The PD-1 immune checkpoint inhibitor nivolumab may be safe and effective as a first-line therapy in adult patients with non–small cell lung cancer (NSCLC), according to the results of the phase I CheckMate 012 trial.
Of 52 adult patients with advanced NSCLC who received nivolumab, 19% experienced grade three or four adverse events, and the overall response rate was 23% with four ongoing complete responses, reported Scott Gettinger, MD, of the Yale Cancer Center, New Haven, Conn., and his associates (J Clin Oncol. 2016 June. doi: 10.1200/JCO.2016.66.9929).
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In the study cohort, 94% had stage IV NSCLC, 79% were former or current smokers, and 65% had received either radiotherapy, adjuvant or neoadjuvant chemotherapy.
Treatment-related adverse events were reported in 71% of patients, the most common being fatigue (29%), rash (19%), and nausea (14%). Grade 3 or 4 adverse events including rash, cardiac failure, and lung infection occurred in 10 patients (19%). There were no treatment-related deaths, but adverse events led to the discontinuation of the drug treatment in six patients.
Responses to nivolumab (overall response rate, 23%) were durable with duration of responses ranging from 4.2 to 25.8 months. In addition, the median overall survival was 19.4 months, median progression-free survival was 3.5 months, and the 24-week progression-free survival rate was 31% (95% confidence interval, 28%-60%).
Forty-six patients had tumor specimens evaluable for PD-L1 expression. Clinical activity was observed regardless of PD-L1 expression, the investigators reported. However, the overall response rate was higher in patients with tumors that expressed PD-L1, compared with non-PD-L1-expressing tumors.
All investigators reported serving in advisory roles for, receiving financial compensation or honoraria from, or having ownership or stock in multiple companies including Bristol-Myers Squibb, which funded the study.
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