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MINI 31 - ALK (ID 158)
- Event: WCLC 2015
- Type: Mini Oral
- Track: Treatment of Advanced Diseases - NSCLC
- Presentations: 1
MINI31.08 - Real-World Persistence and Adherence to Crizotinib in over 3800 US Patients (ID 835)
18:30 - 20:00 | Author(s): R. Horblyuk
Crizotinib is an oral tyrosine kinase inhibitor that has been studied in patients with advanced ALK-positive non-small cell lung cancer and has demonstrated median therapy durations ranging from 23 weeks to 10.9 months. In the real-world setting, persistence and adherence to oral therapies may be suboptimal compared with physician-administered treatments. Little is known about crizotinib treatment experiences outside of clinical trials. The objective of this analysis was to evaluate persistence on and adherence to crizotinib using US pharmacy records.
De-identified records from five closed-distribution US specialty pharmacies supplying crizotinib in the 50 states and US territories were analyzed. Patients with at least one record of a shipped crizotinib prescription between 8/30/2011 and 8/1/2014 were eligible. Persistence − the duration of time from initiation to discontinuation of therapy − was defined as the total number of days between the first and last prescription shipment dates plus the days' supply of the last prescription. Adherence − the extent to which a patient acts in accordance with the prescribed regimen − was evaluated using a medication possession ratio (MPR): the ratio of the total days' supply over the entire duration of therapy for patients with at least two crizotinib prescriptions. A grace period of 60 days between prescriptions was allowed. Sensitivity analyses of persistence and adherence were performed assuming grace periods between prescriptions of 30 and 90 days.
A total of 3845 crizotinib patients were identified and included in the analysis. Most were commercially insured (69%), <65 years of age (61%), and female (56%). The cohort was well balanced geographically. Most prescriptions (89%) were for doses of 250 mg BID. Average duration of therapy was 11.4 months (95% CI: 11.2−11.6), with a median of 7.5 months. 51% and 34% of patients remained on therapy at 6 and 12 months, respectively. 16% of patients remained on crizotinib >24 months (Figure 1). Figure 1 An average MPR of 95% was observed in the sub-cohort of 3072 patients with two or more prescriptions of crizotinib. Sensitivity analyses revealed that persistence (11.2−11.6 months) and adherence (93−96%) estimates were not impacted by the alternative grace-period definitions applied.
In the real-world setting, the duration of crizotinib therapy was similar to that reported in clinical trials. Adherence to crizotinib was high and may be indicative of its acceptable tolerability. Further research is warranted to evaluate experiences associated with crizotinib using other real-world data sources.
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