Impact of Nutritional Status on Neutrophil-to-Lymphocyte Ratio as a Predictor of Efficacy and Adverse Events of Immune Check-Point Inhibitors.

Simple Summary: Immune checkpoint inhibitors have become widely used against malignant tumors. The neutrophil-to-lymphocyte ratio, an index focusing on immune cells, has been reported as a marker to predict the efficacy and side effects of anti-tumor drugs. In the present study, we found that the neutrophil-to-lymphocyte ratio shows an altered predictability of anti-tumor efficacy and side effects due to changes in nutritional status. Patients with carcinoma in situ are prone to changes in nutritional status depending on the progression of the cancer and the age of the patient. We believe that the results of this study are important findings in predicting the course of treatment for cancer patients. The neutrophil -to-lymphocyte ratio (NLR) is useful for predicting the effectiveness of treatment with immune checkpoint inhibitors (ICIs) and immune-related adverse events (irAEs). Because a growing body of evidence has recently shown that the number of lymphocytes that comprise NLR fluctuates according to nutritional status, this study examined whether the usefulness of NLR varies in ICI treatment due to changes in nutritional status. A retrospective analysis was performed on 1234 patients who received ICI treatment for malignant tumors at our hospital. Progression-free survival (PFS) was significantly prolonged in patients with NLR < 4. Multivariate analysis revealed that the factors associated with the occurrence of irAE were NLR < 4 and the use of ipilimumab. However, when limited to cases with serum albumin levels <3.8 g/dL, lymphocyte counts significantly decreased, and the associations between NLR and PFS and between NLR and irAE occurrence disappeared. In contrast, when limited to the cases with serum albumin levels ≥3.8 g/dL, the associations remained, with significantly prolonged PFS and significantly increased irAE occurrence at NLR < 4. NLR may be a good predictive tool for PFS and irAE occurrence during ICI treatment when a good nutritional status is maintained. [ABSTRACT FROM AUTHOR]