A 40-year-old man, Vibhu presents with pulmonary lesions seen on chest CT scan. He has a history of melanoma which was treated with wide local excision with negative margins and lymph node dissection. Biopsy of these pulmonary lesions proves to be metastatic melanoma. General condition of the patient is good & there is no evidence of recurrence or extrathoracic disease. What is the most appropriate treatment for this patient?