Identification of potential serum peptide biomarkers of biliary tract cancer using MALDI MS profiling

Neomal S Sandanayake, Stephane Camuzeaux, John Sinclair, Oleg Blyuss, Fausto Andreola, Michael H Chapman, George J Webster, Ross C Smith, John F Timms, Stephen P Pereira

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)


BACKGROUND: The aim of this discovery study was the identification of peptide serum biomarkers for detecting biliary tract cancer (BTC) using samples from healthy volunteers and benign cases of biliary disease as control groups. This work was based on the hypothesis that cancer-specific exopeptidases exist and that their activities in serum can generate cancer-predictive peptide fragments from circulating proteins during coagulation.

METHODS: This case control study used a semi-automated platform incorporating polypeptide extraction linked to matrix-assisted laser desorption/ionisation time-of-flight mass spectrometry (MALDI-TOF MS) to profile 92 patient serum samples. Predictive models were generated to test a validation serum set from BTC cases and healthy volunteers.

RESULTS: Several peptide peaks were found that could significantly differentiate BTC patients from healthy controls and benign biliary disease. A predictive model resulted in a sensitivity of 100% and a specificity of 93.8% in detecting BTC in the validation set, whilst another model gave a sensitivity of 79.5% and a specificity of 83.9% in discriminating BTC from benign biliary disease samples in the training set. Discriminatory peaks were identified by tandem MS as fragments of abundant clotting proteins.

CONCLUSIONS: Serum MALDI MS peptide signatures can accurately discriminate patients with BTC from healthy volunteers.

Original languageEnglish
Pages (from-to)7
JournalJournal of Clinical Pathology
Issue number1
Publication statusPublished - 4 Feb 2014


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