Serum lncRNA AFAP1-AS1 could be used as molecular marker for distinguishing non-small cell lung cancer patients from healthy people, and high serum lncRNA AFAP1-AS1 expression levels correlated with distant metastasis, lymph node metastasis, poor clinical stage, and larger tumor size (Li W. et al., 2017). The gene discussed is AFAP1; the disease is non-small cell lung carcinoma.