Abstract
Lung immune prognostic index is based on derived neutrophil-to-lymphocyte ratio and lactate dehydrogenase level. Lung immune prognostic index has reported association with survival outcomes in patients with various malignancies undergoing treatment with immune checkpoint inhibitors. However, the prognostic impact of pre-treatment lung immune prognostic index in patients with metastatic renal cell carcinoma receiving nivolumab plus ipilimumab treatment remains unclear. This study examines the association between lung immune prognostic index and outcomes in this setting. We retrospectively evaluated 156 patients with metastatic renal cell carcinoma treated with nivolumab plus ipilimumab at eight institutions. We assessed the associations between pre-treatment lung immune prognostic index and survival outcomes including progression-free survival, second progression-free survival (PFS2), cancer-specific survival and overall survival. Patients were classified into good (n=84, 54%), intermediate (n=52, 33%) and poor (n=20, 13%) lung immune prognostic index groups. Progression-free survival did not significantly differ between lung immune prognostic index groups, but there was significant difference in PFS2, cancer-specific survival and overall survival. In multivariable Cox proportional hazard analyses, high pre-treatment lung immune prognostic index was a significant predictor of poor PFS2 (vs. good group, intermediate group: P=0.01 and poor group: P=0.04) and poor overall survival (vs. good group, intermediate group: P=0.01 and poor group: P<0.01). Moreover, the patients with poor lung immune prognostic index had significantly poorer cancer-specific survival than those with good LIPI (P<0.01). High pre-treatment LIPI is suggested by our results to be a significant independent predictor of poor prognosis in patients receiving nivolumab plus ipilimumab for metastatic renal cell carcinoma.
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