Comparison of rates of adherence to oral chemotherapy medications filled through an internal health-system specialty pharmacy vs external specialty pharmacies.

Purpose: The primary objective of the study described here was to compare rates of patient adherence to anticancer medications filled at an internal health system specialty pharmacy (HSSP) vs external specialty pharmacies. The primary outcome was the medication possession ratio (MPR), and the secondary outcomes included proportion of days covered (PDC), and time to treatment (TTT).

Methods: A retrospective chart review was conducted to compare the MPR, PDC, and TTT for patients who received oral anticancer therapy using prescriptions claim data.