EFFECTS OF LONG-TERM VALBENAZINE IN KINECT 4: POST HOC RESPONSE AND SHIFT ANALYSES IN YOUNGER AND OLDER ADULTS WITH TARDIVE DYSKINESIA

Introduction Tardive dyskinesia (TD) is a persistent and potentially disabling movement disorder associated with prolonged antipsychotic exposure. Compared to younger patients, older patients have a higher risk of TD and may develop symptoms earlier during antipsychotic treatment. Valbenazine, a novel and highly selective vesicular monoamine transporter 2 (VMAT2) inhibitor, is approved to treat TD in adults of all ages, with no dose adjustment required for older patients. The long-term effects of valbenazine on TD were evaluated in KINECT 4 (NCT02405091), an open-label study in which participants received up to 48 weeks of once-daily treatment with valbenazine. Abnormal Involuntary Movement Scale (AIMS) data from this study were analyzed post hoc to evaluate treatment responses in older (≥55 to 85 years) and younger (18 to Methods KINECT 4 included participants who met the following criteria: ages 18 to 85 years; DSM-IV diagnosis of schizophrenia, schizoaffective disorder, or mood disorder; neuroleptic-induced TD for ≥3 months prior to screening; stable psychiatric status (Brief Psychiatric Rating Scale score Results Of 163 participants in the safety/efficacy population, 103 (63.2%) had an available AIMS assessment at Week 48. At Week 48, the percentages of patients who met the criteria for minimal response (≥10% AIMS total score improvement from baseline) or clinically meaningful (≥30% improvement) response were similar between the older and younger subgroups (≥55 years; Conclusions After 48 weeks of treatment with once-daily valbenazine, >95% of all KINECT 4 participants (older and younger) had a minimal AIMS total score response (≥10% improvement), >90% had a clinically meaningful response (≥30% improvement), and >80% had a robust response (≥50% improvement). Older patients seemed more likely than younger patients to achieve a maximal response, including 100% improvement, although these results may be limited by smaller sample sizes. Shift analyses based on AIMS item scores were supportive of AIMS total score responses. Together, the results presented in this post hoc analysis suggest that valbenazine is an appropriate long-term treatment for both older and younger adults with TD. This research was funded by: This study was sponsored by Neurocrine Biosciences, Inc.