response assessment
Systematic evaluation of tumor changes following treatment using standardized imaging criteria.
Full Definition
Response assessment is the systematic evaluation of tumor changes following anticancer treatment, using standardized imaging criteria to determine treatment efficacy. The process involves comparing baseline and follow-up imaging studies to categorize response as complete response, partial response, stable disease, or progressive disease. Various criteria exist including RECIST, immune-related response criteria, and organ-specific guidelines. Response assessment requires careful attention to measurement technique, timing of imaging, and recognition of treatment-related effects. Accurate response evaluation is crucial for clinical decision-making, patient counseling, and clinical trial endpoints.
Usage
Usage note: Specify the criteria used (RECIST, irRC, etc.) when reporting.
In Context
- "Response assessment at 12 weeks showed partial response with 40% reduction in target lesion size." — Clinical trial report
- "Immune-related response criteria were used for response assessment given the checkpoint inhibitor therapy." — Immunotherapy monitoring