Treatment patterns, duration and outcomes of pemetrexed maintenance therapy in patients with advanced NSCLC in a real-world setting.

Objectives: In patients with non-squamous non-small-cell lung cancer (NSCLC), maintenance therapy regimens, including pemetrexed, have been shown to prolong overall survival (OS) and progression-free survival (PFS). The purpose of this study was to describe real-world maintenance use of pemetrexed and associated outcomes in patients with advanced NSCLC. Methods: This was a retrospective, observational study that used longitudinal, demographically and geographically diverse electronic health record data in the United States. Eligible patients were adults with advanced non-squamous NSCLC who had received maintenance treatment with pemetrexed monotherapy or pemetrexed plus bevacizumab. Descriptive statistics were used to describe the patient population and multivariable logistic regression was used to identify the factors associated with duration of maintenance therapy. Kaplan-Meier curves and Cox regression models were used for time-to-event analysis. Results: Patients receiving pemetrexed maintenance therapy were treated with either pemetrexed monotherapy (66.0%) or pemetrexed plus bevacizumab (34.0%). Carboplatin and pemetrexed (37.9%) or carboplatin, pemetrexed and bevacizumab (36.1%) were the most commonly used first-line therapies observed. The majority (84.9%) of these maintenance patients responded to first-line therapy. The median duration of maintenance therapy was 6.0 months for pemetrexed and bevacizumab and 4.1 months for pemetrexed monotherapy. The median OS from the start of first-line therapy of the total study cohort was 21.5 months (95% CI 20.0, 22.9). Conclusion: Real-world effectiveness of pemetrexed maintenance therapy is similar to that observed in published randomized controlled trials, confirming a role for pemetrexed maintenance in eligible patients in clinical practice.