Clinical trial NCT03795428: Long-Term, Open Label Extension Study of Pemziviptadil (PB1046) in PAH Subjects Following Completion of Study PB1046-PT-CL-0004
Official title: A Long-Term, Open Label Extension Study of Pemziviptadil (PB1046) Subcutaneous Injections in Pulmonary Arterial Hypertension Subjects Following Completion of Study PB1046-PT-CL-0004
Study type: INTERVENTIONAL
Overall status: TERMINATED
Phase: PHASE2
Conditions: Pulmonary Arterial Hypertension
Lead sponsor: PhaseBio Pharmaceuticals Inc.
Sponsor class: INDUSTRY
First posted: 2019-01-07
Enrollment: 25
Sex: ALL
Minimum age (years): 18
Maximum age (years): 79
Standard ages: ADULT
OLDER_ADULT
Accepts healthy volunteers: no
Allocation: NA
Intervention model: SEQUENTIAL
Intervention model description: To protect the blind of the parent study (PB1046-PT-CL-0004), all subjects entering PB1046-PT-CL-0006 will commence dosing at Week 1 on 0.4 mg/kg and will be up-titrated in 0.2 mg/kg increments in an open label fashion for 9 weeks.
Primary purpose: TREATMENT

Brief summary: This is a multi-center, Phase 2 Long-Term, Open Label Extension (OLE) Study to assess the safety and tolerability of pemziviptadil (PB1046) at an optimally titrated dose. This is a Long-Term, Open label Extension (OLE) Study for subjects with (PAH), having participated in double-blind Study PB1046-PT-CL-0004. The study will include adult subjects previously diagnosed with symptomatic PAH, who are receiving background clinician-directed therapy for PAH.

During this period, subjects will continue to be followed for safety and tolerability, as well as for periodic efficacy, quality of life data and immunogenicity. The study will continue per the schedule of events until such time when pemziviptadil (PB1046) is able to be self-administered, becomes commercially available to the subjects in a particular country or region, or the sponsor terminates the study due to lack of efficacy, safety or other reasons.

Detailed description: Subjects entering this study will enter from the double-blind Study PB1046-PT-CL-0004. The starting dose level of pemziviptadil (PB1046) for all subjects in this parent study was a sub-therapeutic or minimally effective dose (MED) of 0.2 mg/kg, administered by SC injection.

Subjects were randomized into the MED) Group or a dose-titration group. In the dose-titration group, individual subjects were titrated up to their maximum tolerated dose (MTD) in a blinded fashion, with the objective of titrating subjects up to a dose of at least 1.2 mg/kg or higher in the MTD Group, while subjects in the MED Group remained at the MED level of 0.2 mg/kg, and underwent "sham dose-titration" to maintain the blind.

Subjects entering the 0006 trial prior to implementation of this protocol amendment will remain blinded until such time that open label dosing will not unblind the 0004 study.

Eligibility criteria: Inclusion Criteria:

* Subjects must have completed Week 17 / End of Study of PB1046-PT-CL-0004;
* Willing and able to sign a written Informed Consent (IC) prior to all study-related procedures;
* Agrees to use a medically acceptable method of contraception (both male and female patients) throughout the entire study period and continuing for 30 days after their last dose of study drug. if the possibility of conception exists. Medically acceptable methods of contraception include the following: abstinence (not having sex), vasectomy (with confirmed negative sperm counts), condoms and partner using vaginal spermicide and/or cervical cap with spermicide or sponge; oral, implantable, or injectable contraceptives (starting ˃2 months before dosing), diaphragm with vaginal spermicide, intrauterine device, surgical sterilization (˃6 months after surgery). Female subjects ˂45 years of age of non-childbearing potential are defined as being surgically sterile by bilateral tubal ligation, bilateral oophorectomy, or hysterectomy. Female subjects 45to-60 years of age, inclusive, who are post-menopausal for at least 1 year, and have a follicle-stimulating hormone (FSH) level confirmation indicating post-menopausal status, will be considered to be of non-childbearing potential. Female subjects \> 60 years of age are considered post-menopausal and of non-childbearing potential;
* Willing and able to understand and follow instructions, return to the study unit for specified study visits; and, be able to participate in the study through the Stable Dose Maintenance Period, at a minimum.

Exclusion Criteria:

* Concomitant medical disorder, condition, or history, that in the opinion of the Investigator, would impair the subject's ability to participate in or complete the requirements of the study;
* Pregnant or lactating female subjects;
* Significant liver dysfunction as measured by any one of the following during participation in PB1046-PT-CL-0004. (If exclusionary laboratory results become available after the subject has enrolled in PB1046-PT-CL-0006 they should be discontinued. a. alanine aminotransferase (ALT) \> 3.0 times upper limit of normal (ULN) or; b. aspartate aminotransferase (AST) \> 3.0 times ULN or; c. serum bilirubin ≥ 1.6 mg/dL.
* Recent history of substance abuse that, in the opinion of the Investigator, would impair the subject's ability to participate in or complete the requirements of the study;
* In the opinion of the principal investigator (PI), any major surgical procedure within 90 days, or a planned surgical procedure during the study period; which would impact participation in PB1046-PT-CL-0006.
* Other new medical or psychiatric conditions which, in the opinion of the Investigator, would place the subject at increased risk, would preclude obtaining voluntary consent, or would confound the objectives of the study;
* Known hypersensitivity to study drug or any of the excipients of the drug formulation.

Primary outcomes:
measure: Incidence and Severity of Adverse Events
timeFrame: Duration of extension study - Starting the day of first dose and completing 28 days after last dose.
measure: Incidence of Clinical Laboratory Abnormalities
timeFrame: Duration of extension study - Starting the day of first dose and completing 28 days after last dose.
measure: Change in Diastolic Blood Pressure from baseline
timeFrame: Duration of extension study - Starting the day of first dose and completing 28 days after last dose.
measure: Change in Systolic Blood Pressure from baseline
timeFrame: Duration of extension study - Starting the day of first dose and completing 28 days after last dose.
measure: Change in Oral Body Temperature from baseline
timeFrame: Duration of extension study - Starting the day of first dose and completing 28 days after last dose.
measure: Change in Respiratory Rate from baseline
timeFrame: Duration of extension study - Starting the day of first dose and completing 28 days after last dose.
measure: Change in Heart Rate from baseline
timeFrame: Duration of extension study - Starting the day of first dose and completing 28 days after last dose.
measure: 12-Lead ECG - Incidence of clinically significant abnormal ECG findings as measured by 12 Lead ECG
timeFrame: Duration of extension study - Starting the day of first dose and completing 28 days after last dose.
measure: Incidence of Immunogenicity
timeFrame: Duration of extension study - Starting up to 30 days prior to first dose of study drug in original study (PB1046-PT-CL-0004/0005) and completing 28 days after last dose.
Secondary outcomes:
measure: Survival
timeFrame: Duration of extension study - Starting the day of first dose and completing 28 days after last dose.
measure: Change from baseline in 6MWD (6 minute walk distance test)
timeFrame: Duration of extension study - Starting the day of first dose and completing 28 days after last dose.
measure: Change from baseline in NT-proBNP
timeFrame: Duration of extension study - Starting the day of first dose and completing 28 days after last dose.
measure: Change from baseline in NYHA/WHO Functional Class (FC)
timeFrame: Duration of extension study - Starting the day of first dose and completing 28 days after last dose.
measure: Change from baseline in emPHasis-10 (Health Related Quality of Life) score
timeFrame: Duration of extension study - Starting the day of first dose and completing 28 days after last dose.
measure: Change from baseline in Borg Dyspnea Index (BDI)
timeFrame: Duration of extension study - Starting the day of first dose and completing 28 days after last dose.
measure: Incidence of Clinical Worsening
timeFrame: Duration of extension study - Starting the day of first dose and completing 28 days after last dose.
measure: Change in REVEAL Registry Risk Calculator Score
timeFrame: Duration of extension study - Starting the day of first dose and completing 28 days after last dose.
Other outcomes:
measure: Change in pulmonary artery pressure from baseline
timeFrame: Duration of extension study - Starting the day of first dose and completing 28 days after last dose.
measure: Change in cardiac index from baseline
timeFrame: Duration of extension study - Starting the day of first dose and completing 28 days after last dose.
measure: Change in total pulmonary resistance from baseline
timeFrame: Duration of extension study - Starting the day of first dose and completing 28 days after last dose.
Locations:
city: La Jolla
country: United States
facility: University of California San Diego
state: California
city: Sacramento
country: United States
facility: University of California - Davis
state: California
city: Miami
country: United States
facility: University of Miami - Pulmonary Research Center
state: Florida
city: Atlanta
country: United States
facility: Emory University, The Emory Clinic
state: Georgia
city: Iowa City
country: United States
facility: University of Iowa Hospitals and Clinics
state: Iowa
city: Kansas City
country: United States
facility: University of Kansas Medical Center
state: Kansas
city: Boston
country: United States
facility: Tufts Medical Center
state: Massachusetts
city: Boston
country: United States
facility: Brigham and Women's Hospital
state: Massachusetts
city: New York
country: United States
facility: NYU Langone Health
state: New York
city: Rochester
country: United States
facility: University of Rochester Medical Center
state: New York
city: Cincinnati
country: United States
facility: The Lindner Center for Research and Education at The Christ Hospital
state: Ohio
city: Cincinnati
country: United States
facility: University of Cincinnati
state: Ohio
city: Oklahoma City
country: United States
facility: INTEGRIS Baptist Medical Center
state: Oklahoma
city: Pittsburgh
country: United States
facility: Allegheny General Hospital
state: Pennsylvania
city: Pittsburgh
country: United States
facility: UPMC Presbyterian
state: Pennsylvania
city: Dallas
country: United States
facility: University of Texas Southwestern Medical Center
state: Texas
Study officials:
References: