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Polaris Group Announces Results of a Phase 1 Clinical Study with its Lead Therapeutic Candidate ADI-PEG 20 in Combination with Pembrolizumab for Advanced Solid Tumors

On June 4, 2018 At the American Society Clinical Oncology’s 2018 annual meeting, scientists from National Institute of Cancer Research Taiwan reported results from a phase 1 clinical study, showing that Polaris lead therapeutic candidate ADI‑PEG 20 in combination with pembrolizumab has activity for advanced solid tumors (Press release, Polaris Pharmaceuticals, JUN 4, 2018, View Source [SID1234527208]).

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The study results showed that ADI‑PEG 20 could be safely combined with pembrolizumab at its full dose (200 mg) for the treatment of advanced solid tumors. In the dose escalation cohort, two patients, one with thymus cancer and one with nasopharyngeal carcinoma, both in the fourth-line systemic treatment, had a partial response (PR). The main toxicity has been transient and manageable neutropenia. The study is currently enrolling patients in two recommended phase 2 dose cohorts: one for advanced cancers with low PD-L1 expression and one for head and neck cancer. Overall, the study has an objective response rate (ORR) of 27.8% (5/18) in evaluable patients at this time.

In the advanced cancers with low PD-L1 expression cohort, only patients with less than 50% PD-L1 expression are eligible for entry. Of the first 8 evaluable patients in this group, the current ORR is 37.5% as 3 PRs have been observed in heavily pre-treated patients: a third-line mucosal melanoma, a fifth-line cholangiocarcinoma and a fourth-line esophageal carcinoma. These preliminary results suggest that ADI-PEG 20 could potentially be synergistic with program death compounds, and various combinations that include ADI‑PEG 20 and other immunotherapies should be further explored in multiple cancer types.

"Preclinical data indicated that ADI‑PEG 20 could up-regulate PD-L1 expression, turning immune ‘cold’ tumors to express PD-L1 and thus more receptive to programmed death inhibition with agents such as pembrolizumab. We are gratified to see this same scenario occur in patients," said John Bomalaski, M.D., Executive Vice President, Medical Affairs, of Polaris. "Based on this encouraging data, we now have multiple trials planned with ADI‑PEG 20 and various checkpoint inhibitors, including combinations with both programmed death and CTLA-4 inhibitors. The enhancement of sensitivity to programmed death inhibition, combined with ADI-PEG 20’s efficacy, tolerability, and different mechanism of action make it an ideal agent for incorporation into checkpoint agent therapy," he added.

About ADI-PEG 20

ADI‑PEG 20 is a biologic being developed by Polaris Group to treat cancers carrying a major metabolic defect that renders them unable to internally synthesize arginine. Because arginine is essential for protein synthesis and survival of cells, these cancer cells become dependent upon the external supply of arginine to survive and grow. ADI‑PEG 20 is designed to deplete the external supply of arginine, causing arginine-dependent cancer cells to die while leaving the patient’s normal cells unharmed. Multiple cancers have been reported to have a high degree of arginine-dependency and can potentially be treated with ADI‑PEG 20.

HUYA Biosciences International expanded oncology pipeline includes combination with checkpoint inhibitor for solid tumors

On June 4, 2018 HUYA Bioscience International (HUYA), the leader in accelerating global development of China’s pharmaceutical innovations, reported it is at a key stage in the company’s development of HBI-8000, HUYA’s lead novel epigenetic drug with important immunomodulatory properties (Press release, HUYA Bioscience, JUN 4, 2018, View Source [SID1234527194]). HUYA is conducting a Phase 2 trial of HBI-8000 in the US, investigating efficacy and safety in combination with nivolumab for the treatment of solid tumors. The ongoing Phase 2 study is an open label study of patients with advanced renal cell cancer, non-small cell lung cancer and melanoma.

"We are at an important milestone in the development of HBI-8000 as we test the compound’s ability to improve the clinical benefit of checkpoint inhibitors for the treatment of solid tumors" said Dr Mireille Gillings, HUYA’s CEO and Executive Chair. "The emerging data for the combination are encouraging, leading to our ultimate goal which is to harness the demonstrated immunomodulatory properties of HBI-8000 to improve the outcome for patients treated with immunological therapies."

HBI-8000 is a member of the benzamide class of histone deacetylase (HDAC) inhibitors designed to block the catalytic pocket of Class I HDACs. Recent data show greatly expanded immunomodulatory properties which explain in greater depth the strong results now being seen in the clinic. HBI-8000 is an orally bioavailable, low-nanomolar inhibitor of cancer-associated HDAC enzymes with favorable pharmacology and safety profiles. Studies with human-derived tumor cell lines and animal tumor models have demonstrated that HBI-8000 inhibits the growth of many tumors via multiple mechanisms of action, including epigenetic regulation of tumor cell growth and apoptosis, immunomodulatory effects regulating antitumor activity, as well as repression of genes associated with drug resistance. HBI-8000 is approved in China for the treatment of peripheral T-cell lymphoma.

Dr Bob Goodenow, President, HUYA, said "We’ve targeted a significant improvement for the combination relative to nivolumab’s overall response rate, disease control rate and other clinical parameters to proceed to registration studies. Our results to date exceed expectations and clearly demonstrate the combination should be tested in a pivotal setting for the clinical benefit observed in our Phase 2 trial."

Corporate slide presentation of Selecta Biosciences, Inc. dated June 2018

On June 4, 2018 Selecta Biosciences, Inc. (the "Company") presents and/or distributes to the investment community at various industry and other conferences slide presentations to provide updates and summaries of its business (Presentation, Selecta Biosciences, JUN 4, 2018, View Source [SID1234527193]).

Progenics Pharmaceuticals Announces Presentation of Updated Data from the Pivotal Trial of AZEDRA® (iobenguane I 131) at the 2018 American Society of Clinical Oncology (ASCO) Annual Meeting

On June 4, 2018 Progenics Pharmaceuticals, Inc. (Nasdaq:PGNX), an oncology company developing innovative medicines and other products for targeting and treating cancer, reported updated overall survival data from the Company’s pivotal Phase 2 trial of its targeted, high-specific-activity radiotherapeutic candidate, AZEDRA (iobenguane I 131), in patients with malignant, recurrent, or unresectable pheochromocytoma and paraganglioma (pheo/para), which is the subject of an oral presentation at the 2018 American Society of Clinical Oncology (ASCO) (Free ASCO Whitepaper) Annual Meeting in Chicago, Illinois (Press release, Progenics Pharmaceuticals, JUN 4, 2018, View Source [SID1234527185]).

"This pivotal study, the largest prospective clinical trial in pheochromocytoma and paraganglioma to date, has demonstrated multiple clinical benefits of AZEDRA treatment, which has translated into impressive overall survival data in this highly pre-treated and advanced patient population," said Dr. Daniel Pryma, Associate Professor of Radiology & Radiation Oncology and Chief, Division of Nuclear Medicine & Clinical Molecular Imaging at the Perelman School of Medicine at the University of Pennsylvania, the trial’s lead investigator. "The primary cause of death in pheo/para patients is tumor progression. In this study, 98% of patients who received two doses experienced stable disease or better as measured by Response Evaluation Criteria In Solid Tumors (RECIST). In addition, 30% of pheo/para patients die from complications due to catecholamine-associated hypertension, while patients treated with AZEDRA were able to achieve control of catecholamine-associated hypertension and a sustained reduction of antihypertensive medications. These benefits were correlated with a robust tumor biomarker response. With no approved therapies in the U.S. for pheo and para, AZEDRA has the potential to offer a meaningful treatment option for patients with these life-threatening tumors."

Dr. Pryma will review the data today in an oral presentation entitled, "AZEDRA (iobenguane I 131) in patients with malignant, recurrent and/or unresectable pheochromocytoma or paraganglioma (PPGL): Updated efficacy and safety results from a multi-center, open-label, pivotal phase 2 study."

The pivotal phase 2 open-label, multi-center trial was conducted under a Special Protocol Assessment (SPA) with the U.S. Food and Drug Administration (FDA). The trial met the primary endpoint evaluating the proportion of pheochromocytoma and paraganglioma patients who achieved a 50% or greater reduction of all antihypertensive medication for at least six months, and showed favorable results from a key secondary endpoint evaluating the proportion of patients with overall tumor response as measured by RECIST. 92.2% of patients treated with at least one therapeutic dose of AZEDRA achieved a confirmed partial response or stable disease by 12 months. AZEDRA was also shown to be safe and generally well tolerated.

Median overall survival time as of December 4, 2017 was 37 months from first AZEDRA therapeutic dosing in the overall study population, and 44 months among patients who received two therapeutic doses, compared to 18 months among patients who received only one therapeutic dose. The study data also suggest the potential for AZEDRA to extend survival in patients with liver or lung metastasis, which is generally considered in the literature to be less than 24 months. In this study, median survival time was similar in patients with lung or liver metastasis compared to those without (43 vs. 41 months). Long term follow-up continues.

"These data, which are the basis of our New Drug Application, show that AZEDRA has the potential to address the dual goals of therapy in pheo and para – to reduce the cardiovascular symptoms associated with the excess hormone production, and to produce favorable tumor responses," said Mark Baker, Chief Executive Officer of Progenics. "We are eagerly anticipating the FDA’s decision on AZEDRA, as we believe it has the potential to be a breakthrough treatment option for patients with these deadly, ultra-rare neuroendocrine cancers."

About AZEDRA

AZEDRA (iobenguane I 131) is a high-specific-activity radiotherapeutic product candidate in development as a treatment for malignant, recurrent, or unresectable pheochromocytoma and paraganglioma, which are rare neuroendocrine tumors of neural crest origin. AZEDRA is a substrate for norepinephrine reuptake transporter, which is highly expressed on the cell surface of neuroendocrine tumors. AZEDRA has been granted Orphan Drug designation, Fast Track status, and Breakthrough Therapy designation in the U.S. Under a SPA agreement with the FDA, a Phase 2 pivotal study has been completed in patients with malignant, recurrent, or unresectable pheochromocytoma and paraganglioma. The FDA granted Priority Review of Progenics’ New Drug Application and has set an action date of July 30, 2018 under the Prescription Drug User Fee Act. There are currently no FDA-approved therapies for the treatment of these ultra-rare diseases.

About Pheochromocytoma and Paraganglioma

Pheochromocytoma and paraganglioma are rare neuroendocrine tumors that arise from cells of the autonomic nervous system. Pheochromocytoma forms in the adrenal medulla, whereas paragangliomas form outside the adrenal gland. Standard treatment options for these tumors include surgery, palliative therapy and symptom management. Pheochromocytoma and paraganglioma tumors frequently secrete high levels of hormones that can lead to life-threatening hypertension, heart failure, and stroke in these patients. Malignant and recurrent pheochromocytoma and paraganglioma may result in unresectable disease with a poor prognosis, representing a significant management challenge with very limited treatment options and no approved anti-tumor therapies.

Oncolytics Biotech® Announces Poster Presentation Demonstrating the Ability of REOLYSIN® to Promote and Predict Response to Checkpoint Inhibitors
at ASCO 2018 Annual Meeting

On June 4, 2018 Oncolytics Biotech Inc. (TSX: ONC) (NASDAQ: ONCY), currently developing REOLYSIN (pelareorep), an intravenously delivered immuno-oncolytic virus turning cold tumors hot, reported a key poster presentation at the American Society of Clinical Oncology (ASCO) (Free ASCO Whitepaper) 2018 Annual Meeting (Press release, Oncolytics Biotech, JUN 4, 2018, View Source [SID1234527183]). The meeting takes place from June 1 – 5, 2018 at McCormick Place, Chicago, IL.

"These results demonstrate that pelareorep promotes the expression of gene signatures predictive of a response to immunotherapy in breast cancer and hepatocellular carcinoma." said Matt Coffey, President and CEO of Oncolytics Biotech. "The tumor inflammation promoting effects in breast cancer models provide a compelling explanation for the significant overall survival benefit in hormone receptor positive metastatic breast cancer patients in our phase 2, IND 213, study and we believe this will continue to drive interest in our breast cancer program."

Highlights of the poster include:

• Pelareorep promotes expression of gene signatures that are predictive of response to checkpoint inhibitors in select cell lines
• HCC – hepatocellular carcinoma
• HR+ BC – hormone receptor positive breast cancer
• Pronounced tumor inflammatory effects of pelareorep in HR+ BC cells may explain the prominent increase in overall survival in a previous phase 2 randomized clinical study in HR+ mBC patients treated with pelareorep and may render this large breast cancer population susceptible to conventional immunotherapy regimes
• Results warrant further investigation of pelareorep in combination with checkpoint inhibitors

Presenter & Lead Author: Grey A. Wilkinson PhD, Oncolytics Scientist, Translational Medicine
Presentation Title: Pelareorep to promote the expression of a IFN-gamma-related gene signature that predicts response to checkpoint blockade therapy
Session Title: Developmental Therapeutics – Immunotherapy
Location: McCormick Place: Hall A
Abstract number: 3089
Poster Board #: 303
Date/Time: 6/4/2018; 8:00 AM-11:30 AM

The complete poster can be found online on the company website at View Source

About REOLYSIN/Pelareorep

REOLYSIN, also known as pelareorep, is a non-pathogenic, proprietary isolate of the unmodified reovirus: a first-in-class intravenously delivered immuno-oncolytic virus for the treatment of solid tumors and hematological malignancies. The compound induces selective tumor lysis and promotes an inflamed tumor phenotype through innate and adaptive immune responses to treat a variety of cancers.