Inflammatory Marker Elevation in Malignancy

Diagnostic Accuracy and Sensitivity

• CRP tends to rise more quickly with inflammation and falls more quickly with resolution compared to ESR, making it more responsive to acute changes 1
• CRP has shown higher diagnostic accuracy compared to ESR and WBC count in detecting inflammation in various clinical scenarios 1
• CRP normalizes more quickly than ESR during resolution of inflammation, making it more useful for monitoring treatment response 2

Clinical Applications and Limitations

• Neither marker is sufficiently specific or sensitive when used alone as a diagnostic tool for malignancy, with a sensitivity not exceeding 0.85 1
• The degree of elevation of ESR and CRP may be discrepant in the same patient, suggesting they reflect different aspects of the inflammatory response 2

Recommendations for Clinical Practice

• Both markers should be used as complementary tests rather than alternatives when evaluating for possible malignancy, as recommended by the American College of Radiology 3