Fibulin-3

Fibulin-3 is a protein made by cells that helps hold tissue scaffolding together. In medicine, it is studied as a blood and pleural fluid biomarker that tends to be elevated in people with malignant pleural mesothelioma, the cancer most often caused by asbestos exposure. It is not a stand-alone diagnostic test, but abnormal levels can support a mesothelioma workup alongside imaging and biopsy.

Origin

The fibulin family of extracellular matrix proteins was named in the early 1990s from the Latin fibula ("clasp"), reflecting their role in linking structural tissue elements. Fibulin-3 (also called EFEMP1) was identified shortly thereafter, and its potential as a mesothelioma biomarker was reported by Pass and colleagues in a 2012 New England Journal of Medicine study.

Significance in Asbestos Context

For patients being evaluated for mesothelioma, Fibulin-3 is one of several blood or pleural fluid markers a doctor may order to help distinguish mesothelioma from benign causes of pleural disease such as scarring, infection, or asbestos-related effusions. It cannot confirm mesothelioma on its own (a tissue biopsy remains the gold standard), but elevated levels can prompt closer investigation and earlier referral to a specialist. In legal claims, Fibulin-3 results may appear in the medical record as part of the diagnostic story, supporting the timeline of when mesothelioma was suspected and confirmed.

Example Sentence

"After her pleural fluid showed elevated Fibulin-3 and mesothelin, her pulmonologist scheduled a thoracoscopic biopsy to confirm whether she had mesothelioma."

Related Terms

Mesothelin, SMRP, Malignant Pleural Mesothelioma, Biomarker, Pleural Effusion, Thoracoscopy

Notes

• Ask your doctor whether Fibulin-3, mesothelin (SMRP), or other biomarkers were tested, and request copies of the results for your records. These can be relevant to both treatment decisions and a legal claim.
• Fibulin-3 can be elevated in other conditions (including some non-mesothelioma cancers and benign pleural disease), so do not interpret a single value on your own; ask how it fits with your imaging and biopsy findings.
• A normal Fibulin-3 level does not rule out mesothelioma. If symptoms or imaging are suspicious, push for a tissue biopsy rather than relying on blood tests alone.
• Preserve all pathology reports, lab results, and pleural fluid analyses; your legal team will need the full diagnostic record to document when and how mesothelioma was identified.