In two different controlled prospective randomized trials the Lung Cancer Study Group has shown that adjuvant CAP chemotherapy is effective in prolonging the disease-free survival. These studies indicate that the adjuvant chemotherapy has its effect by way of diminishing systemic recurrences and that the adjuvant therapy is more effective in non-squamous than in squamous disease. In addition, the benefit of the treatment is more apparent in patients with more advanced, though resectable, disease. It is also becoming clear that chemotherapy either alone or in combination with radiation therapy can result in relatively high response rates in patients with disease localized to the thorax. Indeed, many of these individuals can then undergo surgical resection. It remains to be determined, however, whether or not this preoperative therapy will be effective in prolonging survival. In the future it is quite likely that optimum therapy will involve the use of preoperative treatment either with chemotherapy alone or a combination of chemotherapy and radiation therapy, followed postoperatively with adjuvant chemotherapy with a non-cross resistant regimen. In addition, a major problem is brain recurrences. Indeed the brain was the most frequent site of first recurrence systemically in many of these studies. Thus, more effective therapy directed at CNS disease will have to be developed before major breakthroughs can be anticipated in the surgical adjuvant therapy of lung cancer.