Clinical trial NCT05025787: A Study to Evaluate the Safety and Efficacy of CNTX-6970 in Subjects With Knee Osteoarthritis Pain.
Official title: EN20-01: A 24 Week Study to Evaluate the Safety and Efficacy of CNTX-6970 in Subjects With Moderate to Severe Knee Osteoarthritis Pain.
Study type: INTERVENTIONAL
Overall status: COMPLETED
Phase: PHASE2
Conditions: Knee Osteoarthritis
Lead sponsor: Massachusetts General Hospital
Sponsor class: OTHER
First posted: 2021-08-27
Enrollment: 77
Sex: ALL
Minimum age (years): 40
Maximum age (years): 90
Standard ages: ADULT
OLDER_ADULT
Accepts healthy volunteers: no
Allocation: RANDOMIZED
Intervention model: CROSSOVER
Intervention model description: The study will employ a randomized, allocation-concealed, multicenter, placebo-controlled, multi-period crossover design.
Primary purpose: TREATMENT

Brief summary: The primary objective of this study is to evaluate the safety and efficacy of CNTX-6970 for the treatment of pain related to OA of the knee compared to placebo. CNTX-6970 is being developed as a new treatment for chronic pain, including painful osteoarthritis of the knee.

Detailed description: The study will employ a randomized, allocation-concealed, multicenter, placebo-controlled, multi-period crossover design (Schmid et al, 2018). This multi-period crossover randomized, controlled trial allows comparability and assessment of efficacy through repeated exposures within each subject to the active treatment and a control (placebo) in randomized sequence. Such multi-period crossover designs are ideal for treatments with rapid onset of action and short half-life such as the asset under study here. We have strived to minimize the complexity of this powerful design by using only 2 blocks with 2 periods each. The modest additional complexity of the proposed multi-period crossover design, compared to a parallel-groups design, is justified by the marked improvement in efficiency. The gains in efficiency afforded by the multi-period crossover design allow a substantial reduction in sample size without sacrificing statistical power.

The trial will compare an active treatment vs. placebo. Each block will consist of two treatment periods with each period lasting 6 weeks. Treatment assignments (active drug versus placebo) will be randomized for each patient to the two periods within each block. The period length of 6 weeks was chosen based on several considerations: (i) Most efficacious analgesic drugs demonstrate separation from placebo by 6 weeks; (ii) The decision to move CNTX-6970 forward to Phase 3 will require a clinically meaningful separation from placebo by 6 weeks; (iii) In this Phase 2 study, implementing a treatment block longer than 6 weeks would make the overall design more challenging and burdensome by extending the duration of overall testing beyond 6 months; (iv).

In this study, the placebo will consist of inactive tablets identical to the active treatment tablets. Treatment assignments (active drug versus placebo) will be randomized for each patient to the two treatment periods within each block.

Eligibility criteria: A subject will be eligible for study participation if they meet all of the following criteria:

1. Individuals between 40 and 90 years of age (inclusive) at the time of the Screening Visit.
2. Willing to use a mobile smart device during the study period. Individuals who do not have access to a mobile device will be provided with one for the duration of the study and trained in its use.
3. Can understand the nature of the study and protocol requirements and is willing to comply with study drug administration requirements and discontinue prohibited concomitant medications.
4. Radiography of both knees with a posterior-anterior, fixed-flexion view taken during the Screening visit. The Index knee must show evidence of chronic OA with a K-L Grading Scale of 1, 2, 3, or 4. Such evidence will be provided by a central reading of the radiography of both knees from an expert radiologist of the CCC of EPPIC-Net.
5. Moderate to severe pain in the Index knee associated with OA and stable for a minimum of 6 months prior to Screening in the opinion of the investigator.
6. Confirmation of OA of the index knee: American College of Rheumatology (ACR) diagnostic criteria.
7. Subjects must have failed 2 or more prior therapies. Failure is deemed to be inadequate relief in the opinion of the investigator.
8. Body mass index (BMI) of ≤ 40 kg/m2.
9. Willing to refrain from illicit drug use during the study, and to have illicit drug testing at screening and at later time points.

A subject will be excluded from the study if they meet any of the following criteria:

1. Any form of joint replacement surgery, open surgery, or arthroscopic surgery of the index knee/knee joint with 12 months of Screening.
2. Any painful condition(s) of the index knee due to disease other than OA. For example, periarticular or referred pain involving the index knee, or from joint disease other than OA associated with the index knee.
3. Other chronic pain anywhere in the lower extremities (e.g. hips, legs, feet) that is equal or greater in intensity or impairment than index knee pain or that requires the use of analgesic medications. This includes radicular low back pain with radiation to the knee.
4. Documented history of neuropathic arthropathy in the knee.
5. Significant instability (e.g., cruciate ligament tear or rupture or previous repair) within the past 5 years or current misalignment (\>10 degrees varus or valgus) of the index knee.
6. Plans to have surgery, invasive procedures, or intra-articular (IA) injections of the index knee or procedure or surgery otherwise contraindicated for study participation while in the study.

   a. Concomitant Medications for Pain - i. Continuous use of one of the following medications prescribed for pain: tramadol, gabapentin, duloxetine, pregabalin, milnacipran, or tricyclic antidepressants that is:
   1. chronic for at least 12 weeks; and
   2. at a stable dose for at least 4 weeks before Screening ii. Intermittent use of opioids that is:

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   1. ongoing for at least 4 weeks before Screening;
   2. at a frequency no more than 4 days/week; and
   3. not be taken within 24 hours of a study visit

   iii. As needed use of acetaminophen iv. Continuous use of medical marijuana (or equivalent) that is chronic for at least 12 weeks and at a stable dose for 4 weeks v. Topical creams (includes CBD topicals)
   1. Continuous use allowed if chronic and stable for at least 12 weeks
   2. Intermittent use allowed if at a frequency of no more than 4 days/week

   b. Concomitant Medications for Non-Pain Indications That May Impact Pain - i. Continuous use of medication for non-pain indications that are known to potentially impact pain, e.g. duloxetine for depression, that is at a stable dose for at least 12 weeks prior to Screening.

   ii. Low-dose aspirin for the purposes of heart disease prophylaxis
7. Corticosteroid injection in the index knee within 30 days of Screening or during study participation (unless the injectable is a long-acting agent such as triamcinolone acetonide extended-release injectable suspension (Zilretta) in which case the injection cannot be within 90 days of screening).
8. Received IA viscosupplementation (e.g., Synvisc®, Hyalgan®) within 90 days of Screening.

10. Use of an investigational medication within 30 days of Screening, or 5 pharmacokinetic or pharmacodynamic half-lives (whichever is longer) or scheduled to receive such an agent while participating in the current study.

11. Current therapy with any immunosuppressive therapy, including corticosteroids (\>5 mg/day of prednisone).

Primary outcomes:
measure: Western Ontario and McMaster Universities Osteoarthritis Index (WOMAC-A)
timeFrame: 24 Weeks
measure: Treatment emergent adverse events (TEAEs)
timeFrame: 24 Weeks
Secondary outcomes:
measure: Numeric Rating Scale (NRS)
timeFrame: 24 Weeks
measure: Western Ontario and McMaster Universities Osteoarthritis Index (WOMAC-C)
timeFrame: 24 Weeks
measure: Hospital Anxiety and Depression Scale (HADS)
timeFrame: 24 Weeks
measure: PROMIS Sleep Disturbance Scale - 6A
timeFrame: 24 Weeks
measure: Patient Global Impression of Change (PGIC)
timeFrame: 24 Weeks
measure: Staircase-evoked pain assessment
timeFrame: 24 Weeks
measure: Serum levels of cytokines and chemokines
timeFrame: 24 Weeks
measure: MCP-1/CCR-2
timeFrame: 24 Weeks
Other outcomes:
Locations:
city: La Jolla
country: United States
facility: University of California San Diego
state: California
city: Sacramento
country: United States
facility: University of California- Davis
state: California
city: Gainesville
country: United States
facility: University of Florida
state: Florida
city: Miami
country: United States
facility: M&M Clinical Trials
state: Florida
city: Boston
country: United States
facility: Massachusetts General Hospital
state: Massachusetts
city: Hazelwood
country: United States
facility: Healthcare Research Network
state: Missouri
city: Bronx
country: United States
facility: Montefiore Medical Center
state: New York
city: New York
country: United States
facility: New York University Langone Health
state: New York
city: New York
country: United States
facility: Icahn School of Medicine at Mount Sinai
state: New York
city: Rochester
country: United States
facility: University of Rochester
state: New York
city: Winston-Salem
country: United States
facility: Center for Clinical Research
state: North Carolina
city: Philadelphia
country: United States
facility: University of Pennsylvania
state: Pennsylvania
city: Pittsburgh
country: United States
facility: University of Pittsburgh
state: Pennsylvania
city: Dallas
country: United States
facility: UTsouthwestern Medical Center
state: Texas
city: Seattle
country: United States
facility: University of Washington
state: Washington
city: Madison
country: United States
facility: University of Wisconsin- Madison
state: Wisconsin
Study officials:
affiliation: Massachusetts General Hosptial
name: Maurizio Fava, MD
role: PRINCIPAL_INVESTIGATOR
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