PS and smoking status are independent prognostic factors for OS in NSCLC.

Japanese ethnicity when compared with Caucasian ethnicity and never-smoker status are independent favorable prognostic factors for OS in NSCLC.

Never-smokers with non-small cell lung cancer lived longer than ever-smokers. Gender, histology, and time of diagnosis are important factors for prognosis in these patients.

As a typical non-normal case, we consider a family of elliptically symmetric distributions. Then, the moment parameter and its consistent estimator are presented. Also, the asymptotic expectation and the asymptotic variance of the consistent estimator of the general moment parameter are given. Besides, the numerical results obtained by Monte Carlo simulation for some selected parameters are provided.

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