- Presence of at least one measurable lesion that can be accurately measured in at least one dimension with longest diameter ≥20 mm using conventional techniques or ≥10 mm with spiral computed tomography (CT) scan (or otherwise at least twice the reconstruction interval for CT or magnetic resonance imaging [MRI] scans). Previously irradiated lesions may be considered to be measurable provided: *there has been documented progression of the lesion(s) since completion of radiotherapy; and *the criteria for measurability as outlined above are met.