Adoption Of Immunotherapy Into Real-World Practice: Insights From The Use Of Checkpoint Inhibitors.

e14583 Background: Cancer research has been criticized regarding the generalizability of trials to older persons, as well as the timeliness of the impact of new trials on real-world practice. Despite growing enthusiasm about programmed death 1 checkpoint inhibitors (anti-PD1s), little is known about the speed with which these drugs are adopted into real-world practice, or whether anti-PD1 treated patients in real-world practice are older than patients treated in trials. Methods: We used retrospective data from Flatiron Health’s electronic health record database, which includes 250 cancer clinics and 1.5 million patients with cancer. We identified patients diagnosed after January 1, 2011 who underwent systemic therapy for: advanced melanoma (n=1,670), advanced non-small cell lung cancer (aNSCLC; n=19,536), or metastatic renal cell carcinoma (mRCC; n=2,018). Then, we determined the proportion treated with anti-PD1s in the 2 nd line or later following US Food and Drug Administration (FDA) approval. Therapy lines containing study drugs were excluded. Chi-square tests were used to compare age distributions of patients treated in real-world practice to patients treated in trials that support FDA approval. Results: At 6 months following FDA approval, 71.9% of patients with melanoma undergoing treatment were receiving anti-PD1s, versus 33.0% of patients with aNSCLC and 46.0% of patients with mRCC. Within 1 year, more than half of all treated patients with these 3 cancers were receiving anti-PD1s (71.0% in melanoma; 51.4% in aNSCLC; and 51.8% in mRCC). The median ages at first receipt of anti-PD1s were ≥65 years (65.1 years in melanoma; 67.9 years in aNSCLC; 66.0 years in mRCC). Anti-PD1 treated patients were significantly older in real-world practice than patients treated in trials (Table: all p<0.001). Conclusions: In a large national sample of patients with cancer, anti-PD1s were adopted rapidly into real-world practice. Compared to patients treated in real-world practice, older patients were underrepresented in clinical trials. [Table: see text]