Background: Pazopanib is a multi-tyrosine kinase inhibitor that is used to treat advanced soft-tissue sarcoma, and its efficacy has been confirmed in several clinical trials, although no clinically useful biomarkers have been identified. In other cancers, the neutrophil-to-lymphocyte ratio (NLR), the platelet-to-lymphocyte ratio (PLR), and the lymphocyte-to-monocyte ratio (LMR) are associated with chemotherapy response and prognosis. Therefore, we aimed to evaluate the associations of pazopanib response with NLR, PLR, and LMR among patients with advanced soft-tissue sarcoma.
Methods: Data regarding NLR, PLR, and LMR were obtained for 25 patients who received pazopanib for soft-tissue sarcoma. The patients were categorized according to their values for NLR (≥3.8 vs. <3.8), PLR (≥230 vs. <230), and LMR (≥2.4 vs. <2.4), and we evaluated the associations of these markers with progression-free survival and overall survival using Kaplan-Meier curves and Cox proportional models.
Results: No significant differences in progression-free survival or overall survival were observed based on the pre-treatment NLR, PLR, and LMR values. However, decreased NLR values after treatment using pazopanib were independently associated with significantly prolonged progression-free survival (hazard ratio: 0.07, p = 0.001) and overall survival (hazard ratio: 0.17, p = 0.0006).
Conclusions: Decreased NLR values after treatment using pazopanib may predict high efficacy and favorable outcomes among patients with advanced soft-tissue sarcoma.
Keywords: Chemotherapy; Neutrophil-to-lymphocyte ratio; Pazopanib; Soft-tissue sarcoma.