Fibronectin concentration in ascites differentiates between malignant and nonmalignant ascites

Area of Science:

• Biochemistry
• Oncology
• Gastroenterology

Background:

• Distinguishing malignant from nonmalignant ascites using standard laboratory tests remains challenging.
• Existing methods show considerable overlap and limited accuracy in ascites diagnosis.
• There is a need for improved diagnostic markers for ascites differentiation.

Purpose of the Study:

• To evaluate the efficacy of fibronectin concentration in ascites fluid for differentiating malignant from nonmalignant ascites.
• To compare the diagnostic accuracy of fibronectin with other established laboratory parameters.
• To establish a reliable cutoff value for fibronectin in ascites for improved diagnosis.

Main Methods:

• Fibronectin concentration was measured in ascites fluid from 104 patients (34 malignant, 51 cirrhotic, 19 other).
• Initial analysis in 47 patients established mean values and a cutoff concentration (75 µg/ml).
• Simultaneous analysis of total protein, white cell count, lactic acid, LDH, and pH was performed.

Main Results:

• Fibronectin determination achieved 100% sensitivity and specificity for malignant ascites in a validation group of 57 patients.
• Across all 104 patients, fibronectin showed high diagnostic accuracy (97.1% specificity, 94.4% positive accuracy).
• Fibronectin outperformed other tested laboratory parameters, which had accuracy below 87%.

Conclusions:

• Fibronectin concentration in ascites is a highly accurate marker for differentiating malignant from nonmalignant ascites.
• This method offers superior diagnostic performance compared to traditional laboratory parameters.
• Fibronectin measurement, potentially combined with markers for infectious or pancreatic ascites, can significantly aid in differential diagnosis.