Long-term Follow-up Study to Evaluate Durability of Treatment Response in Previous Bepirovirsen Study Participants (B-Sure)

Conditions

• Hepatitis B

Eligibility Criteria

Sex

ALL

Age

18 Years - N/A

Healthy Volunteers

Not accepted

Interventions

• Bepirovirsen — DRUG
  No study drug will be administered in this study. Eligible participants who received prior treatment with bepirovirsen in the parent studies will be included.
• Placebo — DRUG
  No study drug will be administered in this study. Eligible participants who received prior treatment with placebo in the parent studies (209668, 202009, and 219288) will be included to maintain the blind in the still ongoing parent studies.

Study Details

This is a global multi-center, long-term follow-up study to assess durability of efficacy, as measured by maintenance of treatment response from the parent study, in participants who participated in a previous bepirovirsen study and achieved a complete or partial response. Eligible participants will be enrolled in this study after completing the end of study (EoS) visit in the respective parent bepirovirsen studies (studies B-Clear \[209668: NCT04449029\], B-Together \[209348: NCT04676724\], B-Fine \[212602: NCT04544956\], B-Well 1 \[202009: NCT05630807\], B-Well 2 \[219288: NCT05630820\], and TH HBV ASO-001 \[217023: NCT05276297\]). Participants will be categorized as Not-on-NA, NA-cessated, or On-NA based on their nucleos(t)ide analogue (NA) status in the parent study. No further treatment with bepirovirsen will be administered in this study.

Key Dates

First listed

Jul 8, 2021

Start date

Dec 14, 2021

Status verified

Jun 2026

Primary completion

Jan 24, 2029

Completion

Jan 24, 2029

Study Design

Enrollment

360 participants (estimated)

Allocation

NON_RANDOMIZED

Intervention model

PARALLEL

Primary purpose

TREATMENT

Arms

• Experimental: Not-on-NA participants
  Participants rolling over from study 209668 who have not received nucleos(t)ide analogue (NA) therapy during the parent study and remain off NAs will be included in this arm. Participants will be followed up for 33 months. Participants maintaining either functional cure (FC) or a partial response off NA treatment at Month 33 will be eligible to be followed up for an additional 2 years. No study treatment will be administered in this study.
• Experimental: On-NA participants
  Participants rolling over from studies 209668, 209348, 212602, 202009, 219288, and 217023 who entered the parent study on stable NA therapy and remained on NA therapy for the duration of the treatment and follow-up periods in the parent study will be included in this arm. NA cessation will occur at 3 months in 206882 for eligible and willing participants. Participants will be followed up for 33 months. Participants rolling over from studies 209668 and 209348 who stopped NA treatment and are maintaining either FC or a partial response at Month 33, and remaining off NA treatment, will be eligible to be followed up for an additional 2 years. No study treatment will be administered in this study.
• Experimental: NA-cessated participants
  Participants rolling over from studies 202009 and 219288 who have stopped NA treatment during the parent study will be included in this arm. Participants will be followed up for 33 months. No study treatment will be administered in this study.

Primary Outcome Measure

Percentage of Not-on-NA participants without loss of parent study primary outcome (PSPO) [ Time Frame: From primary endpoint assessment in the parent study up to Month 57 ]

Locations (5)

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