Objective: To investigate the value of neuron-specific enolase (NSE), neutrophil-to-lymphocyte ratio (NLR) and lymph node metastasis in predicating distant metastasis in patients with limited-stage small cell lung cancer (LD-SCLC).
Methods: Clinical pathological data of LD-SCLC patients in the First Affiliated Hospital of Wenzhou Medical University between August 2009 and October 2017 were retrospectively analyzed. The age, gender, smoking, TNM, NSE, NLR, chemotherapy cycle, radiotherapy, surgery and new metastasis of lymph nodes of 47 cases with distant metastasis and 47 cases without distant metastasis in 1 year were compared. Finally, factors influencing distant metastasis were determined as the predictors. The receiver operating characteristic (ROC) curve model was established based on logistic regression analysis of the factors obtained.
Results: Distant metastasis mainly involved brain (17/47), liver (17/47) and bone (17/47). Univariate analysis showed that patients with new lymph node metastasis, high NSE, pretreatment hilar lymph node metastasis and NLR were more prone to have distant metastasis. Multivariate analysis showed that new lymph node metastasis, high NSE, NLR and pretreatment hilar lymph node metastasis were independent predictors. The predictive model established using these predictors had an AUC of 0.872 (95%CI: 0.803-0.941), a sensitivity of 76.60% and a speciality of 80.85%.
Conclusion: The new lymph node metastasis, NLR and NSE are predictors of distant metastasis, and thus, may have a profound impact on treatment decision making. Patients with lower NLR and NSE expression levels and less new metastasis of lymph nodes have a lower distant metastasis rate.
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