RATIONALE: Classically the evaluation of response in lung cancer has been based in comparing pre & post treatment tumour volume by means of studying changes in the diameter of the selected target lesions by RECIST. The introduction of new targeted drugs creates the need of a different response assessment. Functional imaging techniques are able to study in vivo physiological processes of angiogenesis. Therefore, dynamic techniques may be more appropriate for assessing response to antiangiogenic drugs, whose mechanism of action is focused on tumor's vasculature normalization. Preliminary studies have demonstrated significant and very early changes in indirect vasculature parameters such as flow, blood volume and tumor perfusion with vascular-targeting agents. These techniques may be useful for selecting patients who are going to benefit from antiangiogenic therapy by an early evaluation of response by means of functional imaging method.