Research of the EML4-ALK Gene Expression in the Pleural Effusion or Tumor Tissue From Lung Cancer Patients

Inclusion Criteria: * 20 or more than 20 years of age * The pathological diagnosis confirmed lung cancer * Patients have achieved pleural effusion, or surgical biopsy to obtain tumor tissue specimens * The patient had signed inform consent Exclusion Criteria: * pleural effusion or tumor tissue can not be obtained * the patient is not suitable to join the research according to the judgement by the investigator