How can I use Thermo Proteome Discoverer for quantitative proteomics (such as ICPL, iTRAQ and SILAC)? How you deal with the statistical criteria to answer the classical question from biological field about significance of fold changes, or better to say P value? Do we really need to perform any extra significance assessments on Proteome Discoverer data? How we could argue that Variability calculation behind the Proteome Discoverer software is enough to show biological significance in proteomics?