. Cyfra 21-1 is a protein fragment primarily released from cells in the respiratory epithelium, particularly in the lungs.
. While Cyfra 21-1 is not a standalone screening test for lung cancer, it can aid in identifying individuals at high risk or those with symptoms that might indicate non-small cell lung cancer (NSCLC), when used alongside other tests and imaging e.g., ultrasound or CT scans. It may also be elevated in non-cancerous conditions such as chronic obstructive pulmonary disease (COPD), interstitial lung diseases, and some other cancers like bladder cancer.
. In cancers, this tumor marker is used as an aid in monitoring the recurrence/progression and in assessing the response to therapy.
Note: Cyfra 21-1 levels can vary between different manufacturers due to differences in assay methods and reagent specificity. Results obtained from different manufacturers cannot be used interchangeably.