Algorithms|Biomarkers, Tumor|Biomedical Engineering|Complex Mixtures|Computer Simulation|Gene Expression Profiling|Humans|Models, Biological|Models, Chemical|Neoplasm Proteins|Pancreatic Neoplasms|Pattern Recognition, Automated|Proteome|Reproducibility of Results|Sensitivity and Specificity|Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization