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Int Braz J Urol. 2012 Nov-Dec;38(6):739-49.

Downregulation of C3 and C4A/B complement factor fragments in plasma from patients with squamous cell carcinoma of the penis.

Author information

1
Laboratory of Applied Genetics, Hematology Service and Department of Urology, Brazilian National Cancer Institute, Praça da Cruz Vermelha 23, RJ, Brazil. ornellasa@hotmail.com

Abstract

PURPOSE:

To investigate the use of ClinProt technique to identify cancer markers in plasma of patients suffering from squamous cell carcinoma of the penis (SCCP).

MATERIALS AND METHODS:

Plasma of 36 healthy subjects and 25 patients with penile carcinoma who underwent surgical treatment between June 2010 and June 2011 was collected and analyzed by the ClinProt/MALDI/ToF technique. Then the peptides were identified from the C8 MB eluted fraction of patients' and control subjects' plasma by LIFT MS/MS.

RESULTS:

A cluster of 2 peptides (A=m/z 1897.22 ± 9 Da and B=m/z 2021.99 ± 9 Da) was able to discriminate patients from control subjects. Cross validation analysis using the whole casuistic showed 62.5 % and 86.76 % sensitivity and specificity, respectively. The cluster also showed very high sensitivity (100 %) and specificity (97%) for SCCP patients that died due to the disease. Furthermore, patients with lymph node involvement presented sensitivity and specificity of 80 % and 97 %, respectively. These two peptides were identified by the proteomic approach based on a MALDI-TOF/TOF as fragments of C3 (m/z 1896.17) and C4a/b (m/z 2021.26) complement proteins.

CONCLUSIONS:

The results showed that as the disease progresses, the fragments C3 and C4 A/B are less expressed in comparison with healthy subjects. These results may be useful as prognostic tools.

PMID:
23302412
[Indexed for MEDLINE]
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