Performance status, pre-treatment level of serum hemoglobin, albumin, neutrophil-to-lymphocyte ratio, lymphocyte-to-monocyte ratio, clinical T stage, clinical T4b stage of airway involvement, clinical M1 stage of bone metastasis, liver cirrhosis, and frequency of multidisciplinary team conference were significantly associated with incomplete treatment in univariable analysis. This evidence concerns the gene ALB and cirrhosis of liver.