Assembly Biosciences reports chronic hepatitis data, shares jump

Assembly Biosciences announces presentation of ABI-H0731, ABI-H2158 data

Assembly Biosciences (ASMB) announced that data on its lead HBV core inhibitor candidates, ABI-H0731 and ABI-H2158 for the treatment of chronic HBV will be featured in a late-breaking poster session during the American Association for the Study of Liver Diseases Annual Meeting.

Shares jump on hepatitis data, Stockwinners

A hepatitis B infection can result in either an acute infection or a chronic infection. When a person is first infected with the hepatitis B virus, it is called an “acute infection” (or a new infection). Most healthy adults that are infected do not have any symptoms and are able to get rid of the virus without any problems. Some adults are unable to get rid of the virus after six months and they are diagnosed as having a “chronic infection.”

Title: Continued Therapy with ABI-H0731+Nrtl Results in Sequential Reduction/Loss of HBV DNA, HBV RNA, HBeAg, HBcrAg and HBsAg in HBeAg-Positive Patients.

Abstract Summary: Final results from Phase 2a are reported for HBeAg+ patients with chronic HBV infection treated with 731+Nrtl for 24 weeks.

In Study 202, greater mean log10 declines in HBV DNA and RNA were achieved with 731+Nrtl versus entecavir alone.

In Study 201, the proportion of patients on 731+Nrtl versus Nrtl alone achieving DNA target not detected was 69% vs 0%, and the proportion of patients achieving RNA less than35 U/mL whose RNA was greater than or equal to35 U/mL at baseline was 52% vs 0% respectively.

In Study 211, there are 64 HBeAg+ patients currently on extended treatment beyond 24 weeks. Among the 27 HBeAg+ patients receiving 731+Nrtl in Study 201, 41% have now achieved DNA TND along with RNA less than35 U/mL and HBeAg less than1 IU/mL.

At their last time point, Study 202 patients now in Study 211 have demonstrated mean DNA and RNA declines of 6.1 and 3.0 logs, respectively, with observed mean log changes of greater than or equal to 0.6 for HBeAg, greater than 0.8 log for HBcrAg and greater than or equal to 0.4 log for HBsAg.

731 continues to exhibit a favorable safety and tolerability profile in patients treated for up to 1 year, with only mild/moderate adverse events and lab abnormalities, and only a single discontinuation due to a Grade 1 rash.

The combination of 731+NrtI results in faster and deeper declines in HBV DNA and RNA than NrtI alone, as well as subsequent declines in the surrogate markers of cccDNA predictive of cccDNA pool depletion, and HBsAg.

A Visual Guide to Hepatitis, Stockwinners

The emergent data supports the continued development of 731.

Abstract data are as of the time of submission; the poster is expected to include updated safety and efficacy results. Title: The Second-Generation Hepatitis B Virus Core Inhibitor ABI-H2158 is Associated with Potent Antiviral Activity in a 14-Day Monotherapy Study in HBeAg-positive Patients with Chronic Hepatitis B.

Abstract Summary: The Phase 1b study is enrolling sequential cohorts of 9 patients and each cohort will be randomized to receive 2158 or placebo QD for 14 days in a blinded manner.

Dosing in the 1st cohort has been completed. In patients receiving 2158, mean declines from Baseline to Day 15 in HBV DNA and RNA levels were 2.3 log10 and 2.1 log10 IU/mL respectively.

No serious AEs, dose limiting toxicities or premature discontinuations were reported.

Three patients reported a total of 5 mild, drug-related AEs that recovered without intervention; dizziness, fatigue, rash, headache and upper abdominal pain.

Treatment emergent laboratory abnormalities were infrequent, mild and transient, with no ALT elevations Grade greater than or equal to 1 in severity.

Day 14 plasma 2158 Cmax and AUC0-24hr were 3,390 ng/mL and 46,100 hr*ng/mL, respectively.

Results from the initial 100 mg low dose of ABI-H2158 cohort demonstrated potent antiviral activity, a favourable safety profile when administered for 14 days, and support once daily dosing in CHB patients.

Zogenix tumbles on FDA action

Zogenix gets refusal to file letter from FDA on Fintepla NDA

Zogenix gets refusal to file letter from FDA on Fintepla NDA , Stockwinners

Zogenix (ZGNX) announced that it received a Refusal to File, RTF, letter from the U.S. Food and Drug Administration regarding its New Drug Application for FINTEPLA, for the treatment of seizures associated with Dravet syndrome.

Dravet syndrome is a rare, catastrophic, lifelong form of epilepsy that begins in the first year of life with frequent and/or prolonged seizures. Previously known as Severe Myoclonic Epilepsy of Infancy (SMEI), it affects 1:15,700 individuals, 80% of whom have a mutation in their SCN1A gene.

Upon its preliminary review, the FDA determined that the NDA, submitted on February 5, 2019, was not sufficiently complete to permit a substantive review.

In the letter, the FDA cited two reasons for the RTF decision: first, certain non-clinical studies were not submitted to allow assessment of the chronic administration of fenfluramine; and, second, the application contained an incorrect version of a clinical dataset, which prevented the completion of the review process that is necessary to support the filing of the NDA.

The FDA has not requested or recommended additional clinical efficacy or safety studies.

The company will seek immediate guidance, including a Type A meeting with the FDA, to clarify and respond to the issues identified in the RTF letter.

“We remain highly confident in FINTEPLA’s clinical profile demonstrated in the Phase 3 program in Dravet syndrome and are committed to advancing the product candidate as a potential new treatment option for this and other rare and often catastrophic epileptic encephalopathies,” said Stephen J. Farr, Ph.D., President and CEO of Zogenix.

“We are fully committed to working with the FDA as quickly as possible to address the open issues and clarify the path to successfully re-filing our application.”

Zogenix’s Marketing Authorization Application, MAA, for FINTEPLA for the treatment of seizures associated with Dravet syndrome was previously accepted for review by the European Medicines Agency, EMA, and the Company anticipates an approvability decision could be reached by the EMA in the first quarter of 2020.

Piper Jaffray

Piper Jaffray analyst Danielle Brill lowered her price target on Zogenix to $68 after it received a refusal to file letter from FDA on its Fintepla new drug application.

The analyst notes that while the issues mentioned by the FDA sound like a simple fix, if the agency requires the company to conduct new toxicity studies, the re-submission could be delayed another 12-15 months.

In spite of the “discouraging news”, longer term, Brill still keeps her Overweight rating on Zogenix and believes that “the company should be able to leverage existing ICH data with fenfluramine” based on their reported prior FDA interactions, modeling a launch in Q2 of 2020.

ZGNX closed at $51.85, it last traded at $35.00.


To read timely stories similar to this, along with money making trade ideas, sign up for a membership to Stockwinners.

This article does not constitute investment advice. Each reader is encouraged to consult with his or her individual financial professional and any action a reader takes as a result of information presented here is his or her own responsibility.