Study of Oral TLR8 Agonist Selgantolimod on HBsAg in Participants With Both Chronic Hepatitis B and HIV

Inclusion Criteria:

1. HIV-1 infection

2. Effective antiviral therapy for HIV (ART) and HBV that includes TDF, TAF, TDF/FTC,TDF/3TC (tenofovir disoproxil fumarate plus lamivudine), TAF/FTC, or entecavir (ETV), for ≥5 years immediately prior to study entry. ART is defined as including aminimum of two anti-HIV antivirals.

3. CD4+ cell count ≥350 cells/mm3

4. HIV-1 RNA <50 copies/mL measured on at least two occasions at least 12 weeks apart,with no documented value >200 copies/mL, over the 12 months prior to study entry.

5. Positive or negative HBeAg

6. Negative anti-HDV

7. Current CHB infection

8. HBV DNA level <50 IU/mL measured on at least two occasions at least 12 weeks apart,with no documented value ≥50 IU/mL, over the 12 months prior to study entry.

9. Quantitative HBsAg >1000 IU/mL

10. Hepatitis C virus (HCV) antibody negative, or if the participant is HCV antibodypositive, an undetectable HCV RNA.

11. Participants age ≥18 years and ≤70 years at study entry

12. Participants must agree to stay on an effective antiviral therapy for HIV (ART) andHBV throughout the study.

Exclusion Criteria:

1. Receipt of treatment for HCV within 24 weeks prior to study entry

2. Evidence of advanced fibrosis or cirrhosis (Metavir ≥F3 or equivalent).

3. Current or prior history of clinical hepatic decompensation (e.g., ascites,encephalopathy, or variceal hemorrhage)

4. History of HCC or cholangiocarcinoma

5. Malignancy within 5 years prior to study entry. NOTE: A history of non-melanoma skincancer (e.g., basal cell carcinoma or squamous cell skin cancer) is notexclusionary.

6. History of solid organ transplantation

7. Presence of any active or acute AIDS-defining opportunistic infections within 60days prior to study entry

8. History of uveitis or posterior synechiae

9. Breastfeeding