Prospective Study Evaluating IncobotulinumtoxinA for Cervical Dystonia or Blepharospasm: Interim Results from the First 145 Subjects with Cervical Dystonia
Background: We report the interim results from XCiDaBLE: A large prospective, observational "naturalistic" study evaluating Xeomin® (incobotulinumtoxinA) for cervical dystonia or blepharospasm in the United States.
Methods: Subjects with CD are followed for 2 treatment cycles and monitored via Interactive Voice/Web Response. Subject-reported scales include the Subject Global Impression-Severity and Improvement; Cervical Dystonia Impact Profile (CDIP-58); and Work Productivity and Quality of Life (QoL) are assessed by means of an employment questionnaire and work history and the SF-12v2.
Results: This ongoing study includes 145 subjects with a diagnosis of CD. The majority were female (82.3%) and White (91.0%) and had previously been treated with botulinum toxins (77.2%). There were 106 employed at the time of onset of the disease, but 12.6 years later only 44% were still employed at the time of enrolment into the study and 20% were either receiving or seeking disability benefits. However, only 44% were still employed at the time of recruitment for study participation. The mean total dose/treatment of CD was 225.2 units for the 1st injection. The CDIP-58 total score was significantly improved at four weeks post the first injection compared to baseline (p=<0.0001). Most subjects noted improvement in their global impression assessment. No new or unexpected adverse events occurred.
Discussion: The results from these interim analyses confirm previous controlled single-dose studies of incobotulinumtoxinA in terms of efficacy and safety.