On November 1, 2018 Magenta Therapeutics (NASDAQ: MGTA), a clinical-stage biotechnology company developing novel medicines to bring the curative power of bone marrow transplant to more patients, reported that the Company will present clinical data and preclinical research at the 60th annual meeting of the American Society of Hematology (ASH) (Free ASH Whitepaper), taking place December 1st through 4th in San Diego, Calif (Press release, Magenta Therapeutics, NOV 1, 2018, View Source [SID1234530654]). Preliminary data in these abstracts became available on the ASH (Free ASH Whitepaper) conference website at 9:00 a.m. ET today. The Company also provided an update today on its ongoing Phase 2 study of MGTA-456 in inherited metabolic disorders, including recent data from the study.

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ASH Abstracts
"Magenta is developing potentially transformative drugs to broaden the reach of one-time, curative cell therapies – including bone marrow transplant, haploidentical transplant, cell and gene therapy and genome editing – to more patients with devastating diseases, including blood cancers, genetic diseases and autoimmune diseases," said Jason Gardner, D.Phil., president, chief executive officer and co-founder, Magenta Therapeutics. "This year’s nine data presentations at ASH (Free ASH Whitepaper) highlight our patient conditioning, mobilization and stem cell expansion programs, giving further insight into our progress in addressing the major unmet needs of the transplant process, including toxic conditioning regimens, inadequate stem cell mobilization and low cell doses. We anticipate building on this progress over the coming year as we move our mobilization program into the clinic and advance our clinical development plan for stem cell expansion in multiple diseases."

Conditioning Programs

CD117-Amanitin Antibody Drug Conjugates Effectively Deplete Human and Non-Human Primate HSCs: Proof of Concept as a Targeted Strategy for Conditioning Patients for Bone Marrow Transplant, Abstract #3314

Presenter: Brad Pearse, Ph.D., Magenta Therapeutics
Session Name: 701. Experimental Transplantation: Basic Biology, Pre-Clinical Models: Poster II
Session Date: Sunday, December 2, 2018
Session Time: 6:00 PM – 8:00 PM
Room: San Diego Convention Center, Hall GH

Targeting CD45 with an Amanitin Antibody-Drug Conjugate Effectively Depletes Human HSCs and Immune Cells for Transplant Conditioning, Abstract #4526

Presenter: Rahul Palchaudhuri, Ph.D., Magenta Therapeutics
Session Name: 701. Experimental Transplantation: Basic Biology, Pre-Clinical Models: Poster III
Session Date: Monday, December 3, 2018
Session Time: 6:00 PM – 8:00 PM
Room: San Diego Convention Center, Hall GH

Single Doses of Antibody Drug Conjugates (ADCs) Targeted to CD117 or CD45 Have Potent In Vivo Anti-Leukemia Activity and Survival Benefit in Patient Derived AML Models, Abstract #3316

Presenter: Jennifer Proctor, Magenta Therapeutics
Session Name: 701. Experimental Transplantation: Basic Biology, Pre-Clinical Models: Poster II
Session Date: Sunday, December 2, 2018
Session Time: 6:00 PM – 8:00 PM
Room: San Diego Convention Center, Hall GH

Antibody Drug Conjugates Targeted to CD45 or CD117 Enable Allogeneic Hematopoietic Stem Cell Transplantation in Animal Models, Abstract #3324

Presenter: Rahul Palchaudhuri, Ph.D., Magenta Therapeutics
Session Name: 701. Experimental Transplantation: Basic Biology, Pre-Clinical Models: Poster II
Date: Sunday, December 2, 2018
Presentation Time: 6:00 PM – 8:00 PM
Location: San Diego Convention Center, Hall GH

Non-genotoxic conditioning facilitates robust HSPC engraftment and multi-lineage development in a dose dependent manner in Fanconi anemia

Presenter: Meera Srikanthan, Ph.D., Fred Hutchinson Cancer Research Center
Session Name: TBA
Date: TBA
Presentation Time: TBA
Location: TBA

Preclinical Data, Stem Cell Mobilization Program

MGTA-145 in Combination with Plerixafor Rapidly Mobilizes High Numbers of Hematopoietic Stem Cells and Graft-Versus-Host Disease Inhibiting Myeloid-Derived Suppressor Cells in Non-Human Primates, Abstract #116

Presenter: Kevin Goncalves, Ph.D., Magenta Therapeutics
Session Name: 711. Cell Collection and Processing I
Session Date: Saturday, December 1, 2018
Session Time: 9:30 AM – 11:00 AM
Presentation Time: 9:45 AM
Room: Manchester Grand Hyatt San Diego, Grand Hall A

Clinical Data, MGTA-456 Stem Cell Expansion Program

Preliminary Phase 2 Results Demonstrate Engraftment with Minimal Neutropenia with MGTA-456, a CD34+ Expanded Cord Blood Product in Patients Transplanted for Inherited Metabolic Disorders, Abstract #3467

Presenter: John Wagner, M.D., Director, Blood and Marrow Transplantation Division, University of Minnesota
Session Name: 732. Clinical Allogeneic Transplantation: Results: Poster II
Session Date: Sunday, December 2, 2018
Session Time: 6:00-8:00 p.m. PT
Room: San Diego Convention Center, Hall GH

MGTA-456 Contains Large Numbers of Expanded Cord Blood (CB) CD34+CD90+ Hematopoietic Stem Cells (HSC) Which Confer All Engraftment Activity and Correlate with Accelerated Neutrophil Recovery after Myeloablative Conditioning in Patients with Hematologic Malignancy, Abstract #2083

Presenter: Tony Boitano, Ph.D., Magenta Therapeutics
Session Name: 721 Clinical Allogeneic Transplantation: Conditioning Regimens, Engraftment, and Acute Transplant Toxicities
Session Date: Saturday, December 1, 2018
Session Time: 6:15-8:15 p.m. PTRoom: San Diego Convention Center, Hall GH

Preclinical Data, MGTA-456 Stem Cell Expansion Program

MGTA-456, A First-in-Class Cell Therapy Produced from a Single Cord Blood Unit, Enables A Reduced Intensity Conditioning Regimen and Enhances Speed and Level of Human Microglia Engraftment in the Brains of NSG Mice, Abstract #115

Presenter: Kevin Goncalves, Ph.D., Magenta Therapeutics
Session Name: 711. Cell Collection and Processing
Session Date: Saturday, December 1, 2018
Presentation Time: 9:30 a.m. PT
Room: San Diego Convention Center, Grand Hall A

MGTA-456 Clinical Development Update

MGTA-456 is a cell therapy providing a high dose of hematopoietic stem cells that are well-matched to the patient, administered through a transplant procedure. The ongoing Phase 2 study in inherited metabolic disorders aims to enroll 12 patients with Hurler’s syndrome, cerebral adrenoleukodystrophy (cALD), metachromatic leukodystrophy or globoid cell leukodystrophy. The primary endpoint is engraftment after transplantation and the secondary endpoint is transplant-related safety and tolerability.

The data as of October 22, 2018 show:

Five patients treated and evaluable: three with Hurler’s syndrome, two with cALD
Five of five patients treated with MGTA-456 met the primary endpoint of successful engraftment by day 42 following the transplant procedure.
In recent historical cohorts of patients undergoing regular cord blood transplantation with identical pre-transplant conditioning, up to 32% did not engraft at comparable time points.
The patients treated with MGTA-456 had minimal neutropenia, lasting for a median of 1 day.
In the historical cohort, neutropenia lasted for a median of 8 days.
Two patients less than 2 years of age with Hurler’s syndrome treated with MGTA-456 in the Magenta study developed autoimmune cytopenia, a known and frequent complication of transplant in these younger patients and patients with Hurler’s syndrome.
The first patient subsequently died from this complication. This was determined to be not related to the MGTA-456 product.
The second patient is currently undergoing treatment for the autoimmune cytopenia.
"Blood stem cell transplantation remains the standard of care for inherited metabolic disorders, which if untreated are generally progressive and lethal. Unfortunately, transplantation remains a difficult and complex procedure," said Paul Orchard, M.D., Medical Director of the Inherited Metabolic & Storage Disease Bone Marrow Transplantation Program, University of Minnesota and principal investigator in the MGTA-456 study. "Many patients experience significant and life-threatening complications, such as dysregulation of the immune system following transplantation, including the emergence of antibodies to components of the blood system. Patients with inherited metabolic disorders, particularly patients with Hurler’s syndrome, are at higher risk for these antibody-associated cytopenias. In a prior transplant protocol using the identical combination of chemotherapy agents for pre-transplant conditioning, evidence of cytopenias was present in 9 of 15 patients under 2 years of age (53%). This has proven less common in older patients."

In light of the elevated incidence of autoimmune cytopenias in very young patients and patients with Hurler’s syndrome, the Company announced today that it has voluntarily focused future enrollment towards pediatric patients older than 2 years of age diagnosed with leukodystrophies. The Company plans to continue enrolling patients with leukodystrophies in the study.

"MGTA-456 is a first-in-class cell therapy with high doses of stem cells, and larger doses of stem cells are correlated with more successful transplant outcomes and faster time to engraftment and immune recovery. It has demonstrated engraftment and robust immune recovery in all 41 evaluable patients that have been treated to date in our Phase 2 study in inherited metabolic disorders and our Phase 1/2 study in blood cancers," said John Davis, M.D., M.P.H., chief medical officer, Magenta Therapeutics. "We are developing MGTA-456 for patients with a broad range of diseases, including leukodystrophies, sickle cell disease and blood cancers, where we believe it has the potential to deliver transformative benefit."

The Company is on track to initiate a Phase 2 study of MGTA-456 in patients with sickle cell disease in the first half of 2019, and an investigator-initiated Phase 2 study in blood cancers is on track to start in 2018.

On November 1, 2018 NewLink Genetics Corporation (NASDAQ:NLNK) reported that an abstract with data pertaining to the use of the Company’s investigational immuno-oncology molecule, indoximod, in combination therapy for patients with newly diagnosed acute myeloid leukemia (AML) has been accepted for an oral presentation at the 60th American Society of Hematology (ASH) (Free ASH Whitepaper) Annual Meeting and Exposition to be held at the San Diego Convention Center, San Diego, CA, December 1-4th, 2018 (Press release, NewLink Genetics, NOV 1, 2018, View Source [SID1234530681]).

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"We are pleased to have an abstract accepted for oral presentation at this year’s ASH (Free ASH Whitepaper) Annual Meeting," said Charles J. Link, Jr, MD, Chairman and Chief Executive Officer. "Our updated Phase 1 data for indoximod plus standard-of-care chemotherapy support the potential for improved outcomes for newly diagnosed AML patients."

Abstract #332 entitled, Indoximod combined with standard induction chemotherapy is well tolerated and induces a high rate of complete remission with MRD-negativity in patients with newly diagnosed AML: results from a Phase 1 trial, Emadi, A., et al, to be presented during oral session 616 entitled, "Acute Myeloid Leukemia: Novel Therapy, excluding Transplantation: Combination Therapy," on Sunday, December 2, 2018, from 9:30-11:00 AM PT, at the ASH (Free ASH Whitepaper) Annual Meeting
As of July when the abstract was submitted, 31 newly diagnosed AML patients were consented, with 25 included in the intent-to-treat (ITT) analysis, and 19 meeting qualifications for the per-protocol (PP) analysis. Per-protocol patients were defined as those who took at least 80% of the scheduled indoximod doses. Of 25 ITT patients, 21 (84%) achieved complete response (CR), and 15 of 19 PP patients (79%) achieved CR. Twelve of the 15 PP CR patients had a minimal residual disease (MRD) sample submitted at the end of induction at the time of abstract submission. MRD negativity was defined by a flow cytometry assay at a level of < 0.02% (Hematologics, Inc., Seattle, WA). Ten of these 12 patients (83%) were MRD negative. As to the other three patients, 2 died of complications of AML treatment prior to a MRD marrow sample being submitted while one patient’s results were pending. Of the 12 patients who had MRD samples submitted at the end of induction, one patient went directly to bone marrow transplant without undergoing consolidation therapy and was therefore taken off protocol. Of the remaining 11 patients, all 11 (100%) were MRD negative at the end of consolidation, the pre-specified endpoint of the protocol.

Data from the abstract suggest that a high percentage of newly diagnosed AML patients treated with indoximod plus standard-of-care (SOC) chemotherapy achieved CR and showed no evidence of minimal residual disease, or were MRD negative. In addition, data show that indoximod was well tolerated.

The abstract may be found on the ASH (Free ASH Whitepaper) Annual Meeting website.

About Indoximod

Indoximod is an investigational, orally available small molecule targeting the IDO pathway. The IDO pathway is a key immuno-oncology target, suppressing immune response and allowing for immune escape by degrading tryptophan with the resultant production of kynurenine. Indoximod reverses the immunosuppressive effects of low tryptophan and high kynurenine through mechanisms that include modulation of the AhR-driven transcription of genes that control immune function. This results in increased proliferation of effector T cells, increased differentiation into helper T cells rather than regulatory T cells, and downregulation of IDO expression in dendritic cells. Indoximod is being evaluated in combination with treatment regimens including chemotherapy, radiation, checkpoint blockade and cancer vaccines across multiple indications including recurrent pediatric brain tumors, DIPG, and AML.

On November 1, 2018 Helix BioPharma Corp. (TSX: HBP), (FSE: HBP) ("Helix" or the "Company"), an immuno-oncology company developing innovative drug candidates for the prevention and treatment of cancer, reported that it will initiate a new clinical program in pancreatic cancer which will be led by Dr. Daniel D. Von Hoff. Dr. Von Hoff is Physician-in-Chief at the Translational Genomics Research Institute ("TGen") and Professor of Medicine at both the Mayo Clinic and the University of Arizona College of Medicine (Press release, Helix BioPharma, NOV 1, 2018, View Source [SID1234531237]).

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Pancreatic cancer is the third leading cause of cancer death in the United States and is very difficult to treat. Treatment options for advanced pancreatic cancer patients are mostly limited to chemotherapy and in certain cases, radiotherapy and surgery. Immunotherapy such as check-point inhibitors, are not widely available as most drug candidates are still in clinical development. It has been speculated that since pancreatic tumours can have a very acidic profile, the application of immunotherapy may be limited.

Based on preliminary but very encouraging internal and collaborative research work with Dr. Robert Gillies of the Moffitt Cancer Center, on animal pancreatic cancer, the Company believes L-DOS47 with its purported action of combating tumour acidity, may contribute significantly to the treatment of pancreatic cancer.

The Company is very excited to work with Dr. Von Hoff on this new clinical program. Dr. Von Hoff is a pioneer in developing new cancer drugs and a prominent opinion leader in the treatment of pancreatic cancer. Dr. Von Hoff’s clinical trial work has led to the approval of three pancreatic cancer drugs by the U.S. Food and Drug Administration ("FDA") for the treatment of patients with advanced pancreatic cancer.

The first clinical study being planned by the Company is a U.S. Phase I/II study of L-DOS47 in combination with Doxorubicin for the treatment of metastatic pancreatic cancer. The Company is currently completing the study protocol and will be looking to submit to the FDA, in the coming months, an investigational new drug ("IND") application.

Given Dr. Von Hoff’s new role in leading this new clinical program, he will be stepping down as a member of the Company’s Advisory Board, effective November 1, 2018. The Company thanks Dr. Von Hoff for his contribution on the Advisory Board and is very much looking forward to Dr. Von Hoff’s valuable ontributions in the Companies pancreatic cancer clinical program.

"We are privileged to work with Dr. Von Hoff and his team on this new clinical program" said Heman Chao,
Helix’s Chief Executive Officer. "Once approved by the FDA, L-DOS47 would be tested in two different
indications, lung and pancreatic cancer. I look forward to starting this new study and am very excited about
expanding the indications of L-DOS47."

On November 1, 2018 GT Biopharma, Inc. (OTCQB: GTBP and Euronext Paris GTBP.PA) ("GT Biopharma" or the "Company"), an immuno-oncology biotechnology company focused on innovative treatments based on the company’s proprietary NK-engager and Bispecific Antibody Drug Conjugate platforms, reported that its Investigational New Drug (IND) application to the U.S. Food and Drug Administration (FDA) is now open and it is authorized to initiate a first-in-human Phase 1 study with GTB-3550 (OXS-3550), its first-in-class (TriKE), for the treatment of acute myelogenous leukemia (AML), myelodysplatic syndrome (MDS) and mastocytosis (Press release, GT Biopharma , NOV 1, 2018, View Source [SID1234539521]). The study will be led by Principal Investigator, Sarah A. Cooley, MD, MS, Associate Professor, Division of Hematology, Oncology and Transplantation at Masonic Cancer Center, University of Minnesota.

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"GTB-3550 is a protein immune engager that binds to natural killer (NK) cells and targets them specifically to leukemia cells," said renowned NK cell expert, Jeffrey Miller, MD, Deputy Director, Masonic Cancer Center, University of Minnesota. "Our team has been working on the optimal construct for years and we are excited to see it is ready for clinical testing. In addition, the same TriKE protein will deliver an interleukin-15 stimulus, a growth factor that makes NK cells proliferate and be more active."

"The clinical trials team at the University of Minnesota is excited to commence the Phase 1 trial testing this novel immunotherapeutic agent, GTB-3550," said Dr. Cooley. "Building on over a decade of successful trials using NK cell infusions from related donors to kill tumors, Masonic Cancer Center researchers designed this protein to activate a patient’s own NK cells and, importantly, to direct them to specifically kill CD33+ tumor cells. The pre-clinical data are extraordinarily compelling, and success with GTB-3550 in this study will allow us to develop a broad pipeline of TriKE agents against different tumor targets."

This single center, first-in-human Phase 1 clinical trial of GTB-3550 will enroll up to 60 subjects with CD33-expressing high risk for refractory/relapsed AML, MDS, or advanced systemic mastocytosis. Subjects will receive a single course of GTB-3550 TriKE given as 3 weekly treatment blocks. Each block consists of four consecutive 24-hour continuous infusions of GTB-3550 TriKE followed by a 72-hour break after Block #1 and #2. Disease response will be assessed by bone marrow biopsy performed between Day 21 and Day 42 after the start of the 1st infusion. Follow-up for response and survival continues through 6 months from treatment start. The primary objective from the Phase 1 dose finding portion of the study will be to identify the maximum tolerated dose (MTD) of GTB-3550 TriKE defined as the dose level that most closely corresponds to a dose limiting toxicity rate (DLT) of 20%. The primary objective from the Phase 2 extended portion of the study will be the potential efficacy of GTB-3550 TriKE, measured using rates of complete and partial remission. Subjects experiencing clinical benefit and no unacceptable side effects may be considered for a 2nd course of GTB-3550 TriKE on a compassionate basis.

"The opening of this IND allows us to proceed with our first-in-class TriKE, Phase 1 study and importantly, marks a significant step forward in our clinical development strategy of our potentially revolutionary product candidate," commented Raymond Urbanski, M.D., Ph.D., Chief Executive Officer of GT Biopharma. "We are privileged to be advancing this program with the world’s leading experts in NK cell-based therapy."

GT Biopharma has an exclusive worldwide license agreement with the University of Minnesota to further develop and commercialize cancer therapies using proprietary TriKE technology developed by researchers at the university to target NK cells to cancer.

About Acute Myelogenous Leukemia (AML)

AML is the most common form of adult leukemia with 21,000 new cases expected in 2018 alone, according to the American Cancer Society. AML patients typically receive frontline therapy, most commonly chemotherapy, which includes cytarabine and an anthracycline, a therapy that has not changed in over 40 years. However, there remains a significant unmet need in these therapies with about half of AML patients experiencing relapses or requiring alternative therapies. The Company is developing GTB-3550 to serve as a relatively safe, cost-effective, and easy-to-use therapy for resistant/relapsing AML and could also be combined with chemotherapy as frontline therapy thus targeting the larger patient population.

About Myelodysplastic Syndrome (MDS)

Myelodysplastic syndromes (MDS) are conditions that can occur when the blood-forming cells in the bone marrow become abnormal, leading to low numbers of one or more types of blood cells. There are several different types of MDS, based on how many types of blood cells are affected and other factors, although the most common finding in MDS is a shortage of red blood cells (anemia). The number of people with MDS diagnosed in the U.S. each year is estimated to be ~10,000. MDS is uncommon before age 50 and is most commonly diagnosed in people in their 70s. In about 1 in 3 patients, MDS can progress to AML, a rapidly growing cancer of bone marrow cells.

About Mastocytosis

Mastocytosis is a rare disorder characterized by abnormal accumulations of mast cells in the skin, bone marrow, and internal organs (liver, spleen, gastrointestinal tract and lymph nodes). Cases beginning during adulthood tend to be chronic and involve the bone marrow in addition to the skin, whereas, during childhood, the condition is often marked by skin manifestations with no internal organ involvement and can often resolve during puberty. In most adult patients, mastocytosis tends to be persistent, and may progress into a more advanced category in a minority of patients. Mastocytosis affects both males and females and can begin during childhood or adulthood. In children, 80% of cases appear during the first year of life, and the majority is limited to the skin. Adults who develop mastocytosis more often have systemic forms of the disease. Cutaneous forms of the disease account for less than 5% of adult cases. An estimate of prevalence from a recent population-based study is approximately 1 case per 10,000 people.

About GTB-3550

GTB-3550 (OXS-3550) is the Company’s first Tri-specific Killer Engager (TriKE) product candidate being initially developed for the treatment AML. GTB-3550 is a single-chain, tri-specific scFv recombinant fusion protein conjugate composed of the variable regions of the heavy and light chains of anti-CD16 and anti-CD33 antibodies and a modified form of IL-15. When the NK stimulating cytokine human IL-15 is used as a crosslinker between the two scFvs, it provides a self-sustaining signal that activates NK cells and enhances their ability to kill. We intend to study this anti-CD16-IL-15-anti-CD33 tri-specific killer engager, or TriKE, in CD33 positive leukemias, a marker expressed on tumor cells in AML, myelodysplastic syndrome, or MDS, and other hematopoietic malignancies. CD33 is primarily a myeloid differentiation antigen with endocytic properties broadly expressed on AML blasts and, possibly, some leukemic stem cells. CD33 or Siglec-3 (sialic acid binding Ig-like lectin 3, SIGLEC3, SIGLEC3, gp67, p67) is a transmembrane receptor expressed on cells of myeloid lineage. It is usually considered myeloid-specific, but it can also be found on some lymphoid cells. The anti-CD33 antibody fragment that will be used for these studies was derived from the M195 humanized anti-CD33 scFV and has been used in multiple human clinical studies. It has been exploited as target for therapeutic antibodies for many years. Improved survival seen in many patients when the antibody-drug conjugate gemtuzumab was added to conventional chemotherapy validates this approach. GT Biopharma believes that GTB-3550 could serve as a relatively safe, cost-effective, and easy-to-use therapy for resistant/relapsing AML and could also be combined with chemotherapy as frontline therapy thus targeting the larger patient population.

On November 1, 2018 Alpine Immune Sciences, Inc. (NASDAQ:ALPN), a leading immunotherapy company focused on developing innovative treatments for cancer, autoimmune/inflammatory, and other diseases, reported two upcoming poster presentations at the 60th American Society of Hematology (ASH) (Free ASH Whitepaper) Annual Meeting and Exposition to be held December 1-4, 2018 in San Diego, CA (Press release, Alpine Immune Sciences, NOV 1, 2018, View Source [SID1234530478]).

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60th ASH (Free ASH Whitepaper) Annual Meeting and Exposition

Abstract Title: Therapeutic Candidate ALPN-101, a Dual ICOS/CD28 Antagonist, Potently Suppresses Human/NSG Mouse Xenograft Graft Vs. Host Disease (GvHD) in a Dose Ranging Study and Reduces Disease Activity in a Mouse Model of Hemophagocytic Lymphohistiocytosis (HLH)
Session Name: 701. Experimental Transplantation: Basic Biology, Pre-Clinical Models: Poster I
Publication Number: 2037
Abstract Title: "Switch" Transmembrane Immunomodulatory Proteins (TIPs) Consisting of High-Affinity PD-1 Extracellular Domains (PD-1 vIgDs) and Costimulatory Intracellular Domains Potently Enhance the Activity of TCR-Engineered T Cells
Session Name: 703. Adoptive Immunotherapy: Poster I
Publication Number: 2052
Both posters will be available in Hall GH of the San Diego Convention Center on Saturday, December 1, 2018 from 6:15 p.m. PT – 8:15 p.m. PT.