Inclusion Criteria:

1. adult (> 18 years) male or female patient
2. patient has biopsy-proven NSCLC or lung metastasis
3. patient has been rejected for surgery and has been considered unfit for radiation therapy or chemotherapy
4. patient has as many as 3 tumors per lung, each 3.5 cm or smaller in greatest diameter, by CT scan
5. tumors are located at least 1 cm from trachea; main bronchi; esophagus; aorta; aortic arch branches; pulmonary artery; and heart
6. tumors are accessible by percutaneous route
7. patient has Eastern Cooperative Oncology Group (ECOG) performance status of 0, 1, or 2
8. patient has platelet count > 100 x 109 /L and international normalized ratio ≤ 1.5
9. patient has signed written informed consent prior to any study specific procedures.

Exclusion Criteria:

1. patient has undergone previous pneumonectomy
2. patient is considered at high-risk for RF ablation due to major co-morbid medical conditions
3. patient has more than 3 tumors / lung
4. patient has at least one tumor > 3.5 in greatest diameter
5. tumor is associated with atelectasis or obstructive pneumonitis
6. patient has renal failure requiring hemodialysis or peritoneal dialysis
7. patient has active clinically serious infection
8. patient has history of organ allograft
9. patient has history of substance abuse or any medical, psychological or social conditions that may interfere with his / her participation in the study or evaluation of the study results
10. patient is pregnant or breast-feeding
11. patient has ECOG performance status > 2
12. patient has platelet count ≤ 100 x 109 /L or international normalized ratio > 1.5.