Leora Horn, MD
Treatment with the PD-1 inhibitor nivolumab (Opdivo) reduced the risk of death by 28% compared with docetaxel for patients with previously treated nonsquamous non–small cell lung cancer (NSCLC), according to updated findings from the phase III CheckMate-057 study that were presented at the 2015 European Cancer Congress and simultaneously published in The New England Journal of Medicine
At a minimum follow-up of 17.2 months, the overall survival (OS) rate with nivolumab was 39% compared with 23% for docetaxel. The median OS with nivolumab was 12.2 versus 9.4 months with docetaxel (HR, 0.72; 95% CI, 0.60-0.88; P
<.001). The 1-year progression-free survival (PFS) rates were 19% and 8% and the objective response rates (ORR) were 19% and 12%, with nivolumab and docetaxel, respectively.
Adverse events (AEs) were significantly less frequent with nivolumab compared with docetaxel. The rates of all-grade AEs were 69% and 88%, with nivolumab and docetaxel. Grade 3/4 AEs occurred in 10% of patients treated with nivolumab compared with 54% for docetaxel.
“These longer term survival results for nivolumab in advanced, nonsquamous non–small cell lung cancer support the potential for this immuno-oncology agent in treating lung cancer patients,” lead investigator Leora Horn, MD, from the Vanderbilt-Ingram Cancer Center, said in a statement. “CheckMate-057 builds upon its critical findings and now, data show a sustained survival benefit for nivolumab in this hard-to-treat disease that is incredibly encouraging for oncologists, and most importantly, for our patients.”
In the open-label CheckMate-057 trial, 582 patients with advanced nonsquamous NSCLC were randomized after the failure of platinum-based doublet chemotherapy to nivolumab at 3 mg/kg IV every 2 weeks (n = 292) or docetaxel at 75 mg/m2
intravenously every 3 weeks (n = 290). The median patient age was 62 years and most had an ECOG performance status of 1. A median of 6 doses of nivolumab were administered versus 4 doses of docetaxel.
Prior maintenance with bevacizumab, pemetrexed, or erlotinib was allowed, as was TKI therapy for those with a known EGFR
mutations or ALK
translocation. Forty-percent and 38% of patients in the nivolumab and docetaxel arms, respectively, had received prior maintenance therapy. In the nivolumab arm, 15% of patients were EGFR
-positive and 4% were ALK
-positive, with comparable rates of 13% and 3%, respectively, in the docetaxel group.
For those who received nivolumab the median time to response was 2.1 months compared with 2.6 months with docetaxel. The median duration of response (DoR) was 17.2 months with nivolumab and 5.6 months with docetaxel. Subsequent therapies were received by 42% in the nivolumab arm and by 50% with docetaxel.
The median PFS was 2.3 months with nivolumab compared with 4.2 months with docetaxel (HR, 0.92; 95% CI, 0.77-1.1; P
= .39). This lower numerical median PFS with nivolumab could be explained by pseudoprogression. After initial progression 71 patients (24%) in the nivolumab arm continued to receive treatment, with 16 (23%) having a nonconventional response.
In patients with quantifiable PD-L1 expression (n = 455; 78%), there was a greater benefit seen with nivolumab compared with docetaxel for those with ≥1% staining. However, in those with expression <1% those treated with docetaxel (n = 101) had an ORR of 15% compared with 9% with nivolumab (n = 108).
In those with the highest expression of PD-L1 (≥10%), the ORR with nivolumab was 37% with a median DoR of 16 months compared with an ORR of 13% and a DoR of 5.6 months with docetaxel (odds ratio, 4.1; 95% CI, 1.8-10.1). In those with PD-L1 expression ≥1% the ORR was 31% and the DoR was 16 months with nivolumab (n = 123) versus an ORR of 12% and a DoR of 5.6 months with docetaxel (n = 123).
The most common grade 3/4 AEs with nivolumab were fatigue, nausea, and diarrhea, at 1% each. Twenty-seven percent of patients in the docetaxel arm had grade 3/4 neutropenia versus 0 in the nivolumab arm. Toxicity-related discontinuations occurred in 5% of patients receiving nivolumab compared with 15% of those treated with chemotherapy.
“The 18-month data from CheckMate-057 reinforce the potential for Opdivo, across PD-L1 expression levels, to offer patients durable overall survival benefit with lower incidence of serious adverse events versus chemotherapy,” Michael Giordano, MD, senior vice president, head of Development, Oncology at Bristol-Myers Squibb, the company developing the drug, said in a statement.
On September 2, 2015, the FDA granted nivolumab both a breakthrough therapy designation and a priority review for patients with previously treated nonsquamous NSCLC. Both designations were based on data from the phase III CheckMate-057 trial. Under this expedited review process, the FDA’s decision deadline is January 2, 2016.