Table 3. Criteria for response assessment.

Response	Definition
CR	Resolution of all clinical and radiological abnormalities detected at presentation
PR	>50% resolution of all disease determined by product of two diameters
Non-progressive PR	No further reduction in previously responding disease
Progressive PR	Further reduction in previously responding disease
Nonresponse	<50% response subdivided into: (i) progressive disease if >50% increase in disease volume or development of new lesions; (ii)stable disease if disease status insufficient to meet criteria of partial response or progressive disease