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Table 1 Response criteria by inverse Choi density/size

From: Giant cell tumor of bone following denosumab treatment: assessment of tumor response using various imaging modalities

Complete response

Disappearance of the disease

Partial response

A decrease in size (%Δ Choi SLD) ≥ 10% or an increase in CT density > 15% compared with baseline, no new lesions, and no obvious progression of non-measurable disease

Stable disease

Does not meet the criteria for CR, PR, or PD

Progressive disease

An increase in unidimensional tumor size (Choi SLD) ≥ 10% and does not meet the criteria for PR using CT density; any new lesions identified by CT/MRI; new intratumoral nodules or increase in the size of existing intratumoral nodules

Unevaluable

The CT/MRI exam is unavailable or deemed UE; if a target lesion is deemed UE by density and size measurement and the rules for PD do not apply, a response of CR, PR, or SD cannot be assigned for the time point and the response will be UE

  1. PR partial response, SLD sum of longest diameter, SD stable disease, PD progressive disease, UE unevaluable