A Phase I/II Study of KB103, a Topical HSV1-COL7, on DEB Patients

Phase 1

Completed

• Conditions: Dystrophic Epidermolysis Bullosa
• Interventions: Biological: Topical beremagene geperpavec; Biological: Placebo gel

• Registration Number: NCT03536143
• Lead Sponsor: Krystal Biotech, Inc.

Brief Summary

This study was conducted to assess the safety and efficacy of topical Beremagene Geperpavec (KB103, HSV1-COL7) on DEB patients.

Detailed Description

The primary objectives were the evaluation of safety, through incidence of adverse events associated with the administration of B-VEC as compared to placebo, as well as the demonstration of molecular correction of the disease by establishing the presence of functional COL7 expression and anchoring fibrils (AF) formation post administration of B-VEC. Additional primary objectives were to assess the proportion of wounds with complete wound closure (≥90% reduction from baseline wound surface area) at Week 8, 10, and 12, the duration of wound closure, and the time to wound closure of B-VEC treated wounds as compared with placebo treated wounds.

Study Timeline

• Study First Submitted: 2018-04-20
• Study Start: 2018-05-06
• Study First Submitted QC: 2018-05-14
• Study First Posted: 2018-05-24
• Primary Completion: 2019-11-01
• Study Completion: 2019-11-01
• Results First Submitted: 2022-08-18
• Status Verified: 2022-11
• Results First Submitted QC: 2023-01-30
• Last Update Submitted: 2023-01-30
• Results First Posted: 2023-01-31
• Last Update Posted: 2023-01-31

Recruitment & Eligibility

• Status: COMPLETED
• Sex: All
• Target Recruitment: 12

Inclusion Criteria

• Clinical diagnosis of the recessive form of dystrophic epidermolysis bullosa (RDEB).

• Age

  1. Phase 1: 18 years old or older,
  2. Phase 2a: 5 years old or older,
  3. Phase 2b: 2 years old or older,
  4. Phase 2c: 2 years old or older.

• Willing and able to give consent/assent

• Confirmation of RDEB diagnosis by genetic testing, IF, and IEM

• LH24 antibody negative (non-collagenous [NC] 2domain [NC2-]) and NC1 domain [NC1+]). (This criterion is applicable to the first 2 adults on the study (Phase 1). Subsequent subjects can be NC1+ or NC1-)

• Confirmed RDEB COL7A1 mutations in subject

• Wound that meets the wound size/surface area entry criteria:

  1. Phase 1: Two wounds up to 10 cm2; 1 randomized to B-VEC and 1 randomized to placebo
  2. Phase 2a and 2b: At least 3 wounds up to 20 cm2; 2 wounds randomized to B-VEC and 1 randomized to placebo
  3. Phase 2c: At least 2 wounds up to 50 cm2; at least 1 randomized to B-VEC and 1 randomized to placebo

• Subjects, who are, in the opinion of the investigator, able to understand the study, cooperate with the study procedures, and are willing to return to the clinic for all the required follow-up visits.

Read More

Exclusion Criteria

• Medical instability limiting ability to travel to the investigative center
• The presence of medical illness expected to complicate participation and/or compromise the safety of this technique, such as active infection with human immunodeficiency virus (HIV), hepatitis B (as determined by hepatitis B surface antigen screening), or hepatitis C (as determined by detection of hepatitis C antibodies, or positive result of hepatitis C polymerase chain reaction [PCR] analysis)
• Serum antibodies to COL7 demonstrated on enzyme-linked immunosorbent assay (ELISA), indirect immunofluorescence microscopy, Western blot, or cell-mediated immunity to enzyme-lined ImmunoSpot® (subjects with negative results within 12 months of screening are eligible)
• Active infection in the area that will undergo administration
• Evidence of systemic infection
• Known allergy to any of the constituents of the product
• Current evidence or a history of squamous cell carcinoma in the area that will undergo treatment
• Active drug or alcohol addiction
• Hypersensitivity to local anesthesia (lidocaine/prilocaine cream)
• Receipt of chemical or biological study product for the specific treatment of RDEB in the past 3 months
• Specific wounds that have previously been administered investigational gene or cell therapy
• Subjects who have taken systemic antibiotics within 7 days
• Positive pregnancy test or breast-feeding
• Clinically significant abnormalities as determined by the investigator

Read More

Study & Design

• Study Type: INTERVENTIONAL
• Study Design: PARALLEL

Arm && Interventions

Group	Intervention	Description
Topical beremagene geperpavec	Topical beremagene geperpavec	HSV1-COL7A1 vector (KB103)
Placebo	Placebo gel	Placebo

Primary Outcome Measures

Name	Time	Method
Number of Subjects Reported at Least One Adverse Event, Safety Population	baseline to 12 weeks	Safety assessments included evaluation of medical and medication history, physical / skin examination, vital signs, adverse events, and laboratory evaluations. Due to the 'split-person' intrasubject design, the safety assessments were reported at subject level, but not per intervention.
Complete Wound Closure Responder, ITT Population	from baseline at Weeks 8, 10, and 12	One wound is a responder if the reduction from baseline in wound surface is ≥90%.
Number of Adverse Events Reported, Safety Population	baseline to 12 weeks	Safety assessments included evaluation of medical and medication history, physical / skin examination, vital signs, adverse events, and laboratory evaluations. Due to the 'split-person' intrasubject design, the safety assessments were reported at subject level, but not per intervention.
Time to Wound Closure Analysis, ITT Population	baseline to complete wound closure	Time to wound closure was defined as the time from the first treatment to Complete Wound Closure (≥90% reduction in wound surface area from baseline)
Duration of Wound Closure, ITT Population	Time from the complete closure to the first reopening of the same wound	Duration of wound closure

Trial Locations

Locations (1)

Stanford University; 🇺🇸 Stanford, California, United States