This single-group study was developed by the authors and conducted at two medical centers in the United States. The patients received two doses of intravenous nivolumab (at a dose of 3 mg per kilogram of body weight) every 2 weeks. It was planned that surgery would be performed approximately 4 weeks after the first dose. All the patients provided written informed consent.
The primary end points were safety and feasibility. The key secondary and exploratory end points were radiologic and pathological responses to treatment and immunologic, genomic, and pathological correlates of response in blood and tumor (Fig. S1 in Supplementary Appendix 1 , available with the full text of this article at NEJM.org ).
All the patients were monitored for adverse events, according to the National Cancer Institute Common Terminology Criteria for Adverse Events, version 4.0.12 Feasibility was prospectively defined as any delay in the planned surgery of no more than 37 days (i.e., a surgical delay of >30 days and 7 days for scheduling). In a safety run-in phase, an initial 6 patients were followed for perioperative adverse events of grade 3 or 4 for 90 days after the administration of the last nivolumab dose (or day 30 after surgery). With the goal of exploring the antitumor immune response in depth, the study then expanded to enroll a total of 20 patients who underwent complete tumor resection.
All the patients underwent baseline tumor staging, including pretreatment biopsy, pathological evaluation of mediastinal lymph nodes (if indicated) by means of bronchoscopy or mediastinoscopy, positron-emission tomography–computed tomography (PET–CT), and contrast-enhanced CT or magnetic resonance imaging of brain and chest; chest CT was repeated within 7 days before surgery. Changes in tumor size were evaluated according to Response Evaluation Criteria in Solid Tumors (RECIST), version 1.1.13 (link) Resection of the primary tumor and lymph nodes was completed according to institutional standards. All the patients were offered conventional adjuvant chemotherapy or radiotherapy, if such therapy was clinically indicated, and were followed for recurrence-free and overall survival.
The primary end points were safety and feasibility. The key secondary and exploratory end points were radiologic and pathological responses to treatment and immunologic, genomic, and pathological correlates of response in blood and tumor (
All the patients were monitored for adverse events, according to the National Cancer Institute Common Terminology Criteria for Adverse Events, version 4.0.12 Feasibility was prospectively defined as any delay in the planned surgery of no more than 37 days (i.e., a surgical delay of >30 days and 7 days for scheduling). In a safety run-in phase, an initial 6 patients were followed for perioperative adverse events of grade 3 or 4 for 90 days after the administration of the last nivolumab dose (or day 30 after surgery). With the goal of exploring the antitumor immune response in depth, the study then expanded to enroll a total of 20 patients who underwent complete tumor resection.
All the patients underwent baseline tumor staging, including pretreatment biopsy, pathological evaluation of mediastinal lymph nodes (if indicated) by means of bronchoscopy or mediastinoscopy, positron-emission tomography–computed tomography (PET–CT), and contrast-enhanced CT or magnetic resonance imaging of brain and chest; chest CT was repeated within 7 days before surgery. Changes in tumor size were evaluated according to Response Evaluation Criteria in Solid Tumors (RECIST), version 1.1.13 (link) Resection of the primary tumor and lymph nodes was completed according to institutional standards. All the patients were offered conventional adjuvant chemotherapy or radiotherapy, if such therapy was clinically indicated, and were followed for recurrence-free and overall survival.