1. Neoadjuvant nivolumab plus chemotherapy led to a longer event-free survival and higher percentage of patients with a pathological complete response.
2. Addition of neoadjuvant nivolumab did not increase the incidence or severity of adverse events, nor did it impact the feasibility of surgery.
Evidence Rating Level: 1 (Excellent)
Study Rundown: Neoadjuvant immunotherapy is an evolving treatment strategy in certain cancers due to its ability to enhance the body’s immune system when tackling micrometastatic disease. This study explored the efficacy and safety of nivolumab (an anti-programmed death 1 antibody) as a neoadjuvant for patients with resectable non-small-cell lung cancer (NSCLC). These patients were randomly assigned to receive neoadjuvant nivolumab and chemotherapy, or chemotherapy alone, both followed by surgery. Median event-free survival (EFS) in the nivolumab group was longer and there was a higher percentage of patients with a pathological complete response. These results were consistent across most subgroups, with the highest magnitude of benefit in EFS being in stage IIIA disease patients. More patients in the nivolumab group underwent definitive surgery than the chemotherapy group. In the nivolumab group, median duration of surgery was shorter, minimally invasive procedures were more common, and pneumonectomies were less common. Addition of neoadjuvant nivolumab did not increase the incidence of adverse events and occurrence of grade 3 or 4 treatment-related adverse events were not significantly different between both groups. Most common grade 3 or 4 adverse events across both groups include neutropenia and decreased neutrophil count. Limitations to this study is that the data is not mature to indicate whether overall survival was different, and the issue adjuvant therapy was not answered by this study. Overall, addition of neoadjuvant nivolumab is a viable treatment option in resectable NSCLC.
In-Depth [randomized control trial]: This international, phase III trial randomly assigned 358 patients with stage IB to IIIA resectable NSCLC into two groups before having them undergo resection: 179 in the neoadjuvant nivolumab plus chemotherapy group and 179 in the chemotherapy alone group. Median EFS was 31.6 months in the nivolumab group and 20.8 months in the chemotherapy group (hazard ratio [HR] for disease progression, disease recurrence, or death, 0.63; 97.38% confidence interval [CI], 0.43 to 0.91; P=0.005). Percentage of patients with pathological complete response was 24.0% in the nivolumab group and 2.2% in the chemotherapy group (odds ratio, 13.94; 99% CI, 3.49 to 55.75; P<0.001). In the nivolumab and chemotherapy groups, 83.2% and 75.4% of patients underwent surgery, respectively. Incidence of adverse events of any cause in the nivolumab and chemotherapy groups were 92.6% and 97.2%, respectively. Incidence of grade 3 or 4 treatment-related adverse events were 33.5% and 36.9%, respectively, with neutropenia (8.5% vs. 11.9%, respectively) and decreased neutrophil count (7.4% and 10.8%, respectively) being the most common. Incidence of immune-mediated events in the nivolumab group were low and mainly consisted of grades 1 and 2. Most common immune-mediated events of any grade were rash (8.5%) and pneumonitis (1.1%). Overall, this study showed that nivolumab as a neoadjuvant therapy significantly increased EFS and yielded a higher percentage of pathological complete response than chemotherapy alone.
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