Response Evaluation Criteria in Solid Tumors (RECIST)

The Response Evaluation Criteria in Solid Tumors (RECIST) is a standardized system used by doctors to measure how well a cancer is responding to treatment. It involves taking precise measurements of tumor sizes using imaging scans like CT or MRI. Based on changes in these measurements, doctors categorize the response as complete disappearance of the tumor, reduction in size (partial response), no significant change (stable disease), or increase in size/signs of worsening (progressive disease). RECIST helps ensure consistent, objective assessment of treatment effectiveness across clinical trials and patient care.