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Completed

NCT Number: NCT04873232

A 6-Month Extension Study of VMDN-003-2 to Assess Engensis in Participants With Painful Diabetic Peripheral Neuropathy

To evaluate the durability of efficacy and long-term safety of intramuscular administration of Engensis or Placebo that was administered in the double-blind, randomized, VMDN-003-2 Placebo-controlled Phase 3 Study.

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Key information

Conditions

Diabetic Peripheral Neuropathy

Age range

18 year and older

Sex eligibility

All sexes

Study type

Interventional

Phase

Phase 3

Primary location

Arizona Research Center, Phoenix, Arizona, United States

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About this study

The purpose of this 6-month extension study (VMDN-003-2b) is to evaluate the durability of efficacy and long-term safety of intramuscular administration of Engensis or Placebo that was administered in the double-blind, randomized, VMDN-003-2 Placebo-controlled Phase 3 Study. No treatments will be administered in this VMDN-003-2b extension study. The combined overall duration of the VMDN-003-2 and VMDN-003-2b studies will be 12 months.

Participants will be enrolled in the VMDN-003-2b study at completion of the Day 180 Visit of Study VMDN-003-2. Participants will continue to be identified by the same Participant number and the same treatment group (Engensis or Placebo) assigned by randomization in Study VMDN-003-2. No study drug or treatment will be administered in this VMDN-003-2b extension study. The double-blind treatment assignment from the prior study will be maintained for Investigators and Participants during this extension study.

This extension study will assess the durability of efficacy and long-term safety of Engensis compared to Placebo as measured by changes in Average Daily Pain Score of the full Brief Pain Inventory for Diabetic Peripheral Neuropathy, Bedside sensory testing, physical examinations, laboratory assessments, vital signs, treatment-emergent adverse events, treatment-emergent serious adverse events, and adverse events of special interest.

Who can participate

Healthy volunteers accepted: No

Only the study team can determine whether someone qualifies for participation.

Inclusion criteria

  • Completed study VMDN-003-2 and consent to enroll in study VMDN-003-2b

Exclusion criteria

  • None

Treatment and study plan

Engensis

Biological

Injections with Engensis in study VMDN-003-2

Placebo

Other

Injections with Placebo in study VMDN-003-2

Primary outcomes

  1. To Evaluate the Efficacy of Intramuscular Administration of Engensis on Reducing Pain in Participants With Painful Diabetic Peripheral Neuropathy in the Feet and Lower Legs as Compared to Placebo

    Time frame: From the 7 days prior to the Day 0 Visit (Study VMDN-003-2, NCT04469270), Day 270, to the 7 days prior to the Day 365 Visit in the intent-to-treat population

    Change in the means of the Average Daily Pain Scores from the full Brief Pain Inventory for Diabetic Peripheral Neuropathy from the 7 days prior to the Day 0 Visit (Study VMDN-003-2) to the 7 days prior to the Day 365 Visit in the intent-to-treat population. The mean of the Average Daily Pain Scores are used for the primary endpoint recorded in the 7 days prior to the Days 270 and 365/ET Visits. The Brief Pain Inventory for Diabetic Peripheral Neuropathy scale is a 0 to 10 point scale with 10 being Pain as bad as you can imagine.

    The mean of at least 5 daily pain scores recorded for Question 5 of the Brief Pain Inventory for Diabetic Peripheral Neuropathy scale in electronic diary during the 7 days prior to the visits on Days 270 and 365/Early termination. The greater the negative difference between the followup visit and the Day 0 Baseline for each group for the average daily pain score in participants, would indicate that the average daily pain is declining.

Secondary outcomes

  1. To Evaluate the Efficacy of IM Administration of Engensis on the Worst Pain in Participants With Painful Diabetic Peripheral Neuropathy in the Feet and Lower Legs as Compared to Placebo

    Time frame: From the 7 days prior to the Day 0 Visit (Study VMDN-003-2) to the 7 days prior to the Day 365 Visit for Engensis compared to Placebo

    Change in the means of the Worst Pain Scores from the full Brief Pain Inventory for Diabetic Peripheral Neuropathy from the 7 days prior to Day 0 Visit (Study VMDN-003-2), to Day 270, and 7 days prior to the Day 365 Visit for Engensis compared to Placebo. The Brief Pain Inventory for Diabetic Peripheral Neuropathy scale is a 0 to 10 point scale with 10 being Pain as bad as you can imagine.

    The mean of at least 5 worst daily pain scores recorded for Question 3 of the Brief Pain Inventory for Diabetic Peripheral Neuropathy in the electronic diary during the 7 days prior to the Visits on Days 270 and 365/Early termination. The greater the negative difference between the followup visit and the Day 0 Baseline for each group for the worst pain score in participants, would indicate that the worst pain is declining.

  2. To Evaluate the Safety of IM Administration of Engensis in the Number of Participants With Painful DPN in the Feet and Lower Legs as Compared to Placebo

    Time frame: From Day 0 Visit (Study VMDN-003-2) to the Day 365 Visit

    Number of participants with adverse events and serious adverse events for Engensis compared to Placebo, including the number of participants with clinically significant laboratory values for Engensis compared to Placebo

  3. To Evaluate the Efficacy of Administration of Engensis on Reducing Pain in Participants With Painful Diabetic Peripheral Neuropathy in the Feet and Lower Legs

    Time frame: From the 7 days prior to the Day 0 Visit (Study VMDN-003-2), to the 7 days prior to the Day 270 Visit, and 7 days prior to the Day 365 Visit

    Proportion of Responders (≥ 50% reduction in the Average Daily Pain Scores from the full Brief Pain Inventory for Diabetic Peripheral Neuropathy) from the 7 days prior to the Day 0 Visit (Study VMDN-003-2) to the 7 days prior to the Day 270 Visit and the 7 days prior to the Day 365 Visit for Engensis compared to Placebo.

Sponsors and collaborators

Lead sponsor

Helixmith Co., Ltd.

Industry

Registry information

Official study title

A 6-Month Extension Study Following Protocol VMDN-003-2 - An Adaptive, Phase 3, Double-Blind, Randomized, Placebo-Controlled, Multicenter Study to Assess Engensis in Participants With Painful Diabetic Peripheral Neuropathy

Acronym: REGAiN-1B

Important dates

Study start
2021
Primary completion
2023
Study completion
2024
First posted
May 5, 2021
Registry last updated
Oct 9, 2025

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

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This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

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