TerminatedPhase 1ACTRN12624000898550

A Study to Investigate the Safety of SEP-786 101 Capsules Compared With Placebo Capsules in Healthy Volunteer Participants Aged 24 Through 55 Years

A Phase 1, Double Blind, Randomized, Placebo Controlled, Single and Multiple Ascending Dose Study to Evaluate the Safety, Tolerability, Pharmacokinetics, and Pharmacodynamics of Oral Doses of SEP-786 in Healthy Adult Participants (SEP-786 Phase 1 SAD and MAD)


Sponsor

Septerna, Inc.

Enrollment

180 participants

Start Date

Aug 30, 2024

Study Type

Interventional

Conditions

Summary

The main aim of the study is to evaluate the safety, PK, and PD effects of SEP 786 in healthy participants. The results of this study will help inform the dosing and frequency of dosing in participants with hypoparathyroidism, which is the anticipated main therapeutic use for SEP-786.


Eligibility

Sex: Both males and femalesMin Age: 24 YearssMax Age: 55 Yearss

Inclusion Criteria10

  • Are 24 through 55 years of age, inclusive, at the time of signing the informed consent
  • Are overtly healthy, as determined by medical evaluation, including medical history, physical examinations, laboratory profiles, vital signs, and 12 lead ECGs
  • Have clinical laboratory test values within the normal range, unless assessed by the investigator or designee as a clinically nonsignificant value, with repeat laboratory tests permitted if necessary to make decisions
  • Have a body weight within the range of greater than or equal to (>=) 50 kilogram (kg) and less than or equal to (<=) 90 kg and body mass index (BMI) within the range of >=18.5 to <=27.0 kilogram per square meter (kg/m^2)
  • Have an estimated glomerular filtration rate (eGFR) >=90 milliliter per minute (mL/min)
  • Note: eGFR is estimated by the chronic kidney disease epidemiology collaboration (CKD EPI) equation
  • Have a QT interval corrected by Fridericia’s method (QTcF) <=450 millisecond (ms) for assigned male at birth (AMAB) participants and <=470 ms for assigned female at birth (AFAB) participants at screening
  • Have inorganic phosphorus and/or serum calcium (albumin corrected) within normal limits at screening and Day -2, unless assessed by the investigator as a clinically insignificant value
  • Are willing and able to abstain from drug, alcohol, and tobacco from Day -2 until discharge from the clinical research unit (CRU)
  • Have negative urine drug and breath alcohol results at screening and Day -2

Exclusion Criteria34

  • Have a history or presence of any of the following:
  • a. Malignant disease, other than basal cell epithelioma/carcinoma or completely resected squamous skin cancer with no recurrence for 12 months
  • b. Diabetes mellitus
  • Note: a history of gestational diabetes that is fully resolved is permitted.
  • c. Hyperparathyroidism, hypoparathyroidism, hypercalcemia, hypercalciuria, kidney stones, familial benign hypocalciuric hypercalcemia, osteomalacia, Paget’s disease, osteoporosis, or any type of metabolic bone disease or radiation therapy to the skeleton
  • d. Cardiac dysfunction, including abnormal echocardiogram left ventricular ejection fraction (LVEF) <50%, congestive heart failure, long QT syndrome, valvular heart disease except clinically insignificant mitral valve prolapse, hypertrophic cardiomyopathy, or cardiovascular disease
  • e. Cerebrovascular disease
  • f. Thromboembolic events or ischemic heart disease
  • g. Alcoholism or drug abuse within the past 1 year
  • Note: Alcohol abuse is considered >14 standard drinks/week in AFAB potential participants and >21 standard drinks/week in AMAB potential participants.
  • h. Stomach or intestinal surgery or resection that would potentially alter absorption and/or excretion of orally administered drugs
  • i. Clinically significant medical or psychiatric condition or disease in the opinion of the principal investigator or designee
  • j. Hepatitis B (defined as HBsAg reactive) or hepatitis C (defined as HCV antibody–positive) at screening
  • k. Human immunodeficiency virus (HIV) positive status (participants to be screened for HIV or provide a recent negative test)
  • Have an acute disease state (eg, nausea, vomiting, fever, diarrhea) within 7 days of the first dose of study intervention
  • Have a positive COVID 19 polymerase chain reaction (PCR) test at admission
  • Are unable to refrain from using or anticipate the use of any drug or medical device, including prescription and over the counter (OTC) medications, nutritional or dietary supplements, recreational drugs, herbal preparations, or vitamins, from Day -7 until follow up visit, or as specified below:
  • a. From Day -28 for significant inhibitors or inducers of CYP enzymes and/or P gp, including St. John’s wort, to discharge from CRU
  • b. From Day -42 for PPIs, supplements containing calcium (Ca) or magnesium (Mg) (including Tums®), and H2 antagonists until discharge from CRU
  • Exceptions:
  • a. Acetaminophen, which may be used at doses of 1 gram or less per day until 24 hours prior to check in
  • b. OTC nonsteroidal anti inflammatory drug (NSAIDs), which may be used until 24 hours prior to check in
  • c. OCPs or an intrauterine device (IUD) or intrauterine hormone releasing system (IUS)
  • d. Any drug approved by the medical monitor
  • Have participated in another clinical study within 28 days prior to the first dose of study drug or at least 5.5 half lives, based on the t1/2 for the investigational drug, whichever is longer. The 28 day window is derived from date of the previous study’s last scheduled blood collection or dosing, whichever was later, to Day 1 of the current study.
  • Have clinically significant abnormalities on clinical laboratory results (including hematology, chemistry, and urinalysis) at screening and Day -2
  • Have evidence of endocrine alterations of calcium/phosphate/PTH homeostasis at screening
  • Have donated blood within 7 days of the first dose of study intervention or have had significant (ie, >=500 mL) blood loss within 8 weeks of the first dose of study intervention
  • Have used tobacco within 60 days of screening at a rate of >5 units (cigarettes or vaping equivalents)/week
  • Have consumed alcohol within 24 hours of check in
  • Have a known hypersensitivity to the components of the study intervention
  • Are likely to be noncompliant with respect to study conduct
  • Are mentally or legally incapacitated or have significant emotional problems at the time of the screening visit or expect to have any during the conduct of the study
  • Have any other reason that, in the opinion of the investigator or designee, would prevent the participant from completing participation or following the study schedule

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Interventions

This study will be conducted in to 3 parts. Part 1 will evaluate single ascending doses (SAD) of SEP-786 administered orally as capsule on Day 1 in healthy participants. It will consist of a maximum o

This study will be conducted in to 3 parts. Part 1 will evaluate single ascending doses (SAD) of SEP-786 administered orally as capsule on Day 1 in healthy participants. It will consist of a maximum of 8 cohorts and each cohort will consist of up to 10 healthy participants. Participants will be randomized to SEP-786 or placebo (up to 80 participants total) in 1 of the 8 treatment cohorts. The dose range for SEP-786 will be between 5 mg and 200 mg. Part 2 will evaluate once-daily multiple ascending doses (MAD) of SEP-786 from Day 1 through 5. It will consist of a maximum of 4 cohorts and each cohort will consist of up to 10 healthy participants. Participants will be randomized to SEP-786 or placebo (up to 40 participants total) in 1 of the 4 treatment cohorts. The dose range for SEP-786 will be between 20 and 80 mg. Part 3 will evaluate twice-daily MAD of SEP-786 from Day 1 through 5. It will consist of a maximum of 3 cohorts and each cohort will consist of up to 10 healthy participants. Participants will be randomized to SEP-786 or placebo (up to 30 participants total) in 1 of the 3 treatment cohorts. The dose range for SEP-786 will be between 10 and 30 mg. Sentinel dosing will be used in the Part 1 treatment cohorts (SAD) to evaluate acute post-dosing effects in each arm. Before initiating a new dosing arm, Safety Review Committee will review all available safety, tolerability, and pharmacodynamic (PD), data collected in the previous treatment cohorts. For SAD arms, the data will be assessed through at least Day 4, and for MAD arms, up to at least Day 8. Participants will be closely monitored in the clinical research unit (CRU) for safety monitoring. The study will be conducted at one site in Australia with safety, serum chemistry, pharmacokinetic, and pharmacodynamics parameters monitored for each participant. The anticipated total duration of the study is approximately 9 months.


Locations(1)

VIC, Australia

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ACTRN12624000898550


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