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BACKGROUND/AIM It remains challenging to select patients with non-small cell carcinoma (NSCLC) for nivolumab monotherapy. We evaluated whether early termination of nivolumab monotherapy correlated with pretreatment neutrophil/lymphocyte ratio (NLR) and prognostic nutritional index (PNI). PATIENTS AND METHODS Twenty patients received nivolumab monotherapy for NSCLC with wild-type epidermal growth factor receptor (EGFR) and anaplastic lymphoma kinase (ALK) during 2016. Early termination and continued therapy were defined as ≤5 and ≥6 cycles of monotherapy, respectively. RESULTS Early termination and continued therapy groups included 9 and 11 patients, respectively. High pretreatment NLR and low pretreatment PNI were significantly associated with early termination of nivolumab, both in an overall analysis (p<0.001 and p=0.016) and in subgroup analyses of patients with performance scores of 0-1 and ≥30 days of pretreatment drug holidays. CONCLUSION High NLR and low PNI were associated with early termination of nivolumab monotherapy, suggesting they might be useful biomarkers for treatment selection.