RecruitingPhase 2Biological interventionEfficacy and Safety Study of TPX-115 on Partial-thickness Rotator Cuff TearThe goal of this study is to evaluate the efficacy and safety of allogeneic dermal fibroblasts (TPX-115) compared to placebo in patients with Partial-Thickness Rotator Cuff Tear(PTRCT). Primary endpoint is to evaluate the efficacy of TPX-115 compared to placebo, as measured by improvement in the Constant-Murley Score (CMS) in patients with PTRCT. Secondary endpoints are: * To evaluate functional (including shoulder pain) and structural improvements in the affected shoulder after administration of TPX-115 compared to placebo in patients with PTRCT * To evaluate the safety and tolerability of TPX-115 in patients with PTRCT * To assess the immunogenicity of TPX-115