Participants will be consented into the study after they are found to meet the study inclusion criteria. The clinical staff will schedule a tissue biopsy and a blood draw for the participant to give NGS(Next-generation Sequencing).One is according to the germline mutation data to screen susceptible gene in SCLC(Small Cell Lung Cancer); two is to explore the extensive consistency detection of blood and tissues in patients with SCLC gene mutation information; three is to conduct dynamic monitoring of blood ctDNA(circulating tumor DNA) in patients with SCLC during treatment, by changing the types of mutations / abundance (for example: the clonal evolution of typical samples analysis) and change of tumor load, , investigating the patients treatment effect , for the significant change of mutations, to study whether it can be used as molecular marker; four is to analyze of the molecular typing of SCLC, according to the clinical and pathological features of patients.