Open Access
Colorectal cancer detection by means of optical fluoroscopy. A study on 494 subjects
Manuela Lualdi1,Luigi Battaglia1,Ambrogio Colombo1,Ermanno Leo1,Daniele Morelli1,Elia Poiasina1,Alberto Vannelli1,Renato Marchesini1
Medical Physics Unit, Fondazione IRCCS Istituto Nazionale Tumori, Milan, Italy.
DOI: 10.2741/E129 Volume 2 Issue 2, pp.694-700
Published: 01 January 2010
(This article belongs to the Special Issue Biochemical markers in biological fluids)

In the present work we investigated the possible role of the native fluorescence of blood plasma in the management of colorectal cancer (CRC) and its feasibility as a new tumor marker. Sample of blood was collected from 248 asymptomatic blood donors and from 246 CRC patients. The native fluorescence of blood plasma was measured using a conventional spectrofluorimeter. The intensity of fluorescence of blood plasma at 623 nm (IF623), reasonably ascribed to endogenous porphyrins, was significantly higher in CRC patients than in healthy subjects. The diagnostic capability of IF623 in the discrimination between healthy subjects and CRC patients was tested by Receiving Operating Characteristic (ROC) curve analysis, which resulted in an Area Under the Curve (AUC) of 0.72+/-0.01. Fluorescence measurement of blood plasma might be considered diagnostically useful as a candidate for a new tumor marker for CRC management. The procedure is characterised by a great acceptability and by a very low cost, and might be used in a two-step screening wherein an IF623 positive result is followed by colonoscopy.

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Manuela Lualdi, Luigi Battaglia, Ambrogio Colombo, Ermanno Leo, Daniele Morelli, Elia Poiasina, Alberto Vannelli, Renato Marchesini. Colorectal cancer detection by means of optical fluoroscopy. A study on 494 subjects. Frontiers in Bioscience-Elite. 2010. 2(2); 694-700.