Table 7.

Choi Criteria

Response	Criteria
CR	• Disappearance of all lesions • No new lesions
PR	• A decrease in tumor size ≥ 10 % or a decreased in tumor attenuation (Hounsfield unit) ≥ 15 % on CT • No new lesions • No obvious progression of non-measurable disease
PD	• An increase in tumor size ≥ 10 % and does not meet criteria of PR by tumor attenuation on CT • New lesions • New intratumoral nodules or increase in size of the existing intratumoral nodules
SD	• Does not meet criteria of CR, PR, or PD • No symptomatic deterioration resulted from tumor progression

CR complete response, PD progressive disease, PR partial response, SD stable disease