Targeting endoplasmic reticulum stress in liver disease.

The accumulation of unfolded protein in the endoplasmic reticulum (ER) initiates an unfolded protein response (UPR) via three signal transduction cascades, which involve protein kinase RNA-like ER kinase (PERK), inositol requiring enzyme-1α (IRE1α) and activating transcription factor-6α (ATF6α). An ER stress response is observed in nearly all physiologies related to acute and chronic liver disease and therapeutic targeting of the mechanisms implicated in UPR signaling have attracted considerable attention. This review focuses on the correlation between ER stress and liver disease and the possible targets which may drive the potential for novel therapeutic intervention. We describe pathways which are involved in UPR signaling and their potential correlation with various liver diseases and underlying mechanisms which may present opportunities for novel therapeutic strategies are discussed.

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RedHill Biopharma Reports 2016 First Quarter Financial Results

On April 20, 2016 RedHill Biopharma Ltd. (NASDAQ:RDHL) (TASE:RDHL) ("RedHill" or the "Company"), a biopharmaceutical company primarily focused on development and commercialization of late clinical-stage, proprietary, orally-administered, small molecule drugs for inflammatory and gastrointestinal diseases, including cancer, reported its financial results for the quarter ended March 31, 2016 (Press release, RedHill Biopharma, APR 20, 2016, View Source [SID:1234511125]).

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Financial highlights for the quarter ended March 31, 2016:

Research and Development Expenses in the first quarter of 2016 were approximately $4.7 million, an increase of approximately $0.9 million, compared to approximately $3.8 million in the first quarter of 2015. The increase resulted primarily from clinical trial costs related to the ongoing Phase III MAP US clinical study with RHB-104 (Crohn’s disease) and the preparations for several Phase II studies with YELIVA for multiple oncology, inflammatory and gastrointestinal indications.

General and Administrative Expenses in the first quarter of 2016 were approximately $1.2 million, an increase of approximately $0.3 million, compared to approximately $0.9 million in the first quarter of 2015. The increase was mainly due to professional fees associated with business development activities, intellectual property costs and share-based compensation costs.

Operating Loss in the first quarter of 2016 was approximately $5.9 million, an increase of approximately $1.1 million, compared to approximately $4.8 million in the first quarter of 2015. The increase was mainly in Research and Development Expenses and General and Administrative Expenses.

Net Cash Used in Operating Activities in the first quarter of 2016 was approximately $5.0 million, an increase of approximately $1.6 million, compared to approximately $3.4 million in the first quarter of 2015. The increase was mainly a result of an increase in research and development activities.

Net Cash Used in Investment Activities in the first quarter of 2016 was approximately $4.6 million, a decrease of approximately $2.5 million, compared to approximately $7.1 million in the first quarter of 2015. The decrease was mainly in bank deposit investments.

Cash Provided by Financing Activities in the first quarter of 2016 was immaterial, compared to approximately $13.2 million in the first quarter of 2015, resulting from a public offering in February 2015 in the U.S.

Cash Balance1 as of March 31, 2016 was approximately $53.4 million, a decrease of approximately $5 million, compared to approximately $58.4 million as of December 31, 2015. The decrease was a result of the ongoing operations, mainly related to research and development activities.

Micha Ben Chorin, RedHill’s CFO, said: "We made significant progress with our advanced clinical programs during the first quarter of 2016 and are excited about the potential milestones expected during the second half of 2016, including the interim DSMB analysis of the RHB-104 Phase III MAP US study for Crohn’s disease, top-line results from the BEKINDA Phase III GUARD study for gastroenteritis and the initiation of a confirmatory Phase III study with RHB-105 for the treatment of H. pylori infection. With a strong cash position of approximately $53 million at the end of the first quarter, we are well-positioned to execute our strategic and operational plans for 2016."

Recent operational highlights:

On February 8, 2016, RedHill announced a research collaboration with Leipzig-based Fraunhofer Institute for Cell Therapy and Immunology (IZI), a research unit of the Fraunhofer Society, one of the largest and most prominent applied research organizations in the world, for the evaluation of RedHill’s Phase II-stage oncology drug candidate, RP101. The research collaboration tests RP101 in pre-clinical oncology models, including pancreatic cancer, in combination with standard-of-care chemotherapies to support existing Phase I and Phase II clinical data. Results from the studies are expected during the second quarter of 2016.

On February 10, 2016, RedHill announced that it had received a Notice of Allowance from the United States Patent and Trademark Office (USPTO) for a new patent covering RHB-104. The patent, entitled "Compositions Comprising Rifabutin, Clarithromycin, and Clofazamine and Uses Therof" has since been issued and is valid through 2029. RedHill currently holds five U.S. patents and multiple international patents for RHB-104.

On March 1, 2016, RedHill announced that it had completed enrollment of over half of the planned 270 patients in the Phase III MAP US study for Crohn’s disease in the U.S. and additional countries. Interim DSMB analysis of the study is expected in the second half of 2016.

On March 10, 2016, RedHill announced the publication of an article evaluating the therapeutic potential of YELIVA (ABC294640), the Company’s orally-administered first-in-class Sphingosine kinase-2 (SK2) selective inhibitor, for the treatment of cholangiocarcinoma (bile duct cancer). The article, describing non-clinical studies conducted with YELIVA, was authored by scientists from the Mayo Clinic Cancer Center, the Hollings Cancer Center at the Medical University of South Carolina and Apogee Biotechnology Corporation. The authors concluded that these findings provide preliminary insight into the possible use of YELIVA as an anticancer drug for cholangiocarcinoma treatment, as well as novel evidence that SK2 may be a rational therapeutic target in the treatment of this cancer.

On March 29, 2016, RedHill and its co-development partner for RIZAPORT, IntelGenx Corp., announced that they had entered into a binding term sheet with Grupo JUSTE S.A.Q.F ("Grupo JUSTE") granting Grupo JUSTE the exclusive license to commercialize RIZAPORT in Spain and a right of first refusal for additional territories. Under the term sheet, subject to remaining conditions, a definitive agreement is planned to be entered into within 60 days of the execution of the term sheet. Under the term sheet, RedHill and IntelGenx Corp. will receive an upfront payment and will be eligible to receive additional milestone payments upon achievement of certain predefined regulatory and commercial targets, as well as tiered royalties. Commercial launch in Spain is estimated to take place in the second half of 2017. RedHill also reported that a new U.S. formulation patent covering RIZAPORT was issued by the USPTO on April 5, 2016. The patent is valid until 2034.

On March 31, 2016, RedHill announced encouraging top-line interim results from its ongoing CEASE-MS Phase IIa proof-of-concept (PoC) clinical study evaluating fixed oral dose RHB-104 in patients treated for relapsing-remitting multiple sclerosis (RRMS). The ongoing CEASE-MS, single-arm, open-label study was designed with a series of exploratory endpoints to evaluate the safety and potential efficacy of fixed oral dose RHB-104 as an add-on therapy to interferon beta-1a in 18 patients treated for RRMS. Interim results after completion of the 24-week treatment period of the study demonstrated positive safety and clinical signals and support further clinical development based on encouraging preliminary data. Additional data reads are due at week 48 following a 24-week follow-up treatment period with interferon beta-1a, without RHB-104 add-on. The top-line interim results demonstrated an annualized relapse rate (ARR) at 24 weeks of 0.288 in the modified intent-to-treat (mITT) population and 0.0 in the per-protocol (PP) population, comparing favorably with previously reported pivotal studies of interferon beta-1a therapies Avonex (0.67)[2] and Rebif (0.87-0.91)[3]. 88% of the mITT patient population and 100% of the PP patient population were relapse free at 24 weeks, comparing favorably with previously reported pivotal data on the use of Rebif (75%) in comparison with Avonex (63%) as standalone first line therapies[4]; No patients in the CEASE-MS study relapsed after week 8 of treatment. With only a single active T1 post gadolinium lesion noted among all patients followed, combined unique active lesions (CUAs) – the primary outcome measure in the study – were almost entirely MRI T2 lesions; Although not powered for efficacy, a reduction in total MRI T2 lesion volume was observed at 24 weeks as compared to baseline, suggesting a decreased burden of disease and comparing favorably with previously reported Avonex[5] and Rebif[6] data.

On April 11, 2016, RedHill announced that it had initiated a randomized, double-blind, placebo-controlled, 2-arm parallel group Phase II clinical study in the U.S. evaluating the safety and efficacy of BEKINDA 12 mg in patients with diarrhea-predominant irritable bowel syndrome (IBS-D). The study is expected to be conducted in 12 clinical sites in the U.S. and to enroll 120 patients who will be randomized 60:40 to receive either BEKINDA 12 mg or a placebo, once daily, for a period of eight weeks. The primary endpoint for the study is the proportion of patients in each treatment group with response in stool consistency as compared to baseline, per FDA guidance definition. Secondary endpoints include the proportion of patients in each treatment group who are pain responders and the proportion of patients in each treatment group who are responders to the combined endpoints of stool consistency and pain, per FDA guidance definition.

On April 18, 2016, RedHill announced that it had concluded a positive Type B Meeting with the U.S. Food and Drug Administration (FDA) regarding the path to marketing approval of RHB-105 and the planned confirmatory Phase III study for the treatment of H. pylori infection. The FDA confirmed, subject to final minutes of the meeting, the planned two-arm, randomized, double-blind, active comparator design of the confirmatory Phase III study with RHB-105 for the treatment of H. pylori infection, expected to be initiated in the second half of 2016. Based on FDA feedback, and subject to successful completion, the planned confirmatory Phase III study, along with the successfully completed first Phase III study and data from a supportive PK program, are expected to support a U.S. New Drug Application (NDA) for RHB-105. The announcement followed the successful final results from the first Phase III clinical study with RHB-105 for the eradication of H. pylori (the ERADICATE Hp study) reported on March 8, 2016. The Phase III Clinical Study Report (CSR) confirmed the positive top-line results. The study successfully met its primary endpoint of superiority over historical standard-of-care (SoC) eradication rate levels of 70%, with high statistical significance (p < 0.001). The final results demonstrated 89.4% efficacy in eradicating H. pylori infection with RHB-105. RHB-105 has been granted Qualifying Infectious Disease Product (QIDP) designation by the FDA, providing a Fast-Track development pathway, as well as Priority Review status, potentially leading to a shorter review time by the FDA of a NDA, if filed. If approved, RHB-105 will also receive an additional five years of U.S. market exclusivity, in addition to the standard exclusivity period, for a total of 8 years of market exclusivity.

MEI Pharma Announces New Clinical Data from First-in-Human Study of ME-401, A Next Generation Oral PI3K Delta Inhibitor

On April 20, 2016 MEI Pharma, Inc. (Nasdaq: MEIP), an oncology company focused on the clinical development of novel therapies for cancer, announced new clinical data from a first-in-human study of MEI Pharma’s investigational drug candidate, ME-401, a next generation oral PI3K delta inhibitor (Press release, MEI Pharma, APR 20, 2016, View Source [SID:1234511147]). The data, presented today at the American Association for Cancer Research (AACR) (Free AACR Whitepaper) Annual Meeting in New Orleans, suggest that ME-401 has an excellent pharmacokinetic (PK) and pharmacodynamic (PD) profile and the potential for an improved therapeutic window compared to other PI3K delta inhibitors, including the approved drug idelalisib (marketed as Zydelig), with a half-life that supports once-daily dosing.

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A copy of the poster presentation, entitled, "Clinical Pharmacokinetics and Pharmacodynamics of ME-401, an Oral, Potent, and Selective Inhibitor of Phosphatidylinositol 3-Kinase P110δ, Following Single Ascending Administration to Healthy Volunteers," is now available at www.meipharma.com.

"PI3K delta is a class of drugs that has shown great promise in the treatment of B-cell malignancies, but with certain toxicities," said Daniel P. Gold, Ph.D., President and Chief Executive Officer of MEI Pharma. "We believe this provides an opportunity for a next-generation drug that can produce therapeutic responses at a safe, effective dose. Thus far, ME-401 has demonstrated all of the attributes we had hoped to see, including linear PK and on-target activity at very low concentrations. Now the goal of our upcoming Phase Ib study will be to show a large therapeutic window in cancer patients. We expect to dose the first patient in this study by the end of June and look forward to providing an update later this year."

The Phase I study was designed to assess the safety and tolerability of ME-401 after single ascending oral doses in healthy volunteers to select the most appropriate dose for further clinical evaluation. The open label study enrolled a total of 15 healthy volunteers in 10, 30, 60, 90 and 150 mg dose levels. ME-401 was well tolerated at all dose levels. One subject experienced two treatment-emergent adverse events that were considered drug-related: pain and headache, graded as mild, after a 60 mg dose.

The first-in-human study of ME-401 was conducted using Quotient Clinical’s Translational Pharmaceutics platform, which collected PK PD data immediately after each dose and allowed for real-time decision making and manufacturing between dose groups.

About ME-401

ME-401 (formerly PWT143) is an orally bioavailable, potent and selective inhibitor of phosphatidylinositol 3 kinase (PI3K) delta, a molecular target that has been shown to play a critical role in the proliferation and survival of certain hematologic cancer cells. ME-401 has a distinct chemical structure from other PI3K delta inhibitors, including idelalisib. Data presented at the American Society of Hematology (ASH) (Free ASH Whitepaper) Annual Meeting in December 2012 demonstrated that ME-401 has superior pre-clinical activity compared to idelalisib. In March 2015, the U.S. Food and Drug Administration approved an Investigational New Drug application for ME-401 in B-cell malignancies. MEI Pharma expects to initiate a Phase Ib dose-escalation study of ME-401 in patients with relapsed refractory chronic lymphocytic leukemia (CLL) or follicular non-Hodgkin’s lymphoma (fNHL) in June 2016. The study is expected to enroll 42-84 patients at approximately 10 sites, with a starting dose of 60 mg.

Molecular Pathways: Targeting the Cyclin D-CDK4/6 Axis for Cancer Treatment.

Cancer cells bypass normal controls over mitotic cell-cycle progression to achieve a deregulated state of proliferation. The retinoblastoma tumor suppressor protein (pRb) governs a key cell-cycle checkpoint that normally prevents G1-phase cells from entering S-phase in the absence of appropriate mitogenic signals. Cancer cells frequently overcome pRb-dependent growth suppression via constitutive phosphorylation and inactivation of pRb function by cyclin-dependent kinase (CDK) 4 or CDK6 partnered with D-type cyclins. Three selective CDK4/6 inhibitors, palbociclib (Ibrance; Pfizer), ribociclib (Novartis), and abemaciclib (Lilly), are in various stages of development in a variety of pRb-positive tumor types, including breast cancer, melanoma, liposarcoma, and non-small cell lung cancer. The emerging, positive clinical data obtained to date finally validate the two decades-old hypothesis that the cyclin D-CDK4/6 pathway is a rational target for cancer therapy.
©2015 American Association for Cancer Research (AACR) (Free AACR Whitepaper).

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DelMar Pharmaceuticals Announces New Data Supporting the Unique Anti-cancer Mechanism of VAL-083

On April 19, 2016 DelMar Pharmaceuticals, Inc. (OTCQX: DMPI) ("DelMar" and reported that its collaborators from the University of British Columbia’s Vancouver Prostate Center presented results of new research related to the anti-cancer mechanism of its lead anti-cancer product candidate, VAL-083 (dianhydrogalactitol) (Press release, DelMar Pharmaceuticals, APR 19, 2016, View Source [SID:1234511054]).

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Abstract #2985: "Molecular mechanisms of dianhydrogalactitol (VAL-083) in cancer treatment," is being presented during this morning’s "New Mechanisms of Anticancer Drug Action" session at the American Association of Cancer Research (AACR) (Free AACR Whitepaper) Annual Meeting in New Orleans.

Specifically,

VAL-083 displayed broad anti-tumor activity against lung and prostate cancer cells;
VAL-083 treatment causes rapid and durable DNA interstrand crosslinks leading to irreparable DNA double-strand breaks, S/G2 phase cell-cycle arrest and apoptosis in cancer cells; and
This new understanding of the molecular mechanisms underlying VAL-083’s anti-cancer activity offers support for effective combination therapies.
"These data indicate that the DNA-damaging cross-links resulting from VAL-083 treatment occur rapidly and, once formed, are not easily repaired by the cell," noted Dr. Dennis Brown, DelMar’s Chief Scientific Officer.

"Typically, a normal cell employs check-point control and DNA repair mechanisms to identify and remove DNA cross-links and double strand breaks such as those resulting from treatment with VAL-083. However, cancer cells, by their very nature tend to have mutations or deficiencies in these mechanisms that may allow VAL-083 mediated cross-links to persist resulting in irreparable and lethal damage to the tumor cell."

Jeffrey Bacha, DelMar’s chairman & CEO continued, "These findings are very exciting and continue to support our belief that VAL-083’s anti-cancer mechanism is unique. Understanding where in the cell cycle VAL-083 elicits its cancer-lethal activity provides guidance in considering combination therapies. This knowledge combined with our own and historical clinical data demonstrating activity against a number of tumors truly establishes a broad stage for the future clinical development of VAL-083."

About the Research:

VAL-083 (dianhydrogalactitol) is a bi-functional alkylating agent causing N7-guanine alkylation and inter-strand DNA crosslinks. VAL-083’s cytotoxic activity is independent of MGMT-expression in various cancer cells and cancer stem cells, suggesting a mechanism that is distinct from that of other alkylating agents. Preclinical and clinical trial data suggest that VAL-083 may have effects in treating various cancers, including lung, brain, cervical, ovarian tumors, and leukemia. However, the detailed molecular mechanisms mediating VAL-083 sensitivity or resistance in cancer have been unclear.

This research was undertaken to investigate the signaling events responsible for VAL-083’s robust activity against cancer.

Crystal violet proliferation assays were performed to assess VAL-083 sensitivity in a variety of cancer cell lines. Propidium iodide (PI) staining and immunofluorescent analyses were used to evaluate cell cycle phases. Western blots were employed to investigate DNA damage response induced by VAL-083 treatment.

Pulse (1 hour) treatment with VAL-083 activated DNA damage signaling pathway as demonstrated by expression of phospho-ATM (S1981), phospho-Chk2 (T68), phospho-RPA32 (S33) and ɣH2A.X which persisted for 24 – 48 hours after removal of VAL-083 from the medium. Specifically, VAL-083 treatment led to long-lasting cell cycle arrest at S/G2 phase of the cell cycle. Additionally, DNA double-strand break signals such as increased levels of ɣH2A.X continued to accumulate at 72 hours following treatment of cancer cells with VAL-083, demonstrating irreparable damage to the tumor cell.

About VAL-083

VAL-083 is a "first-in-class," small-molecule chemotherapeutic. In more than 40 Phase I and II clinical studies sponsored by the U.S. National Cancer Institute, VAL-083 demonstrated clinical activity against a range of cancers including lung, brain, cervical, ovarian tumors and leukemia both as a single-agent and in combination with other treatments. VAL-083 is approved in China for the treatment of chronic myelogenous leukemia (CML) and lung cancer, and has received orphan drug designation in Europe and the U.S. for the treatment of malignant gliomas. DelMar recently announced that the FDA’s Office of Orphan Products had also granted an orphan designation to VAL-083 for the treatment of medulloblastoma.

DelMar has demonstrated that VAL-083’s anti-tumor activity is unaffected by the expression of MGMT, a DNA repair enzyme that is implicated in chemotherapy resistance and poor outcomes in GBM patients following standard front-line treatment with Temodar (temozolomide).

DelMar has been conducting a Phase I/II clinical trial in GBM patients whose tumors have progressed following standard treatment with temozolomide, radiotherapy, bevacizumab (Avastin) and a range of salvage therapies at five clinical centers in the United States: Mayo Clinic (Rochester, MN); UCSF (San Francisco, CA) and three centers associated with the Sarah Cannon Cancer Research Institute (Nashville, TN, Sarasota, FL and Denver, CO).

Interim data from the ongoing Phase I/II clinical trial were presented today at the American Association of Cancer Research Annual Meeting (abstract #CT074). Results to date support the potential of a VAL-083 to offer a clinically meaningful survival benefit and a promising new treatment option for GBM patients who have failed or are unlikely to respond to currently available chemotherapeutic regimens. DelMar plans to discuss a proposed Phase III protocol with the FDA in the coming months.