 patients with advanced solid tumors. The primary objective of the trial is to assess the safety and tolerability of escalating doses of SY-1365, with the goal of establishing a maximum tolerated dose and a recommended Phase 2 dose and regimen. The dose-escalation phase is open to solid tumor patients for whom standard curative or palliative measures do not exist or are no longer effective. Following the dose-escalation phase, expansion cohorts are planned to further evaluate the safety and anti-tumor activity of SY-1365 in patients with triple negative breast, small cell lung and ovarian cancers, to confirm a recommended Phase 2 dose and regimen, and to enroll patients with tumors of any histology in a cohort focused on analyzing biopsied tumor tissue. Additional details about the trial can be found using the identifier NCT03134638 at www.clinicaltrials.gov.

Syros also announced that a publication co-authored by two of its scientific founders Nathanael S. Gray, Ph.D., and Richard A. Young, Ph.D., in the peer-reviewed scientific journal Cancer Discovery (Rusan M., et al., “Suppression of adaptive responses to targeted cancer therapy by transcriptional repression”) highlighted CDK7 inhibition in combination with targeted therapies as a promising new approach for combatting drug resistance. In multiple in vitro and in vivo models of treatment-resistant cancers, a research tool compound, known as THZ1, which inhibits CDK7, enhanced tumor cell killing and impeded the emergence of drug-resistant cell populations when combined with targeted therapies, including MEK, BRAF, EGFR and ALK inhibitors, compared to either THZ1 or the targeted therapy alone. These findings suggest that CDK7 inhibition prevents the formation of active enhancers that drive the increased expression of genes promoting the emergence of drug resistance in response to targeted therapy and blocks transcriptional programs required for the growth and survival of cancer.

Syros has an exclusive, worldwide license from the Dana-Farber Cancer Institute under certain patents relating to CDK7 inhibitors, including THZ1. Using its internal drug discovery capabilities, Syros generated SY-1365 to have better drug-like properties than THZ1, making it suitable for clinical development.