A Long-Term Safety and Efficacy Study of Lorecivivint in Subjects With Osteoarthritis of the Knee

This study is designed as a long-term extension to the Phase 3 parent-study SM04690-OA-11. It aims to evaluate the safety and efficacy of long-term use of lorecivivint (LOR) in subjects with knee osteoarthritis (OA). The first 48 weeks will be single-blind and placebo-controlled while the remainder of the study will be open-label and uncontrolled. Subjects must enroll no later than 6 weeks following completion of the parent-study.

At the first visit (Day 1), all subjects will complete Patient Acceptable Symptom State (PASS) and pain Numeric Rating Scale (NRS) assessments and then receive a blinded study injection into their target knee (the same target knee injected in the parent study), with subjects receiving the same treatment (either 0.07 mg LOR or placebo) as they received in the parent study. Subjects will have clinic visits for pain and function assessments, collection of adverse events, and knee radiographs. At Week 48, all subjects, regardless of previous treatment, will receive an injection of 0.07 mg LOR into their target knee. Subjects will receive injections of 0.07 mg LOR into their target knee every 52 weeks thereafter until end of study.

Eligibility Criteria:
Inclusion Criteria:

1. Completion of the Samumed study SM04690-OA-11
2. Compliance with procedures in study SM04690-OA-11, in the opinion of the Investigator
3. Fully understanding study requirements and willingness to comply with study visits and assessments
4. Understanding and signing of the informed consent form (ICF) prior to any study-related procedures

Exclusion Criteria:

1. Any condition that, in the opinion of the Investigator, constitutes a risk or contraindication for participation in the study or that could interfere with the study objectives, conduct, or evaluation
2. Any contraindications for an intra-articular (IA) injection in the target knee in the opinion of the Investigator
3. Any known reason identified by the Investigator or Sponsor that the subject may not be compliant with study visits or may no longer be an appropriate candidate for the study (e.g. planned major surgery, knee replacement during the parent study, planning to move away from the research site, or initiation of a prohibited concomitant medication including, but not limited to, IA injection of glucocorticoids, hyaluronic acid derivatives, platelet-rich plasma, stem cell therapies, or other agents with therapeutic intent into the target knee)
4. Participation in a clinical research trial (other than the prior SM04690-OA-11 study) that included the receipt of an investigational product (IP) or any experimental therapeutic procedure within 12 weeks before any study injection, or planned participation in any such trial
5. Current or pending disability claim, workers' compensation, or litigation(s) that may compromise response to treatment
6. Pregnant women, breastfeeding women, and women who are not post-menopausal (defined as 12 months with no menses without an alternative medical cause) or permanently surgically sterile (includes hysterectomy, bilateral salpingectomy, and bilateral oophorectomy) who have a positive or indeterminate pregnancy test result at Visit 1E (Day 1)
7. Women who are not post-menopausal or permanently surgically sterile who are sexually active, and who are not willing to use birth control (as outlined in the protocol) during the study period