New Preclinical Data for Novel Immunotherapy Bispecific Candidate ALG.APV-527 presented by Alligator Bioscience and Aptevo Therapeutics

On May 8, 2018 Alligator Bioscience (Nasdaq Stockholm: ATORX), a biotechnology company developing antibody-based pharmaceuticals for tumor-directed immunotherapy, and Aptevo Therapeutics Inc. (Nasdaq: APVO), a biotechnology company focused on developing novel immuno-oncology and hematology therapeutics, reported the presentation of new preclinical data supporting ALG.APV-527 as a promising new immunotherapeutic candidate for the treatment of a variety of 5T4-expressing solid tumors (Press release, Alligator Bioscience, MAY 8, 2018, View Source [SID1234538677]).

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ALG.APV-527 is designed to simultaneously target 5T4 and the co-stimulatory receptor 4-1BB (CD137) to promote potent, tumor-directed immune T-cell activation. 5T4 is a well-defined tumor antigen expressed on many different types of malignancies including, non-small cell lung, renal, pancreas, prostate, breast, colorectal, gastric, ovarian and cervical cancers. Conversely, 5T4 has limited expression on normal tissues, making it an attractive target for cancer immunotherapy.

New ALG.APV-527 preclinical data show that ALG.APV-527 has the potential to selectively activate and enhance tumor specific T cell responses at the tumor site without triggering systemic immune activation. Notably, the preclinical in vitro and in vivo data show that ALG.APV-527:

Stimulates increased T cell activation in the presence of 5T4-expressing cells
Localizes to the site of 5T4 positive tumors in an in vivo melanoma tumor model
Inhibits tumor growth in a 5T4 expressing in vivo human colon carcinoma model
Has an extended, antibody-like serum half-life of 9 days in an experimental model
The data were recently presented at the PEGS Summit 2018 and American Association of Immunologists (AAI) annual meeting and will be presented next week at the Annual Meeting of Cancer Immunotherapy (CIMT) (Free CIMT Whitepaper).

"Taken together, the accumulating preclinical data package for ALG.APV-527 support its potential to provide effective tumor-directed immune activation with reduced systemic side effects. We are continuing to advance this candidate and look forward to commencing clinical development in 2019," said Christina Furebring, Senior Vice President Research at Alligator.

"Our collaboration with Alligator Bioscience continues to yield encouraging data supporting the advantages of this novel pathway for targeted immunotherapy of cancer," said Jane Gross, Ph.D., Chief Scientific Officer for Aptevo. "As a first-in-class molecule, ALG.APV-527 showcases the versatility of our ADAPTIR platform in generating bispecific antibodies with unique mechanisms of action and a therapeutic profile that is more consistent with traditional antibodies, including an extended half-life, desirable antibody-like manufacturing characteristics and increased potency and stability."

Aptevo and Alligator believe that the precise targeting of 4-1BB within the tumor microenvironment can overcome some of the limitations seen with other 4-1BB therapies. ALG.APV-527 employs a novel mechanism of action, 4-1BB x 5T4 binding, to direct the therapeutic immune response towards the tumor, thereby potentially reducing the harmful side effects of systemic immune stimulation while providing a strong tumor directed immune activation.

About ALG.APV-527
ALG.APV-527 is a bispecific antibody (4-1BB x 5T4) intended for tumor-directed treatment of solid cancers. ALG.APV-527 was built using Aptevo’s ADAPTIR bispecific platform and combines binding domains sourced from the ALLIGATOR-GOLD human scFV library. The ALG.APV-527 bispecific antibody consists of two parts, one part activating tumor-specific T cells through the co-stimulatory receptor 4-1BB, the other part binding to the 5T4 protein expressed on the surface of tumor cells. This enables the immune-activating effect of ALG.APV-527 to be directed specifically to the tumor and not against normal tissue.

FAK to the future: Innate breathes new life into CTX FAK assets

On May 8, 2018 Cancer Therapeutics CRC (CTX), a small molecule oncology drug discovery and development group partnered with some of Australia’s pre-eminent medical research institutions, is pleased to announce two Focal Adhesion Kinase (FAK) targeting drug candidates originally developed by CTX have been acquired by Innate Immunotherapeutics Ltd (Innate) through its acquisition of Amplia Therapeutics Pty Ltd (Amplia) (Press release, Cancer Therapeutics CRC, MAY 8, 2018, View Source [SID1234529457]).

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FAK is emerging as a promising target in both combination cancer therapy and fibrosis.

Amplia had previously in-licensed the two FAK targeting drug candidates (currently referred to as AMP886 and AMP945) from Cancer Research Technology Limited, a wholly owned subsidiary of Cancer Research UK. The drug candidates were originally developed by CTX.

All the shares in Amplia, a privately owned Melbourne-based biopharmaceutical company, have now been acquired by ASX listed Innate in exchange for new ordinary shares issued by Innate. The previous shareholders of Amplia now own 45% of the total issued capital of Innate. The Board and management of Innate now includes representatives from the Amplia team.

"Successful development of these potentially beneficial drugs should eventually see benefits flow back to our original partners." Said CTX Advisor, Dr Warwick Tong. "CTX was established to translate good research, provide benefits for patients and see commercial rewards flow back to the biotechnology sector in Australia.

According to Innate director Dr Robert Peach, "there have been multiple independent high-quality publications suggesting that the successful targeting of FAK could increase the efficacy of other immuno-oncology therapies in tumours where to date they have limited anti-tumour effects as single agents". Dr Robert Peach, who led the Company’s technical review of the drug candidates said that "CTx have done an excellent job selecting and characterizing AMP886 and AMP945 before licensing them to Cancer Research Technology Limited."

CTX will stay closely involved with the development of these assets. Dr Mark Devlin, CTX Director of Translation Biology, has been appointed as a Scientific Advisor to Innate.

10-Q – Quarterly report [Sections 13 or 15(d)]

Corcept Therapeutics has filed a 10-Q – Quarterly report [Sections 13 or 15(d)] with the U.S. Securities and Exchange Commission (Filing, 10-Q, Corcept Therapeutics, 2018, MAY 8, 2018, View Source [SID1234527942]).

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10-Q – Quarterly report [Sections 13 or 15(d)]

AnaptysBio has filed a 10-Q – Quarterly report [Sections 13 or 15(d)] with the U.S. Securities and Exchange Commission (Filing, 10-Q, AnaptysBio, 2018, MAY 8, 2018, View Source [SID1234527562]).

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DYNAVAX REPORTS FIRST QUARTER 2018 FINANCIAL RESULTS

On May 8, 2018 Dynavax Technologies Corporation (NASDAQ: DVAX) reported financial results for the first quarter ended March 31, 2018 (Press release, Dynavax Technologies, MAY 8, 2018, View Source [SID1234526366]). The net loss for the quarter ended March 31, 2018, was $39.0 million, or $0.63 per share, compared to $25.3 million, or $0.60 per share, for the quarter ended March 31, 2017. Cash, cash equivalents and marketable securities totaled $250.8 million at March 31, 2018.

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Recent Highlights

HEPLISAV-B [Hepatitis B Vaccine, Recombinant (Adjuvanted)] CDC’s Advisory Committee on Immunization Practices’ (ACIP) recommendation of HEPLISAV-B published in Morbidity and Mortality Weekly Report (MMWR) supports payer coverage, removing a major barrier for adoption

100% of Medicare-insured lives, 74% of commercially-insured lives, and 60% of lives under state Medicaid plans have HEPLISAV-B specific Current Procedural Terminology (CPT) code loaded, are referencing the correct price, and have confirmed provider claims will be reimbursed. These coverage metrics have been achieved just two weeks after the publication of the MMWR

In first 60 days following sales force launch in late February, the field sales team met with two-thirds of targeted key accounts, representing over half of addressable market

Immuno-Oncology

Data abstract for Phase 1b/2 study investigating SD-101 in combination with KEYTRUDA in advanced melanoma selected for Poster Discussion Session at 2018 American Society of Clinical Oncology (ASCO) (Free ASCO Whitepaper) Annual Meeting

Data from ongoing Phase 1b/2 study of SD-101 and KEYTRUDA combination therapy presented at the 2018 American Association for Cancer Research (AACR) (Free AACR Whitepaper) Annual Meeting

Meaningful response in advanced head and neck squamous cell carcinoma – overall response rate of 33% (6 out of 18) (38% among patients who received at least one scan on study)
Well-tolerated in advanced melanoma, showed no increase in frequency of immune-related adverse events over individual monotherapies, nor evidence of a unique safety signal; 86% (6 out of 7) of initial responses naïve to anti-PD-1/L1 treatment were ongoing after a median of 18 months of follow up

Financials

$250.8 million in cash, cash equivalents and marketable securities at end of first quarter, with $75 million available from February 2018 term loan agreement


Funds commercialization of HEPLISAV-B to time of expected positive cash flow and supports further immuno-oncology clinical research

"We have made significant progress since the beginning of the year," said Eddie Gray, Chief Executive Officer. "Our sales force has begun engaging with most of our larger potential customers. We are delighted by the level of initial interest reinforcing our view that HEPLISAV-B will become the standard of care for adult hepatitis-B vaccination and reach a goal of obtaining positive cash flow by the end of 2019."

"In addition, we see substantial potential upside from our immuno-oncology programs. SD-101 has been shown to generate antitumor activity in three tumor types while being well tolerated. We have funding to continue supporting new clinical trials and advancement of SD-101 into a registrational study in 2018," Mr. Gray concluded.

Additional Financial Results

Net product revenue was $0.2 million for the quarter ended March 31, 2018, which consists of sales of HEPLISAV-B in the U.S. Product Revenue from sales is recorded at the net sales price which includes estimates of product returns, chargebacks, discounts and other fees.

Cost of sales, product was $0.2 million for the quarter ended March 31, 2018 and consists of certain fill, finish and fixed overhead costs for HEPLISAV-B incurred after FDA approval.

Cost of sales, amortization of intangible assets was $2.4 million for the quarter ended March 31, 2018 and consists of amortization of the intangible asset recorded as a result of milestone and sublicense payments relating to HEPLISAV-B.

Research and development expenses for the quarter ended March 31, 2018 and 2017, were $19.0 million and $16.3 million, respectively. The increase in 2018 reflects increased compensation and related personnel costs related to the ongoing development of SD-101, DV281 and earlier stage oncology programs, costs associated with resuming operating activities at our Dusseldorf production facility and costs associated with manufacturing of pre-filled syringes prior to regulatory approval.

Selling, general and administrative expenses for the quarter ended March 31, 2018 and 2017, were $16.9 million and $6.5 million, respectively. The increase is due to an overall increase in HEPLISAV-B sales, marketing and commercial activities, including full-deployment of a contract sales force, post-marketing studies and consultants for commercial development services.

Conference Call and Webcast Information

Dynavax will hold a conference call today at 4:30pm ET/1:30pm PT. To access the call, participants must dial (866) 548-4713 in the U.S. or (323) 794-2093 internationally, and use the conference ID 8635193. The live call will be webcast and can be accessed in the "Investors and Media" section of the company’s website at www.dynavax.com. A replay of the webcast will be available for 30 days following the live event.

A replay of the conference call will be available for two weeks and can be accessed by dialing (844) 512-2921 in the U.S. or (412) 317-6671 internationally. The conference ID for the replay will be 8635193.

About Hepatitis B

Hepatitis B is a viral disease of the liver that can become chronic and lead to cirrhosis, liver cancer and death. The hepatitis B virus is 50 to 100 times more infectious than HIV,i and transmission is on the rise. In 2015, new cases of acute hepatitis B increased by more than 20 percent nationally.ii There is no cure for hepatitis B, but effective vaccination can prevent the disease.

In adults, hepatitis B is spread through contact with infected blood and through unprotected sex with an infected person. The CDC recommends vaccination for those at high risk for infection due to their jobs, lifestyle, living situations and travel to certain areas.iii Because people with diabetes are particularly vulnerable to infection, the CDC recommends vaccination for adults age 19 to 59 with diabetes as soon as possible after their diagnosis, and for people age 60 and older with diabetes at their physician’s discretion.iv Approximately 20 million U.S. adults have diabetes, and 1.5 million new cases of diabetes are diagnosed each year.v

About HEPLISAV-B

HEPLISAV-B is an adult hepatitis B vaccine that combines hepatitis B surface antigen with Dynavax’s proprietary Toll-like Receptor (TLR) 9 agonist to enhance the immune response. Dynavax has worldwide commercial rights to HEPLISAV-B.

Indication and Use

HEPLISAV-B is indicated for prevention of infection caused by all known subtypes of hepatitis B virus in adults age 18 years and older.

Important Safety Information (ISI)

Do not administer HEPLISAV-B to individuals with a history of severe allergic reaction (e.g., anaphylaxis) after a previous dose of any hepatitis B vaccine or to any component of HEPLISAV-B, including yeast.

Appropriate medical treatment and supervision must be available to manage possible anaphylactic reactions following administration of HEPLISAV-B.

Immunocompromised persons, including individuals receiving immunosuppressant therapy, may have a diminished immune response to HEPLISAV-B.

Hepatitis B has a long incubation period. HEPLISAV-B may not prevent hepatitis B infection in individuals who have an unrecognized hepatitis B infection at the time of vaccine administration.

The most common patient reported adverse reactions reported within 7 days of vaccination were injection site pain (23% to 39%), fatigue (11% to 17%) and headache (8% to 17%).

For full Prescribing Information for HEPLISAV-B, click here.

About MEL-01 (KEYNOTE-184)

The dose-escalation and expansion study of SD-101 in combination with KEYTRUDA includes patients with histologically or cytologically confirmed unresectable Stage IIIc/IV melanoma. The primary endpoints of the trial are MTD and evaluation of the safety of intratumoral SD-101 in combination with KEYTRUDA. In addition, the trial is investigating response as assessed by the investigator according to

RECIST v1.1, biomarker assessments and duration of response. Patients previously treated with anti-PD-1 and other immunotherapies are included.

About SD-101

SD-101, the Company’s lead clinical candidate, is a proprietary, second-generation, Toll-like receptor 9 (TLR9) agonist CpG-C class oligodeoxynucleotide. Dynavax is evaluating this intratumoral TLR9 agonist in several clinical studies to assess its safety and activity, including a Phase 2 study in combination with KEYTRUDA (pembrolizumab), an anti-PD-1 therapy, in patients with metastatic melanoma and in patients with head and neck squamous cell cancer, in a clinical collaboration with Merck. Dynavax maintains all commercial rights to SD-101.

About DV281

DV281 is Dynavax’s proprietary investigational TLR9 agonist designed specifically for focused delivery to primary lung tumors and lung metastases. DV281 is similar in biological activity and mechanism of action to Dynavax’s Phase 2 immunotherapy candidate, SD-101, but has been optimized for administration as an aerosol. Both SD-101 and DV281 are designed to activate plasmacytoid dendritic cells and stimulate T cells specific for antigens released from dying tumor cells. TLR9 agonists such as DV281 and SD-101 have been shown to stimulate potent Type 1 interferon induction along with maturation of dendritic cells to effective antigen-presenting cells; both activities are important for the induction of effective anti-tumor immunity. Dynavax has initiated dosing in a phase 1B dose escalation clinical trial of DV281 in patients with non-small cell lung cancer.