 - Patients with bilateral pulmonary metastases from sarcomas, melanomas, germ cell tumors, or epithelial malignancies metastatic to the lungs, mediastinum, or pleura who can be rendered no clinical evidence of active disease NED or minimal residual disease MRD by standard of care metastasectomy where NED refers to diagnostic tests failing to detect presence of disease and MRD refers to low-volume, subclinical disease which is not amenable to standard of care biopsy for histologic confirmation and poses no immediate threat to patient health and would not otherwise warrant standard of care treatment but surveillance instead. 