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A Randomized, Double-Blind, Placebo-Controlled, Exploratory Study of MT-8554 in Subjects with Painful Diabetic Peripheral Neuropathy

Exploratory Study of MT-8554 in Subjects with Painful Diabetic Peripheral Neuropathy

Kondou Kazuoki

Mitsubishi Tanabe Pharma Corporation

1-1-1, Marunouchi Chiyoda-ku, Tokyo

cti-inq-ml@ml.mt-pharma.co.jp

Information Desk Clinical Trials

Mitsubishi Tanabe Pharma Corporation

1-1-1, Marunouchi Chiyoda-ku, Tokyo

+81-3-5960-9608

cti-inq-ml@ml.mt-pharma.co.jp

Complete

Nov. 01, 2021

Interventional

randomized controlled trial

double blind

placebo control

parallel assignment

treatment purpose

(1) Patients with written consent
(2) Patients aged >=20 years at the time of consent
(3) Outpatients
(4) Patients with pain associated with peripheral symmetric polyneuropathy due to diabetes mellitus and pain lasting >=3 months on the first day of the run-in period. The patient should meet >=2 of the following criteria or nerve conduction studies showing abnormalities in at least one test item (Conduction velocity, amplitude, and latency) for at least two nerves by the first day of run-in period.
1. Subjective symptoms* thought to be due to diabetic polyneuropathy
2. Decreased or eliminated bilateral Achilles tendon reflexes
3. Bilateral decreased vibratory sense of the medial malleolus (=< 10 seconds with a C 128 tuning fork)
*Subjective symptoms thought to be due to diabetic neuropathy meet the following 3 criteria.
- Bilateral
- Toe and plantar symptoms (Numbness, pain or dysesthesia)
- Does not cause upper extremity symptoms alone
(5) Patients whose NRS during the run-in period is assessed for >=4 days of the 7 days immediately before the first day of the treatment period and whose baseline 24-hour mean NRS score is >=4 and =<8.
(6) Patients whose rate of change in the 24-hour mean NRS score during the 7 days immediately before the first day of the treatment period is <30%.
(7) Patients whose treatment for diabetes mellitus is consistent >=8 weeks before the run-in period, who can consistently maintain the treatment throughout the study period, and in whom the investigator (or sub-investigator) can determine that glycemic control is constant.

(1) Patients with pain, disease, or skin condition that, in the opinion of the investigator (or sub-investigator), would influence the evaluation of painful diabetic peripheral neuropathy.
For example, if other pain is in the same location as painful diabetic peripheral neuropathy, or if the pain intensity of the other pain is greater than that of painful diabetic peripheral neuropathy, which in the opinion of the investigator (or sub-investigator) would impact the assessment of painful diabetic peripheral neuropathy.
(2) Patients who have had amputation of upper and lower limbs other than toes due to gangrene caused by impaired blood circulation.
(3) Patients who do not meet the criteria of prohibited concomitant drugs or restricted concomitant drugs.
(4) Patients with hypersensitivity to acetaminophen or a history of hypersensitivity to acetaminophen.
(5) Patients with New York Heart Association functional class III or IV symptoms of heart failure.
(6) History of myocardial infarction, congestive heart failure, unstable angina, or cerebrovascular disorder (excluding lacunar infarction) within 6 months prior to informed consent.
(7) Patients with major psychiatric disorder such as depression or anxiety disorder.
(8) Patients with drug abuse or a history of drug abuse.
(9) Patients with current or previous infection with human immunodeficiency virus (HIV), hepatitis B virus (HBV) or hepatitis C virus (HCV). However, patients with previous infection with hepatitis B virus who are HBsAg-negative are eligible.
(10) Patients with HbA1c > 10.5%.
(11) Patients with poorly controlled hypertension (>= 180 mmHg systolic and/or >= 110 mmHg diastolic).
(12) Patients with eGFR < 30 mL/min/1.73 m^2.
(13) Patients with AST or ALT > 2.5 * ULN.
(14) Patients who answered "Yes" to any item of Columbia Suicide Severity Rating Scale within the past 12 months.
(15) Patients who have a concomitant malignancy or a history of malignancy. However, patients who have a history of malignancy but have not experienced recurrence for at least 5 years before informed consent (patients who have not experienced recurrence for at least 5 years after the last administration if they were receiving anticancer drugs) will be excluded.
(16) Male or female patients of childbearing potential who do not agree to use contraception from the date of informed consent until 3 months after the completion (discontinuation) of investigational product.
(17) Female patients who are pregnant, breastfeeding or possibly pregnant.
(18) Patients who participated in another clinical study and received investigational product within 12 weeks before informed consent.
(19) Prior exposure to MT-8554.
(20) Other patients who, in the opinion of the investigator (or sub-investigator), are ineligible for this study.

Both

Painful Diabetic Peripheral Neuropathy

MT-8554 Group: MT-8554 will be started from a low dose, and gradually increase the dose in order while confirming its tolerability. Then, continue treatment at the maximum dose that is confirmed to be tolerable. MT-8554 will be administered for a total of 12 weeks.
Placebo group: Placebo will be administered for 12 weeks.

Change from baseline in the weekly mean 24-hour average NRS score at Week 12 in treatment period

(1) Change from baseline in weekly mean 24-hour average NRS score at each assessment point
(2) Average weekly 24-hour NRS score during the 12 week treatment period 30% and 50% responder rates
(3) Change from baseline in weekly mean daily NRS score at each assessment point
(4) Change from baseline in weekly mean nocturnal average NRS score at each assessment point
(5) Change from baseline in weekly mean 24-hour worst NRS score at each assessment point
(6) Change from baseline in NPSI at each assessment point
(7) Change from baseline in BPI pain severity and functional impairment at each assessment point
(8) Change from baseline in MOS-SS at each assessment point
(9) Proportion of PGIC responders at each assessment point
(10) Proportion of CGIC responder at each assessment point

+81-77-563-8866

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Plan Description: When requested by a qualified researcher in the field of science or medicine, Mitsubishi Tanabe Pharma Corporation (MTPC) will share clinical trial data that was collected from individual patients in a clinical trial with that researcher after a review committee of experts determines that such sharing is appropriate. Access Criteria: Please refer to the following link for conditions and limitations for sharing data. URL: https://www.mt-pharma.co.jp/e/develop/protocol/

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