This is a multicentre, descriptive observational study of adult patients with primary HPT
receiving cinacalcet in clinical practice in a number of countries in Europe. Patients will
be enrolled within 1 month of initiating cinacalcet treatment, and data will be collected
prospectively for up to 1 year from initiation. Data will continue to be collected from
patients discontinuing cinacalcet before the end of this period.