Identification of Circulating Tumor Cells in the Peripheral Blood of Lung Cancer Patients (Old Title: Significance of CD44 and or Epithelial Specific Antigen Positive Cells in the Peripheral Blood of Lung Cancer Patients) (LUN0017)

Inclusion Criteria:

Inclusion Criteria:

Inclusion Criteria (Cases):

1. Advanced stage (IIIB with malignant effusion or IV) histologically or cytologically
confirmed NSCLC

2. Patients must be newly diagnosed (untreated) or have evidence of disease progression
at the time of sample collection

3. ability to sign informed consent

4. at least 18 years of age

Inclusion Criteria (Controls):

1. no known prior or active malignancy

2. ability to sign informed consent

3. at least 18 years of age Exclusion Criteria:1. history of any other cancer other than
non-melanoma skin cancer within the last 5 years

Exclusion Criteria:1. history of any other cancer other than non-melanoma skin cancer
within the last 5 years

2. pregnant women