This Phase III study is a prospective, double-blind, parallel, multicenter, 2-arm study to evaluate the efficacy and safety of intra-articular ELIXCYTE injection compared to placebo in subjects with knee OA. All the subjects will be enrolled in Taiwan. Subjects aged 40 to 80 years with knee OA will be enrolled in the study. Approximately 165 eligible subjects will be randomized to receive either ELIXCYTE, or placebo in a 2:1 ratio.~The target population will be composed of subjects with unilateral or bilateral knee OA. For subjects with bilateral OA knees, only the knee with more severe symptoms will be selected as the target knee, while the non-target knee can continue the regular local treatment for ethical consideration. If the severities of the OA symptoms will be the same for both knees, the knee with more pain should be selected based on the WOMAC pain score. Eligible subjects will be randomized into one of the study groups (ELIXCYTE, or placebo in a 2:1 ratio).~The study consists of 9 visits and the duration per subject will be approximately 50 weeks (14 days of screening period, a treatment visit on Day 1, and 48 weeks of evaluation period). Unscheduled visit(s) may be arranged when deem necessary by the investigator.~In addition, if ELIXCYTE provided medical benefits with no safety issues to ELIXCYTE group at the end of week 48, subjects assigned to placebo group will be offered a treatment with ELIXCYTE under an extension study after study unblinding.
This is a Phase III, double-blinded, placebo-controlled, multicenter study to investigate the efficacy and safety of a new study intervention, ELIXCYTE, compared to placebo (normal saline) in subjects with knee osteoarthritis. The primary hypothesis of the study is to demonstrate that ELIXCYTE is superior to placebo (saline) in improving knee pain on the target knee from baseline.~During the study, each participant will receive either ELIXCYTE (study intervention) or placebo (normal saline) intra-articular injection once on the target knee after eligibility criteria check. The target knee will be assessed by X-ray, MRI and subject self-evaluation knee questionnaires (WOMAC, KSS and KOOS) in the following visits. Other safety assessments, including lab test, physical examination, vital sign, medical/medication history and adverse events will also be collected throughout the study.