Study of DA-9801 to Treat Diabetic Neuropathy

Phase 2

Completed

Conditions: Diabetic Neuropathy

Interventions: Drug: DA-9801 600mg
Drug: Placebo
Drug: DA-9801 900mg
Drug: DA-9801 300mg

Registration Number: NCT01822925

Lead Sponsor: NeuroBo Pharmaceuticals Inc.

Brief Summary: To evaluate the effectiveness of DA-9801 at 300mg, 600mg, 900mg and placebo, in reducing pain in subjects with diabetic neuropathic pain compared to their baseline values.

Detailed Description: This is a double-blind, randomized, parallel group, dose ranging, placebo-controlled study where eligible subjects (age 18 to 75 years) will have an average pain score ≥ 4 on an 11-point Likert numerical rating scale (NRS) for at least four days each week prior to randomization as assessed by daily pain diaries. Eligible subjects will be randomized to a 1:1:1:1 ratio to receive 300mg, 600mg, 900mg of DA-9801, or placebo three times a day for 12 weeks. During and at the end of the 12-week treatment period subjects will be evaluated for safety and efficacy parameters. A follow-up visit for safety will occur two weeks after the last treatment visit (TV).

The Screening Phase (2 weeks) is designed to determine whether subjects are eligible to proceed to the Treatment Phase of the study and consists of a series of screening assessments designed to determine eligibility. Eligible subjects will undergo a two-week washout period for medications and therapies administered for pain management.

At or up to 21 days before the Screening Visit, written informed consent from (ICF) the subject will be obtained by the Investigator or a suitably qualified designee before the performance of any protocol specific procedure. At the Screening Visit, the subject will be issued a daily diary in order to record daily pain level during the screening phase.

The Treatment Phase (TV0 to TV12) begins with a series of assessments designed to confirm the subjects' continued eligibility. The site will collect the daily diary and the subject's pain score will be determined. Only subjects whose average pain score is ≥ 4 for at least four days each week will be randomized to any of the four treatment groups.

DA-9801 administration schedule is three times per day, starting from TV0 to TV12.

During this study phase subjects will be evaluated on a weekly basis. Efficacy evaluations each week will include the subject's global impression of improvement and CGI of pain. Safety evaluations during the Treatment Phase will consist of adverse event assessments at each visit.

The Follow-up Visit (two weeks after last TV) The Follow-up Visit is designed to assess safety and will occur 14 days after the last TV. If the subject is withdrawn from the study prior to TV12, the subject should be exited from the study AFTER completing the specified assessments for that visit.

Recruitment & Eligibility

Status: COMPLETED

Sex: All

Target Recruitment: 128

Inclusion Criteria

Must be 18 to 75 years of age
Diagnosed with Type I or Type II diabetes
HbA1c ≤ 12% at the time of screening
Has diabetic neuropathic pain (numbness, soreness, shooting or poking pain) in the lower extremities for more than 3 months prior to screening and with no adequate relief from other treatments
Has an average pain score of ≥ 4 for 24 hours at least 4 days out of the week prior to randomization as assessed by the 11-point Likert NRS.
If female of childbearing potential, subject must have a negative serum pregnancy test at screening
Understands and is willing to participate in the clinical study and can comply with study procedures and visits.
Normal cognitive and communicative ability as judged by clinical assessment and ability to complete self-reported questionnaires
Subject is willing and able to give informed consent

Exclusion Criteria

Evidence of another type of neuropathic pain caused by a condition other than diabetes
Pain from another source as severe or greater than the pain under study
BMI (Body Mass Index) > 37 kg/m2
Clinical signs of infection related to sores of any type on the legs
Subjects on any investigational drug(s) or therapeutic device(s) within 30 days preceding screening; or subject or physician anticipates use of any of these therapies by the subject during the course of the study
Previous participation in the Treatment Phase of this Protocol
History of drug or alcohol abuse, within the past 6 months
Malignant disease not in remission for 5 years or more that has been medically or surgically treated without evidence of metastases
Presence of one or more medical conditions, as determined by medical history, which seriously compromises the subject's ability to complete the study, including history of poor adherence with medical treatment, renal, hepatic, hematologic, active auto-immune or immune diseases that, in the opinion of the Investigator, would make the subject an inappropriate candidate for this study: c) One or more abnormal blood biochemistry analyte result that is ≥ 3 times that of the upper limit of the normal range; d) For laboratory results that are significantly lower than the normal range, specific criteria will be used to judge subject eligibility for randomization for Total protein, Albumin, and Hemoglobin or Platelets.
Known history of having Acquired Immunodeficiency Syndrome (AIDS) or with a history known to be infected with Human Immunodeficiency Virus (HIV)
New York Heart Association (NYHA) Class III and IV congestive heart failure (CHF), as defined by the following criteria: a)Class III: Symptoms with moderate exertion b)Class IV: Symptoms at rest
Pregnant or breast feeding
Women of child-bearing potential not using an effective birth control method. Women of child-bearing potential are defined as women physiologically capable of becoming pregnant, UNLESS they meet the following criteria:

d) Post-menopausal: 12 months of natural (spontaneous) amenorrhea or 6 months of spontaneous amenorrhea with serum Follicle Stimulating Hormone (FSH) levels > 40mIU/m, OR; e) 6 weeks post surgical bilateral oophorectomy with or without hysterectomy, OR; f) Are using one or more of the following acceptable methods of contraception: surgical sterilization, hormonal contraception, and double-barrier methods. Reliable contraception should be maintained throughout the study and for 7 days after study discontinuation.
Subjects with a diagnosis of psychiatric disorders such as major depressive disorder, bipolar disorder, obsessive compulsive disorder, generalized anxiety, dysthymia or suicidality/suicide ideation
Administration of local anesthetic shot or systemic steroids within two months of screening
Subjects not willing to undergo a two-week washout period for pharmacologic and non-pharmacologic pain management techniques

Study & Design

Study Type: INTERVENTIONAL

Study Design: PARALLEL

Arm && Interventions

Group	Intervention	Description
DA-9801 600mg	DA-9801 600mg	DA-9801 will be administered in tablet form, 200 mg taken 3 times daily to subjects randomized to this arm of the study. Subjects will be expected to take this medication for 12 weeks.
Placebo	Placebo	Placebo (same formulation as DA-9801 but without the active ingredients) will be administered in tablet form, 3 times daily to subjects randomized to this arm of the study. Subjects will be expected to take this tablet for 12 weeks.
DA-9801 900mg	DA-9801 900mg	DA-9801 will be administered in tablet form, 300 mg taken 3 times daily to subjects randomized to this arm of the study. Subjects will be expected to take this medication for 12 weeks.
DA-9801 300mg	DA-9801 300mg	DA-9801 will be administered in tablet form, 100mg taken 3 times daily to subjects randomized to this arm of the study. Subjects will be expected to take this medication for 12 weeks.

Primary Outcome Measures

Name	Time	Method
Change in Clinic Visit Pain Score at the 12 Week Visit Compared to Baseline as Assessed by the 11-point Likert Numerical Rating Scale (NRS)	Baseline to 12 weeks of treatment	Pain score was assessed by the subject using the 11-point Likert rating scale for pain (0=no pain to 10=worst possible pain) prior to conduct of any other study assessment. The change in clinic visit pain score at the 12-week visit was compared to baseline.

Secondary Outcome Measures

Name	Time	Method
Percentage Change in Clinic Visit Pain Score at the 12-week Visit Compared to Baseline as Assessed by the 11-point Likert Numerical Rating Scale (NRS)	Baseline and over 12 week treatment period	Pain intensity was assessed by the subject before any other protocol procedures at baseline and at the 12- week visit using an 11-point Likert-type numerical rating scale for pain (0=no pain, to 10=worst possible pain) (Negative values indicate percentage reductions).
Number of Participants With at Least 30% Improvement Compared to Baseline as Assessed by the 11- Point Likert Numerical Rating Scale (NRS) at the Week 12 Clinic Visit	Baseline to 12 week treatment period	Pain intensity was assessed by the subject before any other protocol procedures at baseline and week 12 based on 11-point Likert-type numerical rating scale for pain (0=no pain, to 10=worst possible pain). The number of participants who had achieved ≥ a 30% reduction in pain from the baseline was to be compared between the treatment groups and placebo.
Difference in Average Weekly Pain Score Between Dose Groups as Assessed by Daily Diary	Baseline to 12 week treatment period	Average 24-hour pain intensity was assessed daily based on the 11-point Likert-type numerical rating scale for pain (0=no pain, to 10=worst possible pain). Average weekly pain scores are defined as 7\* \[(Pain Day 1 + Pain Day 2 + ...+ Pain Day n)\]/n where n is the number of available diary entries for the week. The minimum pain score for a week would be 0 and the maximum would be 70. Difference in the average weekly pain score at Week 12 is the score for each week minus the baseline .
Difference in Average Weekly Most Severe Pain Score Between Dose Groups as Assessed by Daily Diary	Baseline to 12 week treatment period	Most severe 24-hour pain intensity was assessed daily based on the 11-point Likert-type numerical rating scale for pain (0=no pain, to 10=worst possible pain). Average weekly most severe pain scores are defined as 7\* \[(Pain Day 1 + Pain Day 2 + ...+ Pain Day n)\]/n where n is the number of available diary entries for the week. The minimum possible pain score for a week would be 0 and the maximum possible would be 70. Difference in the average weekly pain score at Week 12 is the score at each week minus baseline .
Difference in Average Weekly Overnight Pain Score Between Dose Groups as Assessed by Daily Diary	Baseline to 12 week treatment period	Overnight pain intensity was assessed daily based on the 11-point Likert-type numerical rating scale for pain (0=no pain, to 10=worst possible pain). Average weekly overnight pain scores are defined as 7\* \[(Pain Day 1 + Pain Day 2 + ...+ Pain Day n)\]/n where n is the number of available diary entries for the week. The minimum possible pain score for a week would be 0 and the maximum possible would be 70. Difference in the average weekly overnight pain score at Week 12 is the score at each week minus baseline
Change From Baseline Within Group- Difference in Average Weekly Pain Score Compared to Baseline as Assessed by Daily Diary	Baseline to 12 week treatment period	Average weekly pain intensity was assessed daily based on the 11-point Likert-type numerical rating scale for pain (0=no pain, to 10=worst possible pain). Average weekly pain scores are defined as 7\* \[(Pain Day 1 + Pain Day 2 + ...+ Pain Day n)\]/n where n is the number of available diary entries for the week. The minimum possible pain score for a week would be 0 and the maximum possible would be 70. Difference in the average weekly pain score at Week 12 is the score at each week minus baseline.
Average Weekly Rescue Medication Use	Week 1 to Week 12	During the Treatment Periods, subjects taking 500 mg acetaminophen or Tylenol® for severe pain recorded the frequency and dosage in the daily diary. The use of 500 mg acetaminophen or Tylenol® was recorded for Morning, Afternoon or Evening time. For each subject, the total weekly rescue medication was calculated, and it was used to assess average weekly rescue medication use.
Change From Baseline Within Group-Difference in Average Weekly Overnight Pain Score Compared to Baseline as Assessed by Daily Diary	Baseline to 12 week treatment period	Overnight pain intensity was assessed daily based on the 11-point Likert-type numerical rating scale for pain (0=no pain, to 10=worst possible pain). Average weekly overnight pain scores are defined as 7\* \[(Pain Day 1 + Pain Day 2 + ...+ Pain Day n)\]/n where n is the number of available diary entries for the week. The minimum possible pain score for a week would be 0 and the maximum possible would be 70. Difference in the average weekly overnight pain score at Week 12 is the score at each week minus baseline
Number of Participants Considered to be Responders on Global Impression of Improvement (PGI-I) at Week 12	Week 12	PGI measures the subject's overall improvement in pain. The assessment was to be completed each week during the Treatment Phase. Global impression of improvement was assessed by the subject based on a 7 point scale (1-very much improved, 2-much improved, 3-minimally improved, 4-no change, 5-minimally worse, 6-much worse, 7-very much worse. Responders are defined as subjects with response of "very much improved", "much improved" or "minimally improved"
Number of Participants Number of Participants Considered to be Responders in Clinical Global Impression (CGI) at Week 12	Week 12	CGI measures global severity of illness at a given point of time and the improvement from baseline. The assessment was to be completed by the Investigator at baseline and each week during the treatment phase. CGI responders were defined as subjects achieving a score of: (1): Very much improved or (2): Much improved or (3): Minimally improved on the clinician-rated CGI global improvement item.

Trial Locations

Locations (14): Diablo Clinical Research
🇺🇸
Walnut Creek, California, United States
Center for United Research, Inc.
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Lakewood, California, United States
Clinical Research Consulting, LLC
🇺🇸
Milford, Connecticut, United States
Metabolic Research Institute, Inc.
🇺🇸
West Palm Beach, Florida, United States
PAB Clinical Research
🇺🇸
Brandon, Florida, United States
Rainier Clinical Research Center, Inc.
🇺🇸
Renton, Washington, United States
Novex Clinical Research, Inc.
🇺🇸
New Bedford, Massachusetts, United States
Johns Hopkins University
🇺🇸
Baltimore, Maryland, United States
Albany Medical Center
🇺🇸
Albany, New York, United States
KRK Research
🇺🇸
Dallas, Texas, United States
Coastal Carolina Research Center
🇺🇸
Mount Pleasant, South Carolina, United States
North Texas Endocrine Center
🇺🇸
Dallas, Texas, United States
Wasatch Clinical Research
🇺🇸
Salt Lake City, Utah, United States
Houston Foot & Ankle Care
🇺🇸
Houston, Texas, United States