Table 2.

Summary of the RECIST 1.1 and Choi criteria for treatment response evaluation

Response	Definition
CT response evaluation criteria according to RECIST 1.1
CR	Disappearance of all lesions
	Reduction to <10 mm in short axis of any pathological lymph nodes (whether target or non-target)
	No new lesions
PR	At least a 30% decrease in SLD of target lesions, taking as reference the baseline SLD
	No new lesions
SD	Does not meet the criteria for CR, PR, or PD
PD	At least a 20% increase in SLD of target lesions, taking as reference the smallest sum on study and at least 5 mm absolute increase in SLD
	New lesions
Modified CT response evaluation criteria according to Choi
CR	Disappearance of all lesions
	No new lesions
PR	A decrease in sizea of ≥10% or a decrease in tumor density (HU) ≥15% on CT
	No new lesions
	No obvious progression of nonmeasurable disease
SD	Does not meet the criteria for CR, PR, or PD
	No symptomatic deterioration attributed to tumor progression
PD	An increase in tumor size of ≥10% and does not meet criteria of PR by tumor density (HU) on CT
	New lesions
	New intratumoral nodules or increase in the size of the existing intratumoral nodules

CR complete response, PR partial response, HU Hounsfield unit, CT computed tomography, SD stable disease, PD progression of disease, RECIST Response Evaluation Criteria in Solid Tumors

^a SLD The sum of longest diameters of target lesions as defined in RECIST