| Eligibility |
Inclusion Criteria:
- 1. Provide written informed consent before any study assessment is performed. 2. Male
or nonpregnant, nonlactating female between the ages of 18 and 65 years (inclusive) at
screening.
Females of childbearing potential (as defined in Appendix 3) must have a negative serum
pregnancy test at screening and a negative urine pregnancy test at baseline prior to
enrollment. and agree to use 2 methods of birth control. Methods must include Protocol
CONFIDENTIAL Labcorp Drug Development Study: 000000244098 Protocol Reference: CB06-036-102
Protocol Version 1.0, 24 January 2023 Page 7 of 68 1 highly effective method with a
secondary method of birth control during the study and for 3 months following the last dose
of CB06-036. These methods are defined in Appendix 3.
Note: Females must agree not to breastfeed during the study and 30 days after receiving the
last administration of CB06-036 and not to donate eggs (ova, oocytes) for assisted
reproduction during the study and 90 days after receiving the last administration of
CB06-036. Females of nonchildbearing potential defined as permanently sterile (ie, due to
hysterectomy, bilateral salpingectomy, or bilateral oophorectomy) or postmenopausal, as
defined in Appendix 3.
Males with a female partner(s) of childbearing potential will agree to use contraception as
detailed in Appendix 3. Male subjects must not donate sperm during the study and for at
least 90 days after the last administration of CB06-036.
3. Documented evidence of chronic HBV infection (eg, HBsAg positive for more than 6 months)
with detectable HBsAg level at screening. Cohort 4 only: qHBsAg should be <3000 IU/mL.
4. Have been on commercially available HBV NA treatment(s) (tenofovir alafenamide,
tenofovir disoproxil fumarate, entecavir, either as a single agent or in combination) for
at least 6 months with no change in regimen for 3 months prior to screening.
5. HBV DNA <90 IU/mL; measured at least once by local laboratory assessment within 6 months
prior to screening.
6. HBV DNA <90 IU/mL at screening. 7. HBeAg Status (Cohorts 1 to 3): HBeAg-positive or
negative, Cohort 4 only: HBeAg-negative.
8. Body mass index (BMI) of 18.0 to 32.0 kg/m2 (inclusive), and a total body weight =50.0
kg for males and =45.0 kg for females at screening.
9. Electrocardiogram (ECG) without clinically significant abnormalities and with QT
interval corrected using Fridericia's formula (QTcF) =450 msec for males and =470 msec for
females at screening.
10. Willing and able to comply with scheduled visits, treatment plan, laboratory tests, and
other study procedures as specified in the protocol.
Exclusion Criteria:
- 1. CHB patients with extensive bridging fibrosis or cirrhosis (METAVIR =3 or Ishak =4
by a liver biopsy within 5 years, FibroTest score >0.48 and APRI >1, or a historic
FibroScan >9 kPa within 6 months prior to screening).
2. Subjects met any of the following laboratory parameters at screening:
1. hemoglobin <12 g/dL (for males) or <11 g/dL (for females)
2. white blood cell count <2500 cells/mm3 Protocol CONFIDENTIAL Labcorp Drug
Development Study: 000000244098 Protocol Reference: CB06-036-102 Protocol Version
1.0, 24 January 2023 Page 8 of 68
3. neutrophil count <1500 cells/mm3 (or <1000 cells/mm3 if considered a
physiological variant in a subject of African descent)
4. ALT >2 × ULN
5. INR >ULN unless the subject is stable on an anticoagulant regimen affecting INR
6. albumin <3.5 g/dL
7. direct bilirubin >1.5 × ULN
8. platelet Count <100,000/µL
9. estimated creatinine clearance (CrCl) <60 mL/min (using the Cockcroft-Gault
method).
3. Active systemic infections (other than common cold) within 2 weeks before
randomization.
4. At screening, known history of lymphoma, leukemia, or malignancy within the
past 5 years, except for squamous epithelial carcinomas of the skin that have
been resected with no evidence of metastatic disease for 3 years.
5. History or presence of a medical condition associated with liver disease other
than HBV infection (eg, hemochromatosis, autoimmune hepatitis, alcoholic liver
disease, toxin exposure, thalassemia, nonalcoholic steatohepatitis). Other known
hepatic or biliary abnormalities (with the exception of Gilbert's syndrome or
asymptomatic gallstones).
6. Personal or family history or symptomatology indicative of a risk of
immune-mediated disease (eg, inflammatory bowel disease, idiopathic
thrombocytopenic purpura, lupus erythematosus, autoimmune hemolytic anemia,
scleroderma, severe psoriasis, rheumatoid arthritis, autoimmune uveitis, multiple
sclerosis).
7. Received solid organ or bone marrow transplant. 8. Received prolonged systemic
therapy with immunomodulators (eg, corticosteroids) or biologics (eg, monoclonal
antibody, interferon) within 3 months of screening.
9. Blood donation of approximately 500 mL within 56 days prior to first
administration of study drug, plasma from 2 weeks prior to screening, or
platelets from 6 weeks prior to screening.
10. Have a known history of asthma. Note: Subjects with resolved childhood asthma
with no history of hospitalization due to asthma are allowed.
11. Are currently enrolled in, or discontinued from, a clinical trial involving
an investigational product or non-approved drug within the last 4 weeks or at
least 5 half-lives of the last dosing; or concurrently enrolled in any other
types of medical research judged not to be scientifically or medically compatible
with this study.
12. Have had a live vaccination within 12 weeks before randomization, or intend
to have a live vaccination during the course of the study, or have participated
in a vaccine clinical trial within 12 weeks prior to randomization. Investigators
should review the vaccination status of the subjects and follow the local
guidelines for adult vaccination Protocol CONFIDENTIAL Labcorp Drug Development
Study: 000000244098 Protocol Reference: CB06-036-102 Protocol Version 1.0, 24
January 2023 Page 9 of 68 with non-live vaccines intended to prevent infectious
disease prior to first administration of study drug.
13. Co-infection with human immunodeficiency virus (HIV), hepatitis C virus (HCV)
or hepatitis D virus (HDV).
• Subjects who are HCV Ab positive, but have a documented negative HCV RNA, are
eligible.
14. Abnormal clinical laboratory values at screening that, in the opinion of the
investigator, pose an unacceptable risk to the subject or of interfering with the
interpretation of study results if participating in the study.
15. Pregnant or nursing (lactating) women, where pregnancy is defined as the
state of a female after conception and until the termination of gestation,
confirmed by a positive human chorionic gonadotropin laboratory test at screening
or at Days -7 to -4.
16. Have any other condition that precludes the subject from following and
completing the protocol in the opinion of the investigator.
17. Significant history or clinical manifestation of any metabolic, allergic,
dermatological, hepatic, renal, hematological, pulmonary, cardiovascular,
gastrointestinal, neurological, respiratory, endocrine, retinal, or psychiatric
disorder, as determined by the investigator (or designee).
18. History of stomach or intestinal surgery or resection that would potentially
alter absorption and/or excretion of orally administered drugs (uncomplicated
appendectomy and hernia repair will be allowed).
19. Use or intend to use any nonprescription medications or products including
vitamins, minerals, and herbal supplements (ie, traditional Chinese medicine),
protein powders or fish oils preparations within 7 days prior to screening,
considered to potentially impact subject safety or the objectives of the study,
as determined by the investigator (or designee).
20. Alcohol consumption of >21 units per week for males and >14 units for
females. One unit of alcohol equals 12 oz (360 mL) beer, 1½ oz (45 mL) liquor, or
5 oz (150 mL) wine.
21. Ingestion of Seville orange-, or grapefruit-containing foods or beverages
within 7 days prior to screening.
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